A cyclist travelling along a straight level road accelerates at 1.2 m/s2 for 5 seconds. The mass of the cyclist and the bicycle is 80 kg
(a)
calculate the resultant force needed to produce this acceleration
Show clearly how you work out your answer and give the unit.
Resultant force =

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.