Answer:
1385 N/m^2
Explanation:
The pressure exerted by the brick on the ground is given by:
[tex]p=\frac{F}{A}[/tex]
where F is the weight of the brick and A is the area of its largest face.
The area of the largest face is given by the two largest sides of the brick, therefore:
[tex]A=(0.19 m)(0.095 m)=0.01805 m^2[/tex]
The force exerted by the brick is the weight:
[tex]F=25 N[/tex]
So, the pressure is
[tex]p=\frac{25 N}{0.01805 m^2}=1385 N/m^2[/tex]
The pressure exerted by the brick when resting on its largest face is calculated by dividing the weight of the brick (25 N) by the area of the largest face (0.01805 [tex]m^2[/tex]), resulting in a pressure of 1385 [tex]N/m^2[/tex].
The question seeks to calculate the pressure exerted by a brick on the ground when it is resting on its largest face. To find the pressure, we use the formula Pressure (P) = Force (F) / Area (A). Here, the force is the weight of the brick, which is given as 25 N.
Since pressure is force per unit area, we need to identify the area of the largest face of the brick. The dimensions of the brick are 0.19 m, 0.07 m, and 0.095 m. The largest face would be the one formed by the sides measuring 0.19 m and 0.095 m. Thus, the area is A = 0.19 m × 0.095 m = 0.01805 [tex]m^2[/tex].
To calculate the pressure, we divide the force (weight) by the area:
P = F / A = 25 N / 0.01805 m2 = 1385 [tex]N/m^2[/tex]
Therefore, the pressure exerted on the ground by the brick resting on its largest face is 1385 [tex]N/m^2[/tex].
A car is pulled with a force of 10,000 N. The car's mass is 1267 kg. But, the car covers 394.6 m in 15 seconds
[a]What is the expected acceleration of the car from 10,000 N force?
[b]What is the actual acceleration from the observed data of x and t?
[c]What is the difference in accelerations?
[d]What force caused this difference?
[e]What is the magnitude and direction of the force that caused the difference in acceleration?
F=m*a=>a=F/m=10000/1267=7.89 m/s²
d=v₀t+a't²/2<=>394.6=112.5*a'=>a'=3.5
a-a'=7.89-3.5=4.39 m/s²
This difference causes friction forces
We apply the second principle of dynamics: vector: F + N + G + Ff = ma (vector vectors, I can not here)
Scalar: Ox: F-Ff = ma
Oy N-mg = 0
Ff = -ma+ F =-1267*7.89+10000=-8869+10000=1131 N
This frictional force (Ff) is opposite to the traction (F)
How are analog and digital signals similar? Check all that apply.
Both reduce noise.
Both pick up noise. Both make noise louder.
Both transmit data or information.
Both get weaker when traveling long distances.
Answer:
Both transmit data or information.
Both get weaker when traveling long distances.
Answer:
Both transmit data or information.
Both get weaker when traveling long distances.
Explanation:
Just did it on Ed. ^^
the change in momentum experienced by a object is equivalent to the...
a. objects kinetic energy.
b.force acting on the object.
c. impulse acting on the object.
d. objects potential energy.
e. objects velocity.
Answer: C (impulse acting on the object)
The momentum is defined as it is the impulse acting on the force . Change in momentum is known as Impulse. Impulse is used to increase or decrease the momentum of object.
From Newtons II law
F = m. a
= m. v/t since a = rate of change of velocity.
F . t = m . v
F . t is known as impulse momentum
what force is required to accelerate a 10 kg mass at 5m/sec^2
Given Data
Acceleration (a) = 5 m/s²
mass ( m) = 5 Kg
From Newtons II law, We know that
F = m. a
F = 10 × 5
= 50 N
50 N force is required to accerate the mass
An Aluminium bar is 3.25m long and has a diameter of 25mm. If the temperature difference between the ends is 250°C, find the rate of heat transfer along the bar. (Where the Thermal conductivity for Al is 205W/m°C)
is it 5.67 W, 7.74 W, or 10.5 W?
