A person standing on a bridge at a height of 115m above river drops a 0.250kg...

A person standing on a bridge at a height of 115m above river drops a 0.250kg rock. A). What is the rock's total mechanical energy at the time of release relative to the surface of the river? B). What are the rock's kinetic, potential, and total mechanical energies after it has fallen 75.0m? C). Just before the rock hits the water, What are its speed and total mechanical energy? D). Answer parts (A)-(C) for reference point (y=0) at the elevation where the rock is released.

Expert Solution

genius_generous answered 2 years ago

A stone is dropped into a river from a bridge at a height h above the...

A stone is dropped into a river from a bridge at a height h above the water. Another stone is thrown vertically down at a time t after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone? Give your answer in terms of the given variables and g.

1. A person standing on Earth drops a ball. At the same time, a person standing...

1. A person standing on Earth drops a ball. At the same time, a person standing at the bottom of a spaceship accelerating at 9.8m/s^2. In the absence of any significant field in deep space, drops a ball. What would these people observe 2. Research general relativity and problems with the theory. Identify two possible solutions to problems with general relativity and the behaviour of galaxies. Do the solutions seem plausible to you? Why or why not?

If a bridge is above a river approximately 10 miles from the sea with a bridge...

If a bridge is above a river approximately 10 miles from the sea with a bridge deck of 170m What type of concrete is should be used? will it be sulphate resistant concrete or high performance concrete or any other? What will the Eurocode exposure class be ? will it be XS1 or XD1? or something else? Will it be EN206/BS8500 type of concrete?

A person is bungee jumping. The bungee cord is attached to a bridge over a river....

A person is bungee jumping. The bungee cord is attached to a bridge over a river. At time t0, before the person jumps (and while she is at rest), the bungee cord is unstretched. At time t1, the cord is stretched and the person is moving downward at her maximum speed. At time t2, the person has fallen her maximum distance and the cord is stretched by its maximum amount. At t3, the person is moving back up toward the...

A stone is dropped into a river from a bridge 43.0 m above the water. Another...

A stone is dropped into a river from a bridge 43.0 m above the water. Another stone is thrown vertically down 1.44 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone?

A person drops a cylindrical steel bar (Y = 8.00 × 1010 Pa) from a height...

A person drops a cylindrical steel bar (Y = 8.00 × 1010 Pa) from a height of 3.20 m (distance between the floor and the bottom of the vertically oriented bar). The bar, of length L = 0.820 m, radius R = 0.00500 m, and mass m = 1.300 kg, hits the floor and bounces up, maintaining its vertical orientation. Assuming the collision with the floor is elastic, and that no rotation occurs, what is the maximum compression of the...

A person drops a cylindrical steel bar (?=9.0×1010 Pa) from a height of 1.00 m (distance...

A person drops a cylindrical steel bar (?=9.0×1010 Pa) from a height of 1.00 m (distance between the floor and the bottom of the vertically oriented bar). The bar, of length ?=0.73 m, radius ?=0.75 cm, and mass ?=1.70 kg, hits the floor and bounces up, maintaining its vertical orientation. Assuming the collision with the floor is elastic, and that no rotation occurs, what is the maximum compression of the bar?

An astronaut standing on the surface of Ceres, the largest asteroid, drops a rock from a...

An astronaut standing on the surface of Ceres, the largest asteroid, drops a rock from a height of 10m. It takes 8.06s to hit the ground. Calculate the acceleration of gravity on Ceres. Find the mass of Ceres, given the radius is 510km. Calculate the gravitational acceleration 50km from the surface of Ceres. a. Calculate the acceleration of gravity on Ceres. b. Find the mass of Ceres, given the radius is 510km. c. Calculate the gravitational acceleration 50km from the...

A 51.9 kg person is standing on a platform that is accelerating. If the person has...

A 51.9 kg person is standing on a platform that is accelerating. If the person has an apparent weight of 873.8 Newtons, what is the acceleration of the platform in m/s2? Assume upward is the positive direction for acceleration

A person wants to catch the bus. Standing on the side of the street, the person...

A person wants to catch the bus. Standing on the side of the street, the person sees the bus, 150 meters to the left appraoching at 24.6 m/s. The bus stop is located 50 meters to the right. Already, the bus is slowing-down at 1.45 m/s^2 so the person immediately begins jogging towards the bus stop at a constant 3.12 m/s. (a) Which one gets to the stop first, (b) how long must it wait for the other, and (c)...

Question