What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

Which of the following does NOT describe the Image formed by a plane minor?

The density of 400cm3 of palm oil was 0.9gcm-3 before frying. If the density of the oil was 0.6gcm-3 after frying, assuming no loss of oil due to spilling, i...

A man walks 1km due east and then 1 km due north. His displacement is

Which of the following is true of an electrical charge?

What is the resultant resistance of the circuit in the image shown?

Natural radioactivity consists of the emission of

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

Cathode rays are