Mechanics | Relativity Answers

mail A horizontal force of 45 newtons applied to a mass of 9 kilograms is just coefficient to move it if the body is now pulled at an angle of 50 to the horizontal, find the force required to move the body over the horizontal surface

a object is being rotated in a centrifuge which has a radius of 6.0m.If the acceleration of the centrifuge is 3 g, calculate the velocity of object and the time period of its motion.

A curve on a flat road has curvature radius 111 m, and a caution sign urges drivers to slow to 60 km/h before negotiating the curve.Find the minimum frictional coefficient safe for driving at this speed along the curve of the road.

Following the framework of Newtonian physics, suppose that that earth is
moving through the luminiferous ether at a speed v. Suppose that you are
Michelson (of the famous experiment) and that you have an interferometer
with two arms, each of length L as shown below. If one arm is directed
along the direction of the earth’s motion and one arm is directed in a
perpendicular direction,
i How long will it take a bit of light to make a complete circuit (out and
back) along each arm??
ii How big is the difference between these two times?

Air of 400kg was moving at 200/s pinged of the vein of a windmill every second.
A) At what rate in KW is the energy arriving in the windmill
B) What is the maximum mass of water that could be bumped each second through a vertical height of 5m?

A Glider with mass equals 0.2kg sits on a frictionless horizontal air track, connected to a spring of negligenble mass with force constant K=5.0N/M. You pull on the Glider stretching the spring 0.100m and then release it with no initial velocity. The Glider begins to move back towards its equilibrium position(S=0).
A) What is its speed when x=0.0800
B) What is the value of x when the object speed is 0.15m/s?

A car is travelling at a constant speed of 72 / km h and passes a stationary
police car. The police car immediately gives a chase, accelerating uniformly to
reach a speed of 90 / km h in 10 seconds. And continues at this speed until he
overtakes the other car. Find;
(i) The time taken by the police to catch up with the car,
(ii)The distance travelled by the police car when this happened.

Tom started chassing Jerry from the dinning table ran behind him for 16.2m toward south-west from there 2m toward the east .Then 9m toward north and then 2m toward east and finally he ran for 7m till the door in the north and caught Jerry .How far is the dinning table with respect to the door?

a ball thrown with velocity of 39.2m/s at a angle of 30` with the horizantal . calculat the maxium height and time flight

Two bodies A and B of equal masses moving with velocities (10km/s, 030°) and (15km/s, 090°) impinges and coalesced. Find the initial velocity with which the composite body begins to move immediately after the collision