Junebugg
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Homework Statement
6. A 2.5-kg book slides horizontally and falls from a shelf 3.0m above the floor. How much work does the force of gravity do on the book as it falls 3.0m?
F. 1.2 J
G. 7.5 J
H. 24.5 J
J. 73.5 J
7. Which of the following is the minimum amount of work done by a hydraulic lift to raise a 150-kg aluminum block 2.0m vertically?
A. 75 J
B. 300 J
C. 1470 J
D. 2940 J
8. The motion of roller coasters depends upon the conversion of potential and kinetic energy. a 100-kg car starts from rest at the top of a hill with a height of 50 m. Which of the following is this car's kinetic energy at the bottom of the hill?
F. 150 J
G. 5000 J
H. 49,000 J
J. 98,000 J
9. A 0.25-g paint chip comes off a satellite orbiting Earth. The velocity of the paint chip is 7000 m/s. Which is the kinetic energy of the paint chip?
A. 1750 J
B. 6125 J
C. 12,250 J
D. 24,500 J
10. An automobile was moving at 15 m/s and accelerated at 2 m/s^2 for 2 s. Which was its final speed?
F. 17 M/S
G. 25 M/S
H. 27 M/S
J. 35 M/S
Homework Equations
ke=1/2mv^2
The Attempt at a Solution
for 8 I'm getting G or H
for 9 I'm getting A or B
for 10 I'm getting J