For part (a) is energy lost to the environment and due to friction? re Suppose t

Question

For part (a) is energy lost to the environment and due to friction?
re Suppose that an automobile is travelling at a constant speed on a horizontal is running and obviously producing energy. Where does this energy go? speed on a road; the (It does go into kinetic energy of the automobile, because the kinetic energy does not chan if the speed is constant.) (b) An automobile moving at 90 km/h ascends a hill of gradient 1 in 25 (i.e., a vertical rise of 1 unit for a horizontal distance of 25). Its mass is 1300 kg. What power (in kilowatts) is needed for the climb up the hill over and above the normal power used when moving horizontally? Assume two significant digits.

Explanation / Answer

a)

Here energy is lost due to the enviroment and due to friction is in the form of heat .

b)

Here

Sin(o) =1/25

Power needed to climb the hill is

P=mgVsin(o)

Given V=90 Km/h =90*1000/3600 =25 m/s

=>P=1300*10*25*(1/25)

P=13000 Watts =13 KW

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