Mechanics | Relativity Answers

A 15 cm cube of aluminum is immersed in a beaker of water. Find the magnitude of the buoyant force acting on the cube.

1) A 1kg box starts up a 2 degrees incline with a speed of 5m/s. How far will the box slide up the incline if the coefficient of kinetic friction between the box and incline is 0.4
2) A disk starting from rest rotates about its central axis with constant angular acceleration.In 3s, it rotates 27 rad . During that time, determine a)the angular acceleration
b) The instantaneous angular velocity of the disk at the end of the 3s.

calculate the linear acceleration
http://oi58.tinypic.com/mczvyg.jpg

A 4kg ball having velocity (7i+6j) m/s collides and bounces off a wall with a velocity of (-3i+6j) m/s. The ball is in contact with the wall for 0.01 s.In unit-vector notation, what are a) the impulse and b) the average force on the ball from the wall?

A baby has a tantrum and throws itself down on the bed that is a distance of .3m below. She hits the bed in 1.5 seconds. What is the initial velocity?

A dog runs at 2.3m/s horizontally and is unable to stop before it falls off of the stairs 3 seconds later. How high from the ground is the stairs?

Object A with a mass of 2kg, a velocity of 7m/s and object B with a mass of 9kg and a velocity of -5 m/s are moving towards each other along the x axis.They collide and stick together after collision.Determine the kinetic energy lost during the collision.

1)A 1kg box starts up a 2 degrees incline with a speed of 5m/s. How far will the box slide up the incline if the coefficient of kinetic friction between the box and incline is 0.4
2)A disk starting from rest rotates about its central axis with constant angular acceleration.In 3s, it rotates 27 rad .During that time, determine a)the angular acceleration
b)the instantaneous angular velocity of the disk at the end of the 3s

A 4kg ball having velocity (7i+6j) m/s collides and bounces off a wall with a velocity of (-3i+6j) m/s. The ball is in contact with the wall for 0.01 s.In unit-vector notation, what are a) the impulse and b)the average force on the ball from the wall

calculate the linear acceleration
http://oi58.tinypic.com/mczvyg.jpg