A car is moving along the ground at 20m/s with a mass of 1200kg. If µg=0.8 and H,=0.7: a. What maximum acceleration can the car brake with? b. In this case, what is its stopping distance? c. Why is the car's stopping distance longer if the wheels lock and the car skids to a stop?

A value of 1 J is equal to what?   A.1N * m^2 B.1N*M C. 1 n/m^2

1. Which of the following is NOT an example of potential energy? a. A running woman b. An incredibly compressed spring C. A tightly stretched rubber band d. An apple dangling off a branch 2. A ball drops from a height h. What more do we need to calculate initial potential energy? a. Elasticity of the Ball b. Mass c. Final Velocity d. Horizontal Displacement

A 1200 kg car is moving at 30 m/s and comes up to a hill. How high can the car go up the hill before stopping? B I

A track has three hills. A-18m, B=10m, C=5m. Mass of the ball=2kg. The ball descends down the first hill and reaches the bottom (closed system) A. What is the speed of the ball at the bottom of hill A? B. The continues up hill B. What is the speed at the top of the hill B C. The ball continues to roll up hill C. What is the ball speed at the top of the hill C? D. What will be the answer to (a) if a 4kg ball is used? Why?

Suppose that during each step, the leg of the student, which is 0.90 meters long, swings through a total distance of 2.0 m. At the end of the swing, this foot rests on the ground for 0.2 s before the other leg begins its swing. a. At what speed does this student walk? (Think carefully about how far forward the student moves at each step.) b. The swinging leg reaches its maximum speed at the bottom of its arc. How many times faster is this maximum leg speed (measured with respect to the ground) than the average walking speed?

An object moving at 21.0 m/s has 1390 J of kinetic energy. What is the object's mass? A. 6.30 kg B. 66.2 kg C. 3.15 kg D. 33.1 kg

A student stands at the top of a building of height 50 m. He throws two identical balls with a speed of 20m/s, one up, the other down. If air resistance is included which ball strikes the ground with higher speed? A. The ball thrown upward B. The ball thrown downward C. Both balls will have the Same speed

You slam on the gas of your racecar and you accelerate at 12 m/s² from rest. How long will it take you to reach a velocity of 48 m/s? a. 4 seconds. b. 2 seconds. c. 1 second. d. 12 seconds.

1. Which of the following is NOT an example of potential energy? a. A running woman b. An incredibly compressed spring G. A tightly stretched rubber band d. An apple dangling off a branch 2. A ball drops from a height h. What more do we need to calculate initial potential energy? a. Elasticity of the Ball b. Mass c. Final Velocity d. Horizontal Displacement