PHYSICS HIGH SCHOOL

A 600 kg car is at test and then accelerated to 5m/s , what is its original kinetic energy

Answers

Answer 1

Answer:

Answer:

0 J

Explanation:

Kinetic energy is defined as:

KE = 1/2 m v²

where m is mass and v is velocity.

The car starts at rest, so it has zero velocity. Therefore, its initial kinetic energy is 0 J.

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Which unit of measurement is included in the International System of Unit! (si)?
In one hand you hold a .12-kg apple, in the other hand a .20-kg orange. The apple and orange are separated by .75 m. What is the magnitude of the force of gravity that (a) the orange exerts on the apple? (b) the apple exerts on the orange?
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Sandra's target heart rate zone is 135bpm—172bpm. Marissa's target heart rate zone is 143bpm—176bpm. They stop playing basketball and take their pulse, and both count the heart rate at 144bpm. If they decrease their heart rates by 20bpm, who will be in her THR zone?

When celery is placed in a glass of pure water the solution inside its cells is _____ compared to the water.?

Answers

The correct answer to the question above is hypertonic. When celery is being placed in a glass of pure water, the solution inside its cells is going to appear as hypertonic compared to the water. This means that the cells inside has a higher concentration than outside.

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 67 m when wurth (jaw6696) – Ch 2 LT 3/4 – kreft – (61920) 2 thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m.

Answers

Answer:

402m

Explanation:

We can solve this easily by using the free fall formula:

$v_f^2=v_0^2+2ad$

On both cases the final velocity will be 0m/s (maximum height), so we have:

$v_0^2=-2ad$

We know that the velocity the person imparts to the ball will be the same either on Earth or on the Moon, so we write for both cases:

$v_0^2=-2a_Ed_E$

$v_0^2=-2a_Md_M$

Which means

$2a_Ed_E=2a_Md_M$

So we get (taking into account that gravity on earth is 6 times gravity on the Moon):

$d_M=(a_Ed_E)/(a_M)=(6a_Md_E)/(a_M)=6d_E=6(67m)=402m$

The scientific revolution s advances in knowledge about the physical world led philosophers and other thinkers to believe that if reason structured the physical world, then reason might also be found in the world of human activity and government. a.true
b.false

Answers

The answer for the given statement above would be option A. TRUE. It is true that the scientific revolution's advances in knowledge about the physical world led philosophers and other thinkers to believe that if reason structured the physical world, then reason might also be found in the world of human activity and government. Hope this helps.

a is is correct or true

Elena (60.0 kg) and Madison (65.0 kg) are ice-skating at the Rockefeller ice rink in New Yok city. Their friend Tanner sees Elena move to the right with a speed of 1.20 m/s towards Madison. Madison is moving to the left at a speed of 2.50 m/s towards Elena.1. What is Elena's momentum? (Assume the positive direction is to the right and the negative direction is to the left.)
2, What is Madison's momentum? (Assume the positive direction is to the right and the negative direction is to the left.)
3. What is the total momentum of Elena and Madison?
4. When Elena and Madison collide, they hold onto each other. With what speed and in what direction do both of them move at?

Answers

1. +72.0 kg m/s

The momentum of an object is given by:

p = mv

where

m is the mass of the object

v is its velocity

Taking "to the right" as positive direction, for Elena we have

m = 60.0 kg is the mass

v = +1.20 m/s is the velocity

So, Elena's momentum is

$p_e=(60.0 kg)(+1.20 m/s)=+72.0 kg m/s$

2. -162.5 kg m/s

Here Madison is moving in the opposite direction of Elena (to the left), so her velocity is

v = -2.50 m/s

while her mass is

m = 65.0 kg

Therefore, her momentum is

$p_m= (65.0 kg)(-2.50 m/s)=-162.5 kg m/s$

3. -90.5 kg m/s

The total momentum of Elena and Madison is equal to the algebraic sum of their momenta; taking into account the correct signs, we have:

$p=p_e + p_m = +72.0 kg m/s - 162.5 kg m/s =-90.5 kg m/s$

4. 0.72 m/s to the left

We can find the final speed of Elena and Madison by using the law of conservation of momentum. In fact, the final momentum must be equal to the initial momentum (before the collision).

The initial momentum is the one calculated at the previous step:

$p_i = -90.5 kg m/s$

while the final momentum (after the collision) is given by

$p_f = (m_e + m_m) v$

where

$m_e$ is Elena's mass

$m_m$ is Madison's mass

v is their final velocity

According to the law of conservation of momentum,

$p_i = p_f\np_i = (m_e + m_m) v$

So we can find v:

$v=(p_i)/(m_e + m_m)=(-90.5 kg m/s)/(60.0 kg+65.0 kg)=-0.72 m/s$

and the direction is to the left, since the sign is negative.

Final answer:

Elena's momentum is 72.0 kg*m/s to the right, Madison's is -162.5 kg*m/s to the left. The total system momentum is -90.5 kg*m/s to the left. After colliding, they move together with a speed of 0.724 m/s to the left.

Explanation:

The subject here is Physics, specifically the conservation of momentum. Momentum is calculated as mass times velocity. The positive and negative signs denote direction (right, left).

Elena's momentum is the product of her mass (60.0 kg) and velocity (1.20 m/s). Hence, momentum = 60.0 kg * 1.20 m/s = 72.0 kg*m/s towards the right (positive).
Madison's momentum is the product of her mass (65.0 kg) and velocity (2.50 m/s). Because she's moving to the left, the velocity is negative. Hence, momentum = 65.0 kg * -2.50 m/s = -162.5 kg*m/s towards the left (negative).
The total momentum of Elena and Madison is the sum of their individual momenta: 72.0 kg*m/s + (-162.5 kg*m/s) = -90.5 kg*m/s to the left.
When they collide and hold onto each other, they move together, so their combined mass is 60.0 kg + 65.0 kg = 125.0 kg. The total system's momentum should still be conserved, so -90.5 kg*m/s = 125.0 kg * velocity. Solving for the speed gives velocity = -90.5 kg*m/s / 125.0 kg = -0.724 m/s. The negative sign indicates they move in the negative direction or to the left.

Learn more about Momentum here:

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Before starting this problem, review Conceptual Example 3 in your text. Suppose that the hail described there comes straight down at a mass rate of m/?t = 0.030 kg/s and an initial velocity of v0 = -15 m/s and strikes the roof perpendicularly. Suppose that the hail bounces off the roof of the car with a velocity of +15 m/s. Ignoring the weight of the hailstones, calculated the force exerted by the hail on the roof. __________N

Answers

Answer:

0.9 N

Explanation:

The force exerted on an object is related to its change in momentum by:

$F=(\Delta p)/(\Delta t)$

where

F is the force exerted

$\Delta p$ is the change in momentum

$\Delta t$ is the time interval

The change in momentum can be rewritten as

$\Delta p = m(v-u)$

where

m is the mass

u is the initial velocity

v is the final velocity

So the formula can be rewritten as

$F=(m(v-u))/(\Delta t)$

In this problem we have:

$(m)/(\Delta t)=0.030 kg/s$ is the mass rate

$u=-15 m/s$ is the initial velocity

$v=+15 m/s$ is the final velocity

Therefore, the force exerted by the hail on the roof is:

$F=(0.030)(+15-(-15))=0.9 N$

You have decided to study the effect of loud noise on plant growth. You put one plant in a quiet room and the other plant in your school's band hall. Providing each plant with the same amount of water is an example of aA. data.
B. control.
C. variable.
D. observation.

Answers

b. control

also known as constant

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