True
A scientific law only states that an event occurs.
Hope this helps!
Give an order-of-magnitude estimate for the time in seconds of a year
Which body exerts the force that propels the sprinter, the blocks or the sprinter?
If a flea can jump straight up to a height of 21.1 cm , what is its initial speed as it leaves the ground, neglecting air resistance?
Answer:
Initial speed, u = 2.03 m/s
Explanation:
Flea jumps to a height of, h = 21.1 cm = 0.211 m
As it leaves the ground, its final speed, v = 0
Acceleration, a = -g
Let u is the initial speed of the flea. It can be calculated as :
[tex]v^2-u^2=2as[/tex]
[tex]-u^2=2\times (-9.8)\times 0.211[/tex]
u = 2.03 m/s
So, the initial speed of the flea as it leaves the ground is 2.03 m/s. Hence, this is the required solution.
A fugitive tries to hop on a freight train traveling at a constant speed of 4.5 m/s. Just as an empty box car passes him, the fugitive starts from rest and accelerates at a = 3.6 m/s2 to his maximum speed of 8.0 m/s.
The impact of the type of material of which the slope is made on acceleration
The impact of the material type with which the slope is made affects the acceleration. Acceleration will be higher and smoother if the material of the slope surface is smoother as opposed to a texture which is not smooth. Smoother surface allows more acceleration because it will have less friction and resistance. Otherwise the friction will slow the object down for example a grassy ground will have more friction than a well maintained marble floor.
Astronomers have discovered several volcanoes on io, a moon of jupiter. one of them, named loki, ejects lava to a maximum height of 2.00 â 105 m. suppose another volcano on a different moon ejected lava at a height of 1.89 â 105 m where the acceleration of gravity is 1.72 m/s2.
Final answer:
The question deals with the heights of volcanic lava ejections on moons within our solar system under varying gravitational conditions, highlighting Io, a moon of Jupiter. It emphasizes physics concepts like kinematics and gravitational force, and underlines the contribution of space exploration to our understanding of celestial phenomena.
Explanation:
The question explores the phenomenon of volcanic eruptions on moons in our solar system, focusing on Io, one of Jupiter's moons, and another hypothetical moon. Specifically, it mentions volcanoes ejecting lava to great heights under different gravitational conditions. The question implicitly asks for an analysis or comparison based on the given data, such as the maximum height of lava ejection and the acceleration due to gravity on another moon.
The subject matter delves into the principles of kinematics and gravitational force, which are fundamental concepts in physics. It exemplifies how extraterrestrial volcanism can offer insights into the geological and physical dynamics of celestial bodies other than Earth. Furthermore, the mention of Galileo and Voyager spacecrafts underlines the importance of space exploration in understanding these phenomena.
I need help with this Physics problem. I've been stuck forever:
Two packages at UPS start sliding down the 18° ramp. Package A has a mass of 5.08 kg and a coefficient of friction of 0.18. Package B has a mass of 10.74 kg and a coefficient of friction of 0.13. How long does it take package A to reach the bottom? (s=2.08 m)
Thanks!
To find the time it takes for Package A to reach the bottom, we need to consider the forces acting on it. The main forces are the gravitational force and the frictional force. By calculating these forces and using Newton's second law and the equation for displacement, we can find the time it takes for Package A to reach the bottom of the ramp.
Explanation:To find the time it takes for Package A to reach the bottom of the ramp, we need to consider the forces acting on it. The two main forces are the gravitational force pulling it down the ramp and the frictional force opposing its motion.
First, let's calculate the gravitational force acting on Package A. The gravitational force is given by the formula Fg = m × g, where m is the mass of the object and g is the acceleration due to gravity. Given that the mass of Package A is 5.08 kg and the acceleration due to gravity is 9.8 m/s², we can calculate Fg = 5.08 kg × 9.8 m/s² = 49.784 N.
The frictional force can be calculated using the formula Ff = μ × Fn, where μ is the coefficient of friction and Fn is the normal force. The normal force can be calculated using the formula Fn = mg × cos(θ), where θ is the angle of the ramp. Given that θ is 18° and g is 9.8 m/s², we can calculate Fn = 5.08 kg × 9.8 m/s² × cos(18°) = 48.583 N. Now we can calculate the frictional force Ff = 0.18 × 48.583 N = 8.745 N.
