Physics
(a) What should be the angle between the direction of force and the direction of displacement, for work to be negative? (b) Name the physical quantity obtained using the formula , where U is the potential energy and h is the height.
Related Questions
(a) What is the position of centre of gravity of a triangular lamina?
(b) When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
(a) Which force will produce maximum moment about A?
(b) Give a reason for your answer in (a).
Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2).
A metal foot ruler is held at the edge of a table. It is pressed at its free end and then released. It vibrates.
(a) Name the vibrations produced.
(b) State one way to increase the frequency of these vibrations.