Mechanics | Relativity Answers

Driving along a crowded freeway, you notice that it takes a time to go from one mile marker to the next. When you increase your speed by 7.4 mph, the time to go one mile decreases by 15 sec. Final answer must be in mph.

A baseball being hit is in contact with the bat for 1.30 ms. The ball is moving toward the bat at speed 38.0 m/s just before it is hit, and is moving at 67.5 m/s away from the bat just after it is hit. Assume the ball has a constant acceleration while it is in contact with the bat, and that the ball’s motion is always along a straight line.
(a)Calculate the acceleration of the ball while it is being hit.
(b)What is the ball’s net displacement while it is in contact with the bat?

1) Driving along a crowded freeway, you notice that it takes a time to go from one mile marker to the next. When you increase your speed by 7.4 , the time to go one mile decreases by 13 s. what was your initiual speed? 2) Starting from rest, a boat increases its speed to 4.32 with constant acceleration. What is the boat’s average speed? If it takes the boat 4.62 to reach this speed, how far has it traveled? 3) As a train accelerates away from a station, it reaches a speed of 4.5 in 5.4 . If the train's acceleration remains constant, what is its speed after an additional 6.0 has elapsed? 4) The position of a particle as a function of time is given by Find the average velocity of the particle from to . And Find the average velocity from to .

Nancy pulls the bull from the front with a force of 400N. Bess pushes from the back with a force of 500N. What is the net force?

A kite dropped from 168m high cliff and falls with constant velocity of 2.8m/s.32s after kite is relased a pebble is dropped from the cliff. How long does it take for the kite to reach the ground?

A piano is suspended 3.6m above the ground and is being raised to apartment 50m high with constant speed of 0.62m/s, after piano has been moving upward for 3.5s coffee cup falls from apartments window onto piano. At what height above the ground is the piano when the cups strikes?

A ball is projected from the top of a tower 60m high with a velocity of 30m/s. How long does it take to reach the ground?

What is relative velocity?

Weightless thread can support tension up-to 2.5N. A stone of mass 0.5 kg is tied to it and is revolved in a circular path of radius 2.5 m in a vertical plane. Find maximum angular velocity of the stone.

A body moving along a straight line at 20m/s undergoes an acceleration of 4m/s2. Find its speed after 2 seconds.