If a 1300 kg car can accelerate from 30 km/h to 60 km/h in 3.9 s , how long will it take to accelerate from 60 km/h to 95 km/h ? Assume the power stays the same, and neglect frictional losses. t2 =

A car requires 72.8 hp to maintain a constant speed of 21.3 m/s on a straight, flat road. Assuming other losses are negligible, determine the magnitude of the total resistive force FR acting on the car (due to friction, air resistance, etc.). Use this conversion as needed: 1 hp = 746 W. FR = × 10³ N

An object with a mass of 12.5 kg is moving along a rough horizontal surface. At a certain point it has 66 J of kinetic energy. If the coefficient of friction between the object and the surface is 0.44, how far will the object go beyond that point before coming to a stop? Express your answer in meters, to at least one digit after the decimal point. plz help and use g = 9.8

A car has an engine that produces constant power. The car is accelerated from rest at t = 0, and at t = t0 the acceleration is a0. What is the acceleration of the car at = 4t0?

When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, estimate the total friction force acting on the car when it is moving at a speed of 30 m/s. One horsepower equals 746 W.

Multiple-Concept Example 13 presents useful background for this problem. The cheetah is one of the fastest accelerating animals, for it can go from rest to 31.8 m/s in 3.38 s. If its mass is 119 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in (a) watts and (b) horsepower. (a) Number i (b) Number Units Units

24. A skier of mass 70 kg is pulled up a slope by a motor-driven cable. How many horsepower output must a motor have to pull him 100 m up a 30° frictionless slope at a constant speed of 2 m/s? a.700 b. 0.94 c. 746 d. 1.06 a b d

An elevator car (shown in the figure below) has a mass of 2000 kg and is carrying passengers having a combined mass of 500 kg. A constant friction force of 2000 N retards its motion. How much power must a motor deliver to lift the elevator car and its passengers at a constant speed of 3.00 m/s? (g= 10 m/s) Motor O a. 81 kW O b. 108 kW O c. 54 kW O d. 27 kW

A funny car accelerates from rest through a measured track distance in time 56 s with the engine operating at a constant power 230 kW. If the track crew can increase the engine power by a differential amount 1.0 W, what is the change in the time required for the run? Number i 8.1 Units S

Suppose you are biking at a constant speed up a road inclined at 5° above the horizontal. You need to bike up this hill for 200 m in 2 minutes or less. There is an average drag force of 25 N as well. Calculate the minimum amount of power in hp your body must provide in order to make it up this hill in time. Assume 80 kg total mass of yourself and bike and 25% energy efficiency in your body. Define a system and draw energy state diagrams as part of your solution. Draw any necessary FBDs for forces. B