1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy?

2. What is the speed of a 0.25 kg ball if its kinetic energy is 15 J?

3. if the speed of an object is tripled and the mass is halved by what factor does the kinetic energy change?

4. a ball is thrown up in the air. Which of the following quantities increases as the ball gets higher?

5. a 10.0 kg crate slides across the floor 13 m against a force of friction of 7.5 N. what is the thermal energy produced?

6. in the process of being thrown, a 500.0 g ball goes from rest to a speed of 10.0 m/s over a distance of 0.75 m. What is the force that was exerted on the ball?

1. 👍 0
2. 👎 0
3. 👁 1,130
1. 1. PE = mg*h = 15 *9.8*0.5 = 73.5 J.

2. 0.5*0.25*V^2 = 15
0.125V^2 = 15
V^2 = 120
V = 11 m/s.

3. KE1 = 0.5m*V^2
KE2 = 0.5*(0.5m)*(3V)^2 = 0.5*0.5m*9V^2 = 0.25m*9V^2 = 2.25m*V^2.

KE2/KE1 = 2.25m*V^2/0.5m*V^2=4.5 = 9/2.

4. You didn't show the choices. However,
PE = mg*h. Therefore. PE increases with
height.

6. a = (V^2-Vo^2)/2d = (10^2-0)/1.5 =
66.67 m/s^2.

F = m*a = 0.5 * 66.67 = 33.33 N.

1. 👍 0
2. 👎 0
2. 12

1. 👍 0
2. 👎 0

## Similar Questions

1. ### PHYSICS

The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single waterfall has a height of 807 m. If water at the top of the falls is at 16.7°C, what is the maximum temperature of the water at

2. ### physics

a boy tosses a coin upward with a velocity of 14.7 m/s. a. find the maximum height reached by the coin. b. time of flight c. velocity when the coin returns to the hand d. suppose the boy failed to catch the coin and the coin goes

asked by jenalyn calimag on July 31, 2013
3. ### Gr 12 Advanced Functions

The boy decides to ride the Terror Tower. At its maximum height, the ride reaches 65 m above the ground. When the boy reaches the top of the tower, his gum falls out of his mouth. The height of the gum can be given by the

asked by Sameer on July 30, 2017
4. ### Physics

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor? (Round to the first decimal point and don't

asked by George on December 19, 2011
5. ### mathematics

A semicircular garden bed at the botanical gardens needs to be fenced off while the seedlings are established. If the straight edge of the bed is 20.5m in length, calculate the total length of fencing needed to surround the garden

asked by help on June 3, 2020
1. ### Algebra

A rubber ball rebounds 3/5 of the height from which it falls. If it is initially dropped from a height of 30 ft. What total vertical distance does it travel before coming to rest?

asked by PDF on January 28, 2012
2. ### Physics

A boy starts at rest and slides down a frictionless slide as in the figure below. The bottom of the track is a height h above the ground. The boy then leaves the track horizontally, striking the ground a distance d as shown. Using

asked by Brandon on October 17, 2011
3. ### English

In the excerpt from Barrio Boy, why does Miss Hopley have another boy come to her meeting with Ernesto and his mother? Ernesto has gotten into a fight with the other boy. The other boy is Ernesto's older brother. Ernesto and his

asked by Anonymous on December 8, 2014
4. ### Physics

At a county fair, a boy and two friends bring their teddy bears on the giant Ferris wheel. The wheel has a diameter of 14.0 m, the bottom of the wheel is 1.9 m above the ground and its rim is moving at a speed of 1.0 m/s. The boys

asked by Gina on October 14, 2010
5. ### geometry

A flower bed in the corner of your yard is in shape of a right triangle. The perpendicular sides of the bed measure 6 feet 8 inches and 8 feet 4 inches. Calculate the area of the flower bed.

asked by kim on March 4, 2012