Answer
7.74 W
Explanation
The formula for getting the the rate of heat transfer is:
[tex]\frac{Q}{T}[/tex]=[tex]\frac{KA(T2 - T1) }{d}[/tex]
A = πr² = π×(12.5/1000)²
= 4.908×10⁻⁴m²
Rate of heat transfer = [tex]\frac{205*4.908×10⁻⁴*250}{3.25}[/tex]
= 7.74 W
a toy car moves around a loop-the-loop track.The loop is 0.5 high.What is the minimum speed of the car at the top of the loop for it to stay on track?
Answer:
The speed of the car at the apex of the loop must be grater than 2.45 m/s
Explanation:
In order for the car to not fall off the track at the apex of the loop, the norm force of the track at the apex must be greater than zero.
Assuming frictionless life on the track which is also to have a perfectly circular shape near the top (radius being 0.25m), the norm force of the track and gravity both point down and result in the centripetal force:
[tex]F_c=F_N+F_g[/tex]
The formula for centripetal force on a circular trajectory is
[tex]F_c = m\frac{v^2}{r}[/tex]
and so the condition for the car to stay on the track can be written as
[tex]m\frac{v^2}{r} = F_N + mg\implies F_N = m\frac{v^2}{r}-mg>0\\\implies |v| >\sqrt{gr}=\sqrt{9.8\frac{m}{s^2}0.25m}=2.45\frac{m}{s}[/tex]
The speed of the car at the apex of the loop must be grater than 2.45 m/s
The minimum speed of the car at the top of the loop for it to stay on track be 1.57 m/s.
What is centripetal acceleration?Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center. In your daily existence, you must have encountered numerous instances of centripetal acceleration. A centripetal acceleration occurs when you drive in a circle, and a centripetal acceleration also occurs when a satellite orbits the earth. Centripetal refers to being in the center.
Given parameters:
Height of the loop: h = 0.5 m.
Radius of the loop be: r = h/2 = 0.25 m.
If the mass of the toy car be m, total force acting on the top of the loop be:
F = mv²/r -mg
For the minimum speed of the car at the top of the loop for it to stay on track: F = 0
⇒ mv²/r -mg = 0
⇒ v = √(gr) = √(9.8×0.25) m/s = 1.57 m/s.
Hence, the minimum speed of the car at the top of the loop for it to stay on track be 1.57 m/s.
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A boat takes 3.0 hours to travel 50 km down a river, then 5.4 hours to return. Determine the speed of the water in the river.
Answer:
3.7 km/h
Explanation:
Let's call v the proper speed of the boat and v' the speed of the water in the river.
When the boat travels in the direction of the current, the speed of the boat is:
v + v'
And it covers 50 km in 3 h, so we can write
[tex]v+v' = \frac{50 km}{3 h}=16.7 km/h[/tex] (1)
When the boat travels in the opposite direction, the speed of the boat is
v - v'
And it covers 50 km in 5.4 h, so
[tex]v-v'=\frac{50 km}{5.4 h}=9.3 km/h[/tex] (2)
So we have a system of two equations: by solving them simultaneously, we find the value of v and v':
[tex]v+v'=16.7 \\v-v'=9.3[/tex]
Subtracting the second equation from the first one we get:
[tex](v+v')-(v-v')=16.7-9.3\\2v'=7.4\\v'=3.7[/tex]
So, the speed of the water is 3.7 km/h.
how much work does a 30W engine do if it operates for 40 seconds
Given that :
Power (P) = 30 W ,
time (t) = 40 s,
Work = ?
we know that, power is defined as rate of doing work
Power = Work ÷ time
=> Work = Power × time
= 30 × 40
W = 1200 J
Which layer in the atmosphere contains the most water vapor and gases? A. thermosphere B. stratosphere C. mesosphere D. troposphere
D. Troposphere
The layer of the atmosphere that is above the troposphere and in which temperature increases as altitude increases. This atmospheric layer contains the ozone layer. The layer closest to Earth, where almost all weather occurs. It contains the gases water vapor, oxygen, nitrogen, and carbon dioxide.
Troposphere layer in the atmosphere contains the most water vapor and gases. Hence, option (D) is correct.
What is atmosphere?The atmosphere is a key component of Earth's interconnected physical systems. The layers of gases that surround a planet or other celestial body form the atmosphere.
