Mechanics | Relativity Answers

an automobile travelling with a speed of 60km/hr ,can brake to stop within a distance of 20 m . if the car is going twice as fast ,i.e. 120 km/hr ,the stopping distance will be ?

A diesel locomotive of mass 30 tonne is travelling at 1.8 m/s when it couples with a series of coaches of total mass 350 tonne, whilst the coaches are stationary. Ignoring the effect of energy lost in the buffers and couplings, what is the speed immediately after impact of the whole train?

A motorcycle has a velocity of 40 m/s when the brakes are applied to bring it to rest in 3 s. If the road wheels have a radius of 0.45 m determine the number of revolutions made by the wheels in that time.

A cyclist starts from rest down a hill, of gradient 1 in 30. The gearing allows a constant tractive force of 180 N. The resistance to motion is 30 N. The total mass of cycle and cyclist is 85 kg. Calculate the constant acceleration in m/s2

a block(8.5kg) is fixed in aa frictionless incline plane by a rope. the angle θ= 30. what is thnormal force acting on the block.

A car of mass 120 kg is moving at 100 m/s. If it slows down to 40 m/s in 50 seconds:

A. The impulse and force that are being provided by the breaking mechanism is when the mechanism is brought to a stop and then “throw it back.” Impulses are greater when bouncing occurs.

An engine rotating at 2000 rev/min has a flywheel of 15 kg and radius of gyration of 300mm attached to it to smooth out the engine cycle. What energy is available from the flywheel at this speed in Joules?

A crank on an engine has rotating parts of mass 4.25kg, with a radius of gyration k = 59 mm. Determine the torque in Nm required to overcome the inertia of the rotating parts when angular acceleration is 36 rads/s2

A bus of mass 7.5 tonnes has a velocity of 72 km/h when the brakes are applied. The force of the braking system can be considered to be a constant 25 kN and is applied for 40 m. Determine the final velocity of the lorry in m/s.

A drinking fountain shoots water out from a height of 3.5cm above it's basin. The water follows a parabolic arc which extends 15cm horizontally before hitting the basin. The arc reaches a maximum height of 11cm above the basin. Determine: a) The time a single drop spends in the air. b) The initial speed of the water. and c)The angle at which it was shot out of the fountain.