Mechanics | Relativity Answers

calculate the momentum of the Titanic (m=4.2*10^7kg) moving at 14 knots (1kt=1.852km/h)

a 1300kg car moving north at 25 m/sec collides with a 2100 kg car moving east at 17 m/sec they stick together in what direction and with what speed do they move after the collision

A string under a tension of 43 N is used to whirl a rock in a horizontal circle of radius 3.3 m at a speed of 26.46 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.635 m long and the speed of the rock is 80.5 m/s, the string breaks. What is the breaking strength of the string? Answer in units of N.

when you have a rock on a string spinning it around, if you have a original tension with a radius and velocity, how would you find the breaking strength of a string if the problem also states a second radius and velocity but not the tension?

A 38 kg child on a 1.4 m long swing is released
from rest when the swing supports make an
angle of 21.2 with the vertical.
The acceleration of gravity is 9.81 m/s2 .
a) What is the maximum potential energy
associated with the child?
Answer in units of J

a lorry moving at constant 15 m/s passes a stationary car. after 3 seconds the car starts moving at an accelaration of 2.5 m/s squared in pursuit of the lorry. find the distance covered and time taken for the car to catch up with the lorry. also find the velocity with which the car overtakes the lorry.

If the shear stress in steel exceeds about 4.10 108 N/m2, the steel ruptures.
(a) Determine the shearing force necessary to shear a steel bolt 1.00 cm in diameter.

machanical work=__________ X distance

two wheels of moment of inertia 4 kgm^2 rotates sid by side at the rate of 120 rpm and 240 rpm respct. if now both the wheels are coupled by means of weightless shaft so that the wheels now rotates with a constant angular speed. find the new speed.

A rock with a mass of 6.0 kg is being whirled in a horizontal circle on the end of a rope 1.6m long. If the speed of the rock is 2.7m/s , what is the magnitude of the centripetal acceleration?