The Earth's atmosphere is made up of 78% nitrogen, 21% oxygen, and 1% other gases. These gases are found in the atmospheric layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere), which are distinguished by distinct characteristics such as temperature and pressure.
The atmosphere shields life on Earth from incoming ultraviolet (UV) radiation, keeps the planet warm through insulation, and prevents temperature extremes between day and night. The sun heats the layers of the atmosphere, causing convection, which drives air movement and weather patterns all over the world.
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Compare solids, liquids, and gases in terms of their shape and volumes.
The two waves shown here are the same distance from point x and are traveling toward each other
What is the amplitude of the resulting wave when the two waves meet at point x
A). 0.0 cm
B) 1.0 cm
C) 2.0 cm
D) 4.0 cm
The Answer should be A: 0.0
Answer:
A). 0.0 cm
Explanation:
When two waves travel and meet at the same point, a phenomenon known as interference occurs.
The two extreme cases of interference are the following:
- When two waves in phase meet at the same point, the resultant wave produced by the interference has amplitude which is the sum of the amplitude of the individual waves
- When two waves in anti-phase meet at the same point, the resultant wave produced by the interference has amplitude which is the difference between the amplitudes of the individual waves
In this problem, we have two waves of amplitde A1 = 2.0 cm and A2 = 2.0 cm that meet at X in anti-phase (because they have opposite displacement): therefore, it is a destructive interference, and the resultant amplitude will be
[tex]A=A_1 -A_2 = 2.0 cm - 2.0 cm = 0.0 cm[/tex]
Bo learns about the law of inertia.
It states that objects at rest tend to stay at rest, and objects in motion tend to stay in motion the state of motion changes only when another force acts on an object. Bo wants to use this law to predict how a soccer ball will roll on the grass after he kicks it. which statement BEST describes the motion of the ball
(Answer choices in picture)
After Bo kicks the ball originately at rest. It changes because it has been acted upon. The ball will roll because of the kick. The friction between the ball and the grass will eventually get it to stop. The answer is A.
According to the law of inertia, a soccer ball will continue moving in the same direction and at the same speed it was initially kicked until the frictional force from the grass causes it to stop.
Explanation:The concept Bo is learning about, inertia, is the principle in physics that an object will maintain its motion, whether that be at rest or in movement, unless an external force causes it to change. In the context of the soccer ball, once Bo kicks it, the ball will move in the same direction and at the same speed it was initially propelled with. However, the surface it is rolling on (the grass) introduces friction, which is the force that gradually slows the ball's motion down. Overcoming this resistance requires energy. As the ball loses energy due to the friction from the grass, it will eventually come to a stop. Therefore, according to the law of inertia, the ball will continue moving until the frictional force from the grass causes it to stop moving.
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Bo learns about the law of inertia.
It states that objects at rest tend to stay at rest, and objects in motion tend to stay in motion the state of motion changes only when another force acts on an object. Bo wants to use this law to predict how a soccer ball will roll on the grass after he kicks it. which statement BEST describes the motion of the ball
(Answer choices in picture)
Which of the following factors determines the strength of the frictional force between two surfaces?
The amount of heat generated by the frictional
The types of surfaces involved
The objects' sizes
How hard the surfaces push together
Answer:
option 2 and 4
Explanation:
The strength of frictional force depends on the types of forces involved and how hard the surfaces push together.
If the surfaces are rough, then the frictional force between two surfaces is more and if the surfaces are smooth, the frictional force between two surfaces is less.
If they push hard, it means the weight on the surface is more and thus, the normal reaction force is more.
Friction force is directly proportional to the normal reaction force, so, the friction force depends on the push.
You are an astronaut in space far away from any gravitational field, and you throw a rock as hard as you can. The rock will: slowly slow down and stop continue at the same speed forever continue to accelerate at the rate it was when it left your hand
the answer to that question is the second option
Drawing from Newton's first law of motion, a rock thrown in space, distant from any significant gravitational field, would continue at the same speed in perpetuity.
Explanation:
In the context of Physics, and in particular Newton's first law of motion, the rock you throw in space, far from any gravitational field, will continue at the same speed forever. This law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. In space, far from any significant gravitational field, there are essentially no external forces to slow the rock down or change its direction, so it will keep moving at the speed it had when it left your hand.
