Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom?
a. The block that went straight down.
b. The block that went down the ramp.
c. They both will have the same speed.
d. Insufficient information to work the problem.
[Ques. 2] A 1.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero.
b. 98.0 J.
c. 98.0 J.
d. 196 J.
e. 196 J.
[Ques. 3] A hill is 150 m long and makes an angle of 12 with the horizontal. As a 60-kg jogger runs up the hill, how much work does gravity do on the jogger?
a. 8.82E+4 J
b. 1.83E+4 J
c. 1.83E+4 J
d. 8.63E+4 J
e. zero
[Ques. 4] Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10 with the horizontal. What potential energy change does the crate experience?
a. 1.8E+3 J
b. 1.8E+3 J
c. 1.2E+1 J
d. 3.1E+2 J
e. 1.0E+4 J
[Ques. 5] As an object is lowered into a deep hole in the surface of the Earth, which of the following must be assumed in regard to its potential energy?
a. increase
b. decrease
c. remain constant
d. cannot tell from the information given
[Ques. 6] A 8.00-kg bowling ball falls from a 3.50-m shelf. Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)
a. 280 J
b. 49.0 J
c. 2.86 J
d. 274 J
e. 28.0 J
[Ques. 7] Jasper takes two books of mass m1 and m2 off the floor and places them on a shelf at height h. The change in potential energy of the book with mass m1 is four times that of the book with mass m2 . What is the relationship between m1 and m2?
a. m1 = 0.25m2
b. m1 = 0.5m2
c. m1 = 2m2
d. m1 = 4m2
[Ques. 8] A boat with mass of 1 200 kg is traveling at 12 m/s. What is the magnitude of the force required to stop the boat if it undergoes a displacement of 85 m?
a. 2 000 N
b. 170 N
c. 8 500 N
d. 1 000 N
[Ques. 9] A boat with mass 950 kg is heading into the harbor at a speed of 10.0 m/s. How much work is required to slow the boat to 1.0 m/s?
a. 4.8E+4 J
b. 9.4E+4 J
c. 4.7E+4 J
d. 2.3E+4 J
[Ques. 10] A 6.1-g bullet has a velocity of 475 m/s when it penetrates a wooden door to a depth of 3.5 cm. Assuming the frictional force that stops the bullet is constant, how long does it take from the time the bullet hits the door till it comes to a stop?
a. 1.5E4 s
b. 7.4E5 s
c. 4.5E2 s
d. 3.7E3 s
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