Mechanics | Relativity Answers

three particles A,B and C start from origin at same time A with velocity a along x- axis ,B with velocity b along y axis and C with velocity c in X-Y plane along line x=y.the magnitude of c so that three are always collinear is?

A roof tile falls from rest from the top of a building. An observer inside the building notices that it takes 0.20s for the tile to pass her window, which has a height of 1.8cm. How far above the top of this window is the roof

A coin has a weight of 100 grams and rotates on a horizontal disc with frequency of 1 hertz. The coin is at a distance of 10 cm from the axis of the disc. What is the frictional force that acts on the coin?
How much is the frictional force constant between the coin and the disc , when the coin is at 16 cm from the centre of rotation of the disc?

A cylinder of mass M and radius r rolls down a ramp at height of 2m above the ground and eventually takes off the ramp 20cm above the ground at an angle of 40degrees from the x-axis. Assuming the cylinder didn't slipped as it rolls down, calculate the horizantal range at which the cylinder landed on the ground.

Area is vectors or scalers?

Susan's 11.0 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30∘ above the floor. The tension is a constant 30.0 N and the coefficient of friction is 0.180.

Use work and energy to find Paul's speed after being pulled 3.10 m .

A car travelling at a speed of 60 m/s has 5040000 J of kinetic energy. Determine the mass of the car

A 1900 kg car moves along a horizontal road at speed v0 = 17.3 m/s. The road is wet, so the static friction coefficient between the tires and the road is only µs = 0.136 and the kinetic friction coefficient is even lower, µk = 0.0952. The acceleration of gravity is 9.8 m/s2 . Assume: No aerodynamic forces; g = 9.8 m/s2, forward is the positive direction. What is the highest possible deceleration of the car under such conditions? Answer in units of m/s2.

A 1900 kg car moves along a horizontal road at speed v0 = 11.3 m/s. The road is wet, so the static friction coefficient between the tires and the road is only µs = 0.15 and the kinetic friction coefficient is even lower, µk = 0.105. The acceleration of gravity is 9.8 m/s2 . What is the shortest possible stopping distance for the car under such conditions? Use g = 9.8 m/s2 and neglect the reaction time of the driver. Answer in units of m

a satellite moves in a circular orbit around a planet at a speed of 4400m/s.What is the orbital period?