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which fossil fuel is mostly used for heating and cooking
Natural gas is used for cooking and heating and it is a fossil fuel.
Natural gas is the most used energy sorces in homes
A person standing at the edge of a merry-go-round must hold on tightly to keep from flying off the edge as it speeds up. What name is given to the force that keeps the person moving in a circular path?
Answer:
The force in this setting is called centripetal.
Explanation:
While the centripetal force acts in the direction pointing toward the center of the curvature (in this case the center of the merry-go-around), the foce opposing it is referred to as centrifugal.
Answer:
Centripetal force
Explanation:
(Tennis)
Match the terms to their definition.
A ) ace
a stroke done to the right-front of the body (for right-handers), with the racket in a normal position (palm of hand facing opponent)
B ) backhand stroke
position facing the net. Used to begin most tennis strokes
C ) endurance
a tennis stroke made across the body with the back of the hand facing the direction of the stroke
D ) fault
exercising to increase stamina; mostly associated with aerobic activities and cardiovascular health
E ) flexibility
the way the game begins. Governed by a specific set of rules
F ) forehand stroke
a tennis stroke that creates a backspin on the ball
G ) let
is the absolute range of movement in a joint or series of joints and muscles
H ) rally
forward spin (usually of a moving ball) that is imparted by an upward stroke
I ) ready position
a sequence of shots within a point
J ) service
to exert force on an object using muscles
K ) slice
a service winner; the opponent cannot return the serve
L ) strength
when the service hits the net and lands in a let is played and the server gets another ball
M ) topspin
when the ball does not land in the service box
The density of an object is .835 g/cm3. If its volume is 34 cm3, what is the mass of the object?
D = m/v
Given:
D: .835 g/cm3
V: 34 cm3
M: ?
M= Dxv
M= .835 g/cm3 x 34 cm3
M= 28.39 g
Answer:
28.39
Explanation:
yes I did the math to
28) Q: A: You are sitting in a car that isn't moving; suddenly, the car quickly accelerates. Your body seems to be pushed back against the seat. Which word best explains why your body seemed to be pushed backward against the seat?
the seat is moving with the car and pushing you to keep up with the car or else the seat breaks and you go flying backwards until something stops you .... ouch.
You feel pushed back against the seat, but it's the seat pushing you forward.
Answer:
Inertia.
Explanation:
The first law of Newton states that a body will remain in the same state of motion ( relative rest or uniform movement) if there is no force applied to it.
Why will the body remain in the same state of motion? This is because of inertia.
Inertia is the property of bodies that tries to keep them in a state of motion.
In the case that the car suddenly moves, your inertia tries to keep you in a relative rest to the ground, that's why your body feels like being pushed back.
How is physical change different from a chemical change?
Hello there!
Physical changes do not change what a substance is, whereas a chemical change results in a new substance being formed, so they do change what a substance is.
I hope I could help you to solve this question. Have a great rest of your day! :)
Physical change involves a change in the form but not in the composition of a substance, such as melting wax. Chemical change, on the other hand, results in a new type of matter, which is observed in reactions like rusting or combustion. They both might involve the emission or absorption of heat.
Explanation:The difference between physical change and chemical change lies in the alteration of the original composition of matter. In a physical change, such as boiling or melting, the composition remains the same even though the state or form may change. For instance, when wax is heated and turns into liquid, it is a physical change because no new matter is formed.
On the other hand, a chemical change involves a transformation in the original matter's structure, leading to a new type of matter. This is observed in processes like rusting of iron or combustion burning. For example, when nitroglycerin explodes, it results in gases that are different from the original matter.
Moreover, chemical and physical changes may involve the release or absorption of heat. The combustion of an oxyacetylene torch is an exothermic process releasing heat, while the use of a cold pack for treating muscle strains is an endothermic process absorbing heat.
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what is the final volume of a gas with an initial volume of 200 .0ml if the pressure decreases from 500.0 kpa to 250.0 kpa
Answer:
Given Data:
V2 ?
