A train is traveling up a 3.73° incline at a speed of 3.25 m/swhen the last car breaks free and begins to coast without friction. (a) How long does it take for the last car to come to rest momentarily? (b) How far did the last car travel before momentarily coming to rest? Graph and Explain.

A box is being pulled to the right over a rough surface. T> fk, so the box is speeding up. Suddenly the rope breaks. What happens? The box Select one: a. Slows steadily until it stops b. Continues with the speed it had when the rope broke С. Continues speeding up for a short while, then slows and stops. O d. Keeps its speed for a short while, then slows and stops. e. Stops immediately

At an accident scene on a level road, investigators measure a car's skid mark to be 88 m long. It was a rainy day and the coefficient of friction was estimated to be 0.35. a.)Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Express your answer to two significant figures and include the appropriate units.

1. You are tasked with designing the runway on an aircraft carrier. The minimum speed for the F/A18 Hornet is 200 mph. The Hornet weighs 40,000 lbf and its twin engines provide a thrust of ~40,000 lbf combined, providing a max acceleration of 1g.a. How long must the deck be to takeoff unassisted? Give the answer in ft. b. This is most likely longer than your typical ~450 ft carrier. What acceleration must you achieve with both the engines and with a catapult system together to reach the required minimum speed by the end of the deck? c. What net force (combined engines and catapult) must be applied to the plane to get the acceleration in b? d. Do you think the plane will be able to use disk brakes on its tires to stop when landing?Use your knowledge of friction to make your argument. Also know that their coefficient of friction is ~1.

6. Two blocks are connected by a light string passing over a light, frictionless pulley as shown in the figure. Block m1, initially at rest, is released from height h above the table. Block m,, which is the heavier block, begins to fall, while block m2 rises. a) Calculate the speed of m2 just as m¡ hits the table. b) Suppose block m, continues to rise without obstruction even after block m, hits the table. Calculate the maximum height above the table to which m2 rises. h

A 1700 kg car is driving down a highway at a constant velocity when a deer jumps out onto the road 59.6 m ahead. The coefficient of friction between the car tires and the road is 0.21.    Calculate the initial velocity of the car if it is able to stop just before hitting the deer. (You do not need to account for reaction time of the driver. Assuming the car is breaking the entire 59.6 m distance and that friction is the only force stopping the car.)  v0 =          m/s

10. If two objects are dropped in an environment without air resistance, what will occur? Both of the objects will fall with constant velocity O The lighter of the two objects will fall faster than the heavier. O The heavier of the two objects will fall faster than the lighter. O The objects will accelerate downward at the same rate.

A hockey puck (mass = 2 kg) leaves the players stick with a speed of 20 m/s and slides on the ice before coming to rest.The coefficient of friction between the puck and the ice is 0.9. How far will the puck slide after leaving the players stick? m

2. You place a crate of mass 37.0 kg on a frictionless 4.65-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.37 s after you released it. What is the angle of the incline?     42.4 degrees     55.1 degrees     36.4 degrees     30.3 degrees

Flying Circus of Physics A man of mass 71 kg drops to a concrete patio from a window 1.2 m above the patio. He neglects to bend his knees on landing, taking 2.8 cm to stop. (a) What is his average acceleration from when his feet first touch the patio to when he stops? (b) What is the magnitude of the average stopping force exerted on him by the patio? (a) Number (b) Number M. Jak w Units Units