Mechanics | Relativity Answers

A model rocket with a mass of 1.4kg is launched straight up at a speed of 43m/s.
4. What is its potential energy at the maximum height? 5. What is the rocket's maximum height? 6. What is the rocket's speed at a height of 47.17m?

A model rocket with a mass of 1.4kg is launched straight up at a speed of 43m/s. 1. What is the rocket's kinetic energy when it takes off? 2. What is the rocket's total energy when it takes off? 3. When the rocket reaches its maximum height, what is its kinetic energy?

A tennis ball is fired from a potato cannon with an initial speed of 100m/s at an angle of 37 degrees above horizontal. Write the initial velocity in component form (Vx, Vy)

The mass and diameter of a planet are twice those of the earth.what will be the period of oscillation of a pendulum on this planet,if it is a second's pendulum on the earth.

A 4.7 kg bag of groceries is in equilibrium on
an incline of 28. What is the magnitude of the normal force
on the bag?
Answer in units of N

A 45kg box is pulled across a horizontal floor. A rope attached to the box makes an angle of 30 degrees with the horizontal and the coefficient of friction between the box and the floor is 0.7. What is the tension in the rope in order to pull the box at a constant rate?

1. A 31kg crate in a warehouse is lifted 3.4m in the air by a forklift and placed on a shelf in a time of 3.8seconds. What work was done on the box by the forklift?
2. If the mass of the crate were tripled, and nothing else was changed, how much work would be required to lift the crate?
3. If the height of the shelf was halved, and nothing else was changed, how much work world be required to lift the crate?
4. If the time taken to lift the crate was doubled, and nothing else was changed, how much work would be required to lift the crate?
5. If the forklift lifted the crate to the height of the shelf and put it back on the ground, what is the work done by the forklift?

In order to make a split while bowling, it is determined that one of the pins needs to be hit and forced to move at a 70deg angle from the direction of the incoming ball. The ball's mass is 5times the pins mass. It is moving at 12 m/s when the ball strikes the pin. It can be assumed the collision is perfectly elastic, find the final speed of the ball and the pin and the ancgle at which the ball ends up moving.

An arrow shot on s flat surface at an angle of 57° at 95m/s, have to find range, time in air, max height, height after 10 secs, and what is the velocity at those 10 secs

Each ball has a mass of 2.5kg & you can throw each at a velocity of 10m/s. The board has a mass of 20kg. The first is a tennis ball & will bonce back at a velocity of 8m/s. The second ball is clay & will stick to the board. Show conservation of momentum