Mechanics | Relativity Answers

Which has a greater momentum: a heavy truck at rest or a moving skateboard?






Which has a greater momentum: a heavy truck at rest or a moving skateboard?
Both have zero momentum.
Both have the same momentum.
The moving skateboard.
The heavy truck at rest.

a conical pendulum has period of one second and its string makes an angle of 45 degree with the vertical.if the same pendulum is used as simple pendulum what will be its period?

A rope is hung at both ends from a horizontal beam, and a weight m is suspended from it. The left part of the rope exerts a force G at P, while the right part of the rope exerts a force H. Find the indicated quantities from the given data.

m = 50 kg
θ (theta) = 17°
Ø = 6°

|G| = ?
|H| = ?

a loaded cart has a total mass of 227 kg. If a 312-N force acting at an angle of 30degrees to the ground is applied, how much work is done in moving the cart 15 m?

2 blocks of masses m1=10kg and m2=5kg connected to each other by a massless in extensible string of length 0.3m and placed along the diameter of a turn table coefficient of friction=0.5 between surface of table and m1 and there is no friction between table and m2.the table is rotating with 10rad/s about the vertical axis.the mass m1 is at a distance of 0.124m from centre.1)if the masses are at rest,calculate the frictional force on m1.2)what should be the angular speed of table if the masses just start to slip?

You attach a meter stick to an oak tree, such that the top of the meter stick is 1.47 meters above the ground. Later, an acorn falls from somewhere higher up in the tree. If the acorn takes 0.311 seconds to pass the length of the meter stick, how high above the ground was the acorn before it fell (assuming that the acorn didn\'t run into any branches or leaves on the way down)?

A vector velocity v has components vx = 20 m/s and vy = -31 m/s. Find the magnitude and the direction of the vector. Give the angle with respect to the horizontal positive x- axis.

4)a block of mass m is placed on a smooth turntable at a distance of 20cm from the centre.
a string is tied to the block and its other end passed through a gole in the centre of the table.
A 2nd block of mass m is suspended from the free end of the string as shown in fig.
At what angular speed should turntable rotate
so that the block placed on it should remain at rest on its surface?

There is a cylinder on an inclined plane which has an angle of 'A' with x-axis.Prove that the minimum friction force required to roll the cylinder without slipping is "(2/3)Mg sin A".
'M' is the mass of the cylinder.'g' is the acceleration due to gravity.

A penny is dropped from a height of 50.0m. If the acceleration due to gravity is 9.8 m/s2 and air resistance is disregarded, what is the speed of the penny as it hits the ground?