The force resisting the motion of a car is proportional to the square of the car's speed. The magnitude of the force at a speed of 20.0 m s⁻¹ is 800 N. What useful output power is required from the car's engine to maintain a steady speed of 40.0 m s⁻¹?

An egg of mass 25 g falls vertically downwards from the surface of a table which is 900 mm above the ground. Air resi…

(b) A beach ball is released from a balcony at the top of a tall building. The ball falls vertically from rest and re…

A rock of mass 40 kg is released from rest from a height of 20 m above the surface of a planet. The rock has a kineti…

A micrometer is used to measure the diameters of two cylinders. diameter of first cylinder = (12.78 ± 0.02) mm diamet…

A person of mass 60 kg stands on accurate bathroom scales, placed on the floor of an elevator (lift) which operates i…

A particle is in a uniform field. The particle experiences a force in the opposite direction to the field. In which t…