Mechanics | Relativity Answers

Spiderman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 3 in the last interval of time of 1.2s of his fall.

What is the height h, in metres, of the building? Express your answer using two significant figures.

A solid cylinder of wood has a cross sectional area of 20cm2 and height of 90cm. It floats upright in water. If two thirds of the length of the cylinder is submerged, calculate: the weight of the water displaced?

Two cars are running at a constant distance of 64 m ,car A is behind car B.if both cars accelerates at the same time ,car A is 11 m/s^2 and car B is 9 m/s^2. When will car A overtake car B?

Joseph stands on top of a building 120 meters high. He throws a ball vertical downward with an initial velocity of 25 m/s. The acceleration due to gravity is 9.8 m/s^2. (a)What is the velocity of the ball after it falls for 2 seconds?& &
(b)What is the position of the ball after 2 seconds?
(c)what time did the ball reach the ground?
(d)What is the velocity of the ball as it strikes the ground?

The drawing shows a golf ball passing through a windmill at a miniature golf course. The windmill has 8 blades and rotates at an angular speed of 1.25 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball of diameter 4.50 × 10−2 m is just passing by one of the rotating blades. What must be the minimum speed of the ball so that it will not be hit by the next blade?

The sun appears to move across the sky, because the earth spins on its axis. To a person standing on the earth, the sun subtends an angle of 9.28*0.001 rad. How much time (in seconds) does it take for the sun to move a distance equal to its own diameter?

an object start from rest with a constant acceleration 8 m/(s2 ) along a straight line find A- the speed at the end of 5 s B-the average speed for the 5s interval c-the distance traveled

an object start from rest with a constant acceleration 8 m/(s2 ) along a straight line find A- the speed at the end of 5 s B-the average speed for the 5s interval c-the distance traveled

when the sum of masses remains constant but the net force increases, what happens to the acceleration?

why should pulleys be moving freely?
A FISHING BOAT has a maximum speed of 3 m/s in still water. it is in a river that is flowing at 2 m/s.what can be the max and mini speed of the boat with respect to the river bank?