V1 = 200 ml,
P1 = 500kpa and P2 = 2500kpa
From Boyels law (Ideal gas law) Where temperature remains constant, Pressure is inversely proportional to volume.
P1 .V1 = P2 . V2 ; T=Constant
V2 = (P1.V1) ÷ P2
= (500×200) ÷(250)
= 400 ml
The final volume of the gas is 400 ml.
Note: Increased pressure decreases the volume or decreased pressure increase the volume as they are inversely proportional. Here in our answer pressure decreases from 500 kpa to 250 kpa so volume increases from 200 ml to 400 ml.
Using Boyle's Law, the final volume of a gas with an initial volume of 200.0 mL and an initial pressure of 500.0 kPa decreases to 250.0 kPa is calculated by rearranging the equation P₁V₁ = P₂V₂ to solve for the final volume, resulting in a final volume of 400.0 mL.
Find the final volume of a gas following a decrease in pressure, given the initial volume and the initial and final pressures. To solve this problem, we use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when temperature and the amount of gas remain constant. The equation derived from this law is P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, respectively, and P₂ and V₂ are the final pressure and volume.
To find the final volume (V₂), we rearrange the equation to V₂ = (P₁V₁)/P₂. Substituting the given values into the equation, we have:
V₂ = (500.0 kPa × 200.0 mL) / 250.0 kPa
V₂ = (100000.0 kPamL) / 250.0 kPa
V₂ = 400.0 mL
Therefore, the final volume of the gas is 400.0 mL.
a bowling boal has a mass of 5 kg. what happens to its momentum when its speed increase from 1 m/s to 2 m/s?
Answer:
change in momentum (p) = m. (v₂ -v1)
= 5. (2-1)
momentum = 5 m/s.
Answer:
Momentum also increases (doubles from 5 kgm/s to 10 kgm/s)
Explanation:
the momentum is given by
[tex]p=mv[/tex]
where [tex]p[/tex] is momentum, [tex]m[/tex] is mass of thebowling ball ([tex]m=5kg[/tex]), and [tex]v[/tex] is speed.
The momentum when [tex]v=1m/s[/tex] is:
[tex]p=(5kg)(1m/s)\\p=5kgm/s[/tex]
and the momentum when [tex]v=2m/s[/tex] is:
[tex]p=(5kg)(2m/s)\\p=10kgm/s[/tex]
so we can see that the momentum doubles from 5 kgm/s to 10 kgm/s.
Which of the following is NOT a recommended change in physical activity for aging individuals? A. taking a longer time to warm up and cool down B. being cautious about exercising in extreme conditions C. using less weight, but adding repetitions D. participating only in cardiovascular exercises Please select the best answer from the choices provided. A B C D
participating only in cardiovascular exercises
Participating only in cardiovascular exercises is not a recommended change in physical activity for aging individuals.
What is Cardiovascular exercise?This is the type of physical activity which stresses the cardiorespiratory system.
It is however not ideal for aging individuals due to their weak body system which is why option D was chosen.
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Which of the following types of stars is most likely to end up as a red supergiant?
A
B
C
D
Answer:
Option D
Explanation:
Red Super giants are the biggest stars in our universe and are formed when the inner core of a star does not have its fuel which is hydrogen. The outer layer starts to do fission and thus become very hot.
As per the given graph, the wavelength is increasing in option D thus radiating more energy and heat. Wavelength of red color lies in range given in last graph.
Help me with theses 2 questions please.
1. Describe a situation in which an object gains the same amount of GPE(gravitational potential energy) when two different paths are taken to the same point. Explain (using requirements of work) why this is.
2. Explain what equilibrium and spring constant mean in relation to elastic potential energy.
Thanks if you can help with this.
1)
Answer: A inclined plane and staircase reaching the same height. Work depends on initial and final position only.
Explanation:
The amount of work done does not depend on path length. It depends on initial and final position. It is given by gravitational potential energy.
W = m g h
Where, m is the mass of the object, g is the acceleration due to gravity and h is the height.
Let the mass of the object be m. Two different paths ( one inclines plane and another staircase) are taken to same point. The object would gain same gravitational potential energy because it depends on the height through which the object is taken and not the actual path length.
