The ms = 0.5645 and mk=0.1113 for a 30 N box on level ground. What level force is needed to start the box moving

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)

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

Natural gas is used for cooking and heating and it is a fossil fuel.

Natural gas is the most used energy sorces in homes

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.

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.

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)

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.

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.

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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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. ^^

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.

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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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

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.

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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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

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]

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:

participating only in cardiovascular exercises

Participating only in cardiovascular exercises is not a recommended change in physical activity for aging individuals.

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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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.

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.

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.

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.

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

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.

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.

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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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.

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

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.

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

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.

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