A radio transfers 270 J of energy electrically, 94.5 J is transferred by sound. Work out the efficiency of this radio. Give your answer as a decimal.

Which of the following is not a type of current? A. direct B. conductor C. alternating

A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 82.4 mpa1m (75.0 ksi1in.).

In an insulated container, liquid water is mixed with ice. What can you conclude about the phases present in the container when equilibrium is established? There would be ice only. There would be liquid water only.

The horizontal component of force acting at an angle of 30 degree with the horizontal is 100N. Find the magnitude of the force and its vertical component.

What must differ between the atom of 2 different elements? protons in the atom electrons in the atom neutrons in the atom protons and neutrons in the nucleus

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.

Evaluate the force of a skateboard exerts on you if your mass is 60kg and you push on the skateboard with a force of 60N

Select all the expressions below which represent a 20% discount off the price of an item that originally costs d dollars. A. 0.8d B. d-0.2 C. d-0.2d D. 1-0.2d

Life cycle of a medium mass star