The net force acting on Package A is the difference between the gravitational force and the frictional force. Fnet = Fg - Ff = 49.784 N - 8.745 N = 41.039 N. We can use Newton's second law, Fnet = ma, to find the acceleration of Package A. Given that the mass of Package A is 5.08 kg, we have 41.039 N = 5.08 kg × a. Solving for a, we find a = 8.08 m/s².
Finally, we can use the equation s = ut + (1/2)at² to find the time it takes for Package A to reach the bottom, where u is the initial velocity (which is 0 in this case) and s is the distance traveled. Given that s = 2.08 m and a = 8.08 m/s², we have 2.08 m = 0 + (1/2) × 8.08 m/s² × t². Solving for t, we find t ≈ 0.32 s.
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A vw beetle goes from 0 to 60 mi/h with an acceleration of 2.35 m/s^2.
a.how much time does ti take for the beetle to reach 60 mi/h?
b.a top - fuel dragster can go from 0 to 60 mi/h in 0.600 seconds. find the acceleration (m/s^2) of the dragster.
Select the correct statement to describe when a sample of liquid water vaporizes into water vapor. Question 12 options: Temperature increases and molecular motion increases while shape becomes less defined. Temperature increases and molecular motion decreases while shape becomes more defined. Temperature decreases and molecular motion decreases while shape becomes more defined. Temperature decreases and molecular motion increases while shape becomes less defined.
A runner runs 4875 ft in 6.85 minutes. what is the runnerâs average speed in miles per hour?
If you could live on the moon through one lunar cycle, how you would experience the phases of the moon?
An object is lifted to a certain height and then dropped. During the drop, which of the following is increased?
a) gravitational potential energy
b) kinetic energy
c) total mechanical energy
d) B and C
What is the uncertainty of the position of the bacterium? express your answer with the appropriate units?
In a video game, a ball moving at 0.6 meter/second collides with a wall. After the collision, the velocity of the ball changed to -0.4 meter/second. The collision takes 0.2 seconds to occur. What’s the acceleration of the ball during the collision?
Work is the transfer of _______ that occurs when a force makes an object move.
Vector c has a magnitude 24.6 m and is in the direction of the negative y-axis. vectors a and b are at angles α = 41.4° and β = 27.7° up from the x-axis respectively. if the vector sum a b c = 0, what are the magnitudes of a and b?
To find the magnitudes of vectors a and b, we need to resolve them into their x and y-components and equate them to zero to form two equations. Solving these equations will give us the magnitudes of a and b.
Explanation:To find the magnitudes of vectors a and b, we need to analyze the given vector sum equation a + b + c = 0. Since vector c is in the negative y-axis direction, it can be written as c = 0î - 24.6ĵ m. According to the vector sum equation, the x-components and y-components of the vectors should cancel out each other. Using trigonometric identities, we can resolve vectors a and b into their x and y-components:
a = (ax)î + (ay)ĵ
b = (bx)î + (by)ĵ
After resolving the vectors, we equate their x-components and y-components to zero to form two separate equations. Solving these equations will give us the magnitudes of vectors a and b.
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Water is sold on half-liter bottles. What is the mass, in kg and in g, of the water in such a full bottle?
∵ 1 litre is considered to be 1 kg or 1000 g
∴ half-liter i.e., 1/2 litre should equal to 1/2 kg and 1000/2 g = 500 g
Can the liquid be measured in kg?
Liquids are also measured in kg, but liquids such as gasoline and diesel are supplied in bulk and it is easier to measure the volume dispensed when it is dispensed, so they are measured in litres.
What is the relationship between liter and kilogram?
A liter of water has a mass of almost exactly one kilogram when measured at its maximum density, which occurs at about 4°C. It therefore follows that one thousandth of a liter, called a milliliter (1 ml), of water has a mass of about 1 g; 1000 liters of water have a mass of about 1000 kg (1 ton or megagram).
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A package of chips weighs 45 grams. How much is that in kilograms?
Sunspots _____. A) are found in the chromosphere B) are dark spots in the corona C) are areas where the photosphere is cooler D) happen when certain areas are hotter than others
What is the resultant velocity vector when you add your swimming velocity and the current velocity? give the x and y components in meters per second separated by a comma?
