Mechanics | Relativity Answers

Romeo is chuckling pebbles gently up to Juliets window, and he wants the pebbles to hit the window with only a horizontal component of velocity. He is standing at the edge of a rose garden 4.5 m below her window and 5.0 m from the base of the wall. How fast are the pebbles going when they hit her window?

the platter of a computer hard drive disk rotates 5400 rpm. a) What is the angular velocity of the disk? b) If the reading head of the drive is located 3.0 cm from the rotational axis, what is the speed of the disk below it? c) What is the linear acceleration of this point? d) If a single bit requires 5um of length along the motion direction, how many bits/seconds can the writing head write when it is 3.0 cm from the axis?

An object is on a van's windshield that's inclined 30 degrees to the vertical. To what acceleration must the van move in order to keep the object there, neglecting all frictional forces including drag?

The work done in pulling up a block of weighing 2KN for a length of 10m on a smooth plane inclined at angle of 15 with the horizontal is

On the Apollo 15 space mission, Commander David R. Scott verified Galileo's assertion that objects of different masses accelerate at the same rate. He did so on the Moon, where the acceleration due to gravity is 1.62 m/s2 and there is no air resistance, by dropping a hammer and a feather at the same time. Assume they were 1.25 meters above the surface of the Moon when he released them. How long did they take to land?

The velocity of a particle is given by the equation V=4t^2+5.
(a)the average acc b/w the time interval t1=2s and t2=4sec
(b)the instatenous accerlation at t=4 sec

A particle projected from origin moves in x-y plane with a velocity V=3i+6xj, where i and j are the unit vectors along x and y axis. Find the equation of path followed by the particle

a small block of mass m lies on top of hemisphere of radiys R which is smooth. what minimum horizontal velocity block should be given so that it may not slide down along surface?

what are the contributions of Newton to physics?

Freddy Frog drops vertically from a tree onto a horizontally moving skateboard. The skateboard slows. Give two reasons for this, one in terms of a horizontal friction force between Freddy’s feet and the skateboard, and one in terms of momentum conservation.