A skateboarder rolls down a hill and up the other side. Would she ever reach the same height on the other side? Would it make a difference if her mass was larger or smaller? Explain.
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- A person is trying to lift a box off the floor. The box has a mass of 55kg and the person can lift with a force of300N.a. Can the person lift the box?b. Find the normal force acting on the box.If it takes a human cannonball 1.8 s to exit a 1.9 m long cannon and the average net force acting on the human is 159 N, what is the human’s mass?Imagine you are learning to drive. You get into your guardian's vehicle to practice, but all you see in the rearview mirror is the back seat. Why does this happen?
- It has been found that a 1500 kg car can stop in 32 m from a speed of 20 m/s. How much force do the brakes apply?2) Three equal negative charges, Q1=Q2=Q3=-Q are arranged on an equilateral triangle of side a centered at the origin as shown in the figure below. А. Sketch the electric field everywhere in space. В. What electric force (direction and magnitude) does Q3 feel? С. Can you replace Q2 with another charge so that Q3 feels no net force? D. Determine the electric flux through a spherical surface of radius 5a centered at the origin. Е. What is the approximate electric field (magnitude and direction) distance 1000a from the origin?A car accelerates at 4 m/s2. If it has a mass of 1500 kg, what net force is applied to the car?
- #3 pleaseOn a separate occasion, Michael threatened to jump from the roof of hisoffice building as a demonstration of seasonal depression. If it takes 1.2seconds for his body to plummet to the ground,a. How fast will he be going when he reaches the ground?b. How far will he have fallen in meters?c. In feet?d. If Michael weighs 185 lbs, what would his force of collision with theground be, in Newtons, if his sudden deceleration upon impact takes0.1 seconds? ( 1 lb = 4.45 N, which means on Earth, a weight of 2.2lbs corresponds to a mass of 1 kg)A boy having a mass of 75 kg holds in his hands a bag of flour weighing 40 N. What is the normal force on the boy’s feet?
- You are moving a crate of books across the carpet by applying a force. The crate moves at constant velocity. What would happen if you stopped pushing the crate, let it come to a stop, and then pushed the crate again with the same force.What average force is required to stop a 950-kg car in 8.0 s if the car is traveling at 95km/h ?A 2000-kg car traveling at 23 m/s takes 54 m to stop under full braking. The same car under similar similar road conditions, traveling at 35 m/s takes _________ m to stop under full braking.