The resultant vector, is the vector that adds the components x and y separately.
Since the two x components are 0.00 m/s and 1.00 m/s, the resultant x component will be:
0.0 m/s + 1.00 m/s = 1.00 m/s in + x directionThe simultaneous vector of velocity in the form of components x and y is
1, -1 m / s
Further explanation
Vectors are quantities that have magnitude and direction
Vector can be symbolized in the form of directed line segments
One of the presentations of vector shapes is in geometric conditions where the vector components are expressed in the form of x and y coordinates which can be described in matrix form
The position vector of a vector starts from the starting point to the endpoint
Addition of two vectors is the addition of component x and component y
A (x1, y1) and B (x2, y2)
A + B = (x1 + x2, y1 + y2)
There is additional information on the problem:
a swimmer moves to the right with a speed of 1 m / s while the current from the river with the same speed down by 1 m / s (picture attached)
so the vector component position based on components x and y becomes:
swimmer (p): (1,0)
river current (s): (0, -1)
So if the two vectors are added it will become:
v = p + s
v = (1 + 0, 0-1)
v = (1, -1) m / s
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Keywords: vectors, a swimmer, river, Addition of two vectors
A 20 kg object is dropped from a very tall building. What is the weight of this objects? After 5 seconds, how has the object fallen and what is its speed at this instant?
1. What is the weight of this objects?
Weight is simply the product of mass and gravitational acceleration. Therefore the weight is:
w = 20 kg * 9.81 m/s^2
w = 196.2 kg m/s^2 = 196.2 N
2. After 5 seconds, how has the object fallen and what is its speed at this instant?
We can use the formula:
y = v0 t + 0.5 g t^2
v = v0 + g t
where v0 = 0 since the object starts from rest, y is the distance it fell, t is time
y = 0 + 0.5 * 9.81 * 5^2 = 122.625 m
v = 0 + 9.81 * 5 = 49.05 m/s
When you lift a box off the ground, gravity opposes your lifting force.
A.True
B.False
During football practice, a football is kicked with a speed of 22 m/s at an angle of 60.0° relative to the positive x direction. at that instant, an observer rides past the football in a car that moves with a constant speed of 11 m/s in the positive x direction. determine the initial velocity of the ball relative to the observer in the car.
Final answer:
The initial velocity of the football relative to an observer moving at 11 m/s in the positive x direction is solely its vertical component since the horizontal velocities cancel each other out.
Explanation:
To determine the initial velocity of the football relative to the observer in the car, we must consider the velocity of the football and the velocity of the car. The football's velocity (22 m/s) can be broken down into horizontal and vertical components.
The horizontal component (Vx) is calculated using the formula Vx = V * cos(θ), and the vertical component (Vy) is V * sin(θ), where V is the speed of the football and θ is the angle of kick relative to the positive x direction. Given V = 22 m/s and θ = 60°, we get Vx = 22 * cos(60°) and Vy = 22 * sin(60°).
The observer's velocity must be subtracted from the football's horizontal component to determine the relative horizontal velocity (Vx_relative). Therefore, Vx_relative = Vx - velocity of the car.
Now to calculate the total initial velocity of the football relative to the observer, we must combine the relative horizontal velocity with the unchanged vertical component Vectorially.
Equations and calculations:
Vx = V * cos(θ) = 22 * cos(60°) = 11 m/s.Vy = V * sin(θ) = 22 * sin(60°)Vx_relative = Vx - velocity of the car = 11 m/s - 11 m/s = 0 m/s.Thus, the initial velocity relative to the observer combines Vx_relative = 0 m/s and Vy (unchanged).The initial velocity of the football relative to the observer in the car is therefore the same as its vertical component because the horizontal components cancel out.
Which activity can substantially increase the activity level of a person's lifestyle? driving a car using an escalator washing dishes walking to school
Answer: walking to school
Physical activity refers to the movement of skeleton muscles which requires the expenditure of energy by the body. This involves daily movement or motion activities an human being perform in order to carry out a desired function. For example, walking to class, cleaning a house and mowing the lawn all these activities involves the movement of muscles. Exercise is also a physical activity which is required to be done to maintain the fitness of the body.
