The kinetic energy of a car is J as it travel along a horizontal road. How much

Question

The kinetic energy of a car is J as it travel along a horizontal road. How much power is required to stop the car in 10 s? A) 8 times 10^W B) 8 times 10^4 W C) zero watts D) 8 times 10 W E) 8 times 10^7 W A helicopter (m = 3250 kg) is cruising at a speed of 56.9 m/s at an altitude of 185 m. What is the total mechanical energy of the helicopter? coaster car is moving at 20 m/s along a straight horizontal track. What will be after climbing the 15-m hill shown in the figure, if friction is ignored?

Explanation / Answer

5)

power = energy /time

power = (8*10^6)/10

power = 8*10^5 W

OPTION D

2)

total mechanical energy = translational kE + gravitational PE

E = KE + PE

E = (1/2)*m*v^2 + m*g*h

E = (1/2)*3250*56.9^2 + (3250*9.8*185)

E = 11153366.25 J <<<<--------------answer

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