College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Suppose a 975-kg car can produce a useful power output of 45.5 hp (1 hp = 746 W).
(a) How long, in seconds, will it take the car to reach a speed of 15.5 m/s, neglecting friction.
(b) How long, in seconds, will this acceleration take if the car also climbs a 2.9-m high hill in the process?
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- A skier of mass 61 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 2.9 m/s? KJ (b) What power (expressed in hp) must a motor have to perform this task? hparrow_forwardA 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.arrow_forwardA 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?arrow_forward
- 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?arrow_forwardA 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? hparrow_forward(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 sarrow_forward
- An advertisement claims that a(n) 1600 kg car can accelerate from rest to 26 m/s in 8.4 s. Given: Unit conversion: 746 W/hp. What average power must the motor pro- duce to cause this acceleration, if we ignore friction and air resistance? Answer in units of hp. Answer in units of hp. Your response... PALETTEarrow_forward(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 O Readingarrow_forward
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