Walking to school will substantially increase the activity level of a person's lifestyle because it favors the movement of muscles and bones and ensures the entire body activity by the expenditure of energy. This will help in booting up of stamina and endurance. Therefore, will make a person physically fit to lead a healthy life style.
If you get the answer, how do you know?
I drop a penny from the top of the tower in Midland Borough and it takes 1.85 seconds to hit the ground. Calculate the velocity at impact in m/s.
When a 75 kg man sits on the stool, by what percent does the length of the legs decrease? assume, for simplicity, that the stool's legs are vertical and that each bears the same load?
Each leg of the stool decreases in length by approximately 1.40 × 10⁻⁴% when the 70 kg man sits on it.
Calculate the force exerted on each leg:
Given: mass (m) = 70 kg, acceleration due to gravity (g) = 9.8 m/s²
Force (F) = mass × acceleration = 70 kg × 9.8 m/s² = 686 N
Determine the original length of the legs:
Let's assume the height of the stool is 1 meter (100 cm).
Calculate the cross-sectional area of each leg:
Given the diameter of each leg is 2.5 cm, the radius (r) is 1.25 cm or 0.0125 m.
Area (A) = π × r²
Area ≈ 3.14 × (0.0125 m)² ≈ 4.91 × 10⁻⁴ m²
Determine the modulus of elasticity of Douglas fir:
Let's assume E = 10 × 10⁹ N/m².
Calculate the change in length for each leg:
Using the formula for axial deformation:
Change in length (ΔL) = (Force × Length) / (Area × Modulus of Elasticity)
ΔL = (686 N × 1 m) / (4.91 × 10⁻⁴ m² × 10 × 10⁹ N/m²)
ΔL ≈ 1.40 × 10⁻⁶ m
Calculate the percentage decrease in length:
Percentage decrease = (Change in length / Original length) × 100%
Percentage decrease = (1.40 × 10⁻⁶ m / 1 m) × 100%
Percentage decrease ≈ 1.40 × 10⁻⁴ %
So, each leg of the stool decreases in length by approximately 1.40 × 10⁻⁴% when the 70 kg man sits on it.
The question probable may be:
A three-legged wooden bar stool made out of solid Douglas firhas legs that are 2.5 cm in diameter.
When a 70 kg man sits on thestool, by what percent does the length of the legs decrease?Assume, for simplicity, that the stool's legs are vertical and thateach bears the same load.
During what process does the gases that make up the solution we breathe are separated
To solve this we must be knowing each and every concept related to solution. Therefore, respiration is the process with which gases that make up the solution we breathe are separated.
What is solution?Solution is a homogeneous mixture which contain two component that are solute and solvent . Solute is the amount of component which is in small amount whereas solvent is a component which is in large amount.
Respiration is the process with which gases that make up the solution we breathe are separated. Respiration is a mechanism that occurs inside cells to produce energy by breaking down glucose molecules. The process may be neatly separated into two groups based on the usage of oxygen: anaerobic and aerobic respiration.
Therefore, respiration is the process with which gases that make up the solution we breathe are separated.
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You wash the dishes. when you let the water down the drain, where is the water flowing the fastest?
This chemical equation represents the burning of methane, but the equation is incomplete. What is the missing coefficient in both the reactants and the products? CH4 + ____O2 → CO2 + ____H2O
Final answer:
The missing coefficients in the chemical equation for the combustion of methane are '2' for both O2 on the reactant side and H2O on the product side, making the balanced equation CH4 + 2O2 → CO2 + 2H2O.
Explanation:
The chemical equation in question represents the combustion of methane, which is a reaction where methane burns in the presence of oxygen to produce carbon dioxide and water. To balance the equation, we look at the number of atoms on both sides of the reaction and adjust them by adding coefficients. The balanced chemical equation is CH4 + 2O2 → CO2 + 2H2O. This indicates that one methane molecule reacts with two oxygen molecules to yield one carbon dioxide molecule and two water molecules. It is important in chemical equations to use the smallest possible whole-number coefficients to maintain the law of conservation of mass. The combustion of methane is an exothermic reaction as it releases energy in the form of heat and light.