(a) How long (in s) will it take an 855 kg car with a useful power output of 36.0 hp (1 hp = 746 W) to reach a speed of 13.0 m/s, neglecting friction? (Assume the car starts from rest.) (b) How long (in s) will this acceleration take if the car also climbs a 2.80 m-high hill in the process? Additional Materials

A car of mass 800.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 39.6 km/hr (11.0 m/s), the net power which the engine supplies is 3900.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at that time.

A 699-kg elevator starts from rest and moves upward for 2.60 s with constant acceleration until it reaches its cruising speed, 1.83 m/s. (a) What is the average power of the elevator motor during this period? hp (b) How does this amount of power compare with its power during an upward trip with constant speed? (Give the power during an upward trip with constant speed.) hp Need Help? Read It

A Ford F-150 pickup truck has a mass of 1950 kg.   One truck is equipped with an Ecoboost 2.7 liter V6 engine that produces a useful power output of 242 kW.        (a)  How long in seconds does it take the truck to start from rest and reach a speed of 12.5 m/s, assuming no friction effects and it is traveling on a level road?       (b)  How long will it take to reach the speed of 12.5 m/s from rest, if the truck also climbs a hill that has a height of 2.75 m?

If a car (m = 1200 kg) generates 18 hp when traveling at a steady 90 km/h, what must be the combined force exerted on the car due to friction and air resistance? How much power altogether must the car supply to accelerate to 100 km/h in 5.0 s?

A skier of mass 77 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull hìm 45 m up a 30° slope (assumed frictionless) at a constant speed of 1.9 m/s? kJ (b) What power (expressed in hp) must a motor have to perform this task? hp

The speed of a crate traveling on a horizontal frictional surface changes from vi=13 m/s to vf=11.5 m/s in a distance of d=8.5 m. (A) how long in seconds did it take for the crate to slow by this amount, assuming the acceleration is constant? (B) if the crate has a mass of 1kg, what is the power supplied to the crate by friction? (C) what is the coefficient of kinetic friction between the crate and the surface uk?

(a) What is the power output in watts and horsepower of a 73.0 kg sprinter who accelerates from rest to 10.1 m/s in 3.50 s? power in watts ____ W power in horsepower _____hp (b) Considering the amount of power generated, do you think a well-trained athlete could do this repetitively for long periods of time?

(a) How long (in s) will it take an 860 kg car with a useful power output of 42.0 hp (1 hp = 746 W) to reach a speed of 17.0 m/s, neglecting friction? (Assume the car starts from rest.) 3.966 (b) How long (in s) will this acceleration take if the car also climbs a 2.60 m-high hill in the process? 14.02 X s

(a) How long (in s) will it take an 865 kg car with a useful power output of 38.0 hp (1 hp = 746 W) to reach a speed of 13.0 m/s, neglecting friction? (Assume the car starts from rest.) 2.88 X S