1. 1500 lb car is moving at a speed of 60 MPH. Calculate the kinetic energy of t
ID: 1506051 • Letter: 1
Question
1. 1500 lb car is moving at a speed of 60 MPH. Calculate the kinetic energy of the car.Remember that 1 lb = 0.45 kg , 1 mile = 1609 m, and 1h = 3600 s
A.
140000 J
B.
242707 J
C.
119854 J
D.
127000 J
E.
9052 J
F.
18104 J
2. A 1500 kg car is stopped at the top of a mountain of 100 m high, If no further transformation of energy such as heat. As is the kinetic energy of the car when it is at a height of 0 m ? ( G = 9.8m / s2 )
A.
150000 J
B.
245899 J
C.
735000 J
D.
150 J
E.
1470000 J
F.
50000 J
3. Assume no friction on a roller coaster, a boy of mass 250 kg decides skating on a roller coaster , the boy is at the highest point is 100 meters high. Determines the speed to reach the ground. ( G = 9.8m / s2 )
A.
44.27 m/s
B.
17 m/s
C.
55.5 m/s
D.
98 m/s
E.
1960 m/s
F.
980 m/s
A.
140000 J
B.
242707 J
C.
119854 J
D.
127000 J
E.
9052 J
F.
18104 J
Explanation / Answer
2.
using conservation of energy
Potential energy at Top = kinetic energy at bottom
mgh = KE
KE = 1500 x 9.8 x 100 = 1470000 J
3.
using conservation of energy
Potential energy at Top = kinetic energy at bottom
mgh = (0.5) mV2
V = sqrt(2gh) = sqrt(2 x 9.8 x 100) = 44.27 m/s
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