4. An object is released from rest at X and slides to Y. The vertical distance between X and Y is 10 m. During the motion, 20% of the object's initial gravitational potential energy is lost as friction. A. What is the speed of the object at Y? 16 X 2√g C4√g D. 8g 10m Tal com insy halominic al

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4. An object is released from rest at X and slides to Y. The vertical distance between X and Y is
10 m. During the motion, 20% of the object's initial gravitational potential energy is lost as friction.
5.
16
A. V
√g
好 2√g
4√g
D. 8g
X
What is the speed of the object at Y?
10m
A. 2 MJ m 3
B. 4 MJ m 3
C 2 GJm-3
D. 4 GJ m 3
Y
A car engine has a useful power output of 20 kW and an efficiency of 50 %. The engine
consumes 1 x 10-5 m³ of fuel every second. What is the energy density of the fuel?
20,000
.50 = x
Transcribed Image Text:4. An object is released from rest at X and slides to Y. The vertical distance between X and Y is 10 m. During the motion, 20% of the object's initial gravitational potential energy is lost as friction. 5. 16 A. V √g 好 2√g 4√g D. 8g X What is the speed of the object at Y? 10m A. 2 MJ m 3 B. 4 MJ m 3 C 2 GJm-3 D. 4 GJ m 3 Y A car engine has a useful power output of 20 kW and an efficiency of 50 %. The engine consumes 1 x 10-5 m³ of fuel every second. What is the energy density of the fuel? 20,000 .50 = x
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