W ∝ h.
2)
Spring constant can be defined as the ratio of amount of force acting spring with the displacement caused due to the force. A deformed elastic object has elastic potential energy stored in it which is equal to the work done to deform the object. It is proportional to the spring constant and amount of stretched distance.
Equilibrium is reached when the net force acting on the spring is zero. In equilibrium state, the object has natural extension. An object is said to possess elastic potential energy when force is applied and object deforms relative to original equilibrium shape or length.
What sequence shows electromagnetic waves arranged from shorter to longer wavelengths ?
A. Visible light , infrared radiation, microwaves,and ultra violet rays
B. infrared radiation, Visible light, ultra violet radiation, and microwaves
C. Microwaves, infrared radiation, Visible light , and ultra violet radiation
D. ultra violet radiation,visible light , infrared radiation, and microwaves
so from what i was looking at i think the answer is d because The shorter the wavelength, the higher measure of vitality it produces.So the request is D. Bright beams, Visible light, Infrared, and Microwaves.
Astronauts often undergo special training in which they are subjected to extremely high centripetal accelerations. One device has a radius of 15 m and can accelerate a person at 98 m/s2. What is the speed of the astronaut in this device?
Answer:
Speed of astronaut = 38.34 m/s
Explanation:
Centripetal acceleration is given by the expression, [tex]a=\frac{v^2}{r}[/tex], where v is the velocity and r is the radius.
Here centripetal acceleration is given, radius is given, we need to find velocity.
Centripetal acceleration = 98 m/s²
Radius = 15 m.
We have,
[tex]a=\frac{v^2}{r} \\ \\ 98=\frac{v^2}{15} \\ \\ v=38.34m/s[/tex]
Speed of astronaut = 38.34 m/s
Someone who appears to be lacking in intelligence according to intelligence testing scores but seems to excel in other domains is said to have
Someone who appears to be lacking in intelligence according to intelligence testing scores but seems to excel in other domains is said to have SAVANT SYNDROME
Answer:
Someone who appears to be lacking in intelligence according to intelligence testing scores but seems to excel in other domains is said to have SAVANT SYNDROME
Explanation:
Savant Syndrome is a set of anomalous cognitive symptoms where people suffer from a major left hemisphere disability; however, they can perform surprisingly well some tasks that involve the right hemisphere. People with savant syndrome develop talents, that is, extraordinary abilities in particular, concrete and peculiar.
In other words, according to this syndrome, some people with mental disorders and despite their physical, mental or motor disabilities, possess a surprising ability or specific mental abilities. That is, it is a condition in which a person with a mental disorder (such as an autism spectrum disorder) demonstrates a deep and prodigious ability or ability, far superior to what would be considered normal.
People with Savant Syndrome may have neurodevelopmental disorders (especially autism spectrum disorders) or brain injuries.
The most common abilities of the Savant are centered in Art (music, painting and sculpture), Calculation of dates, Mathematical calculation and mechanical and spatial skills.
Which could cause a satellite to descend low enough that it burns up in the Earths atmosphere?
A. Centripetal force
B. Air resistance
C. Gravitational force
Answer:
B. Air resistance
Explanation:
If the distance at which the satellite orbits is not enough to avoid the atmospheric drag, it will be affected by the friction of the Earth's atmosphere and the drag will slow down the speed of the satellite. Therefore, It will result in the reduction in the altitude of a satellite's orbit and eventually burn.
Which of the following is an example of acceleration? Select one: a. A boy walks two miles in one hour. b. A girl walks two miles per hour north for three hours. c. A boy walks two meters north, turns west, and walks another two meters. d. A girl drives a total distance of 240 miles in just under four hours.
The answer is option C .Because as the direction of the boy changes ;velocity changes .
Answer
Correct answer is option C .
Explanation:
Option A cannot be correct option because in this case only distance traveled and time is given we are not sure whether velocity is changing or not.
Option B
In this case girl travel with constant velocity so it cannot be accelerated motion
Option C
Correct option is C. Because as the direction of the boy changes that time velocity changes and rate of change of velocity with respect to time is known as acceleration
Option D
In this case also only distance and time is given we cant say whether it is accelerated motion or not