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.

1. Impulse is the product of force and distance. True or false? 2. The force necessary to lift an object is g. True or false? 3. A joule is a newton times a second. True or false? 4. Work is done to lift an object in the classroom. True or false? 5.

A hockey player swings her hockey stick and strikes a puck. According to Newtons 3rd law of motion which of the following is a reaction to the stick pushing on the puck

A scientist collected data in 10 trials comparing tired students' and awake students' test scores. Trial Tired Average Score 1 34% 2 56% 3 60% 58% Awake Average Score 67% 88% 90% 86% Which trial was the least precise and is unlikely to be

Starting with only the Balmer series light (visible light), how could we ensure that the solar panels generate a current that Mark can use for his power station? A. By gradually increasing the brightness (amount) of light that we shine on it. B.

What do you mean by kintic theory of matter

One student did an experiment with salt water. The steps of the experiment are shown below. Pour half a cup of salt water into a pan. Keep the pan outside in the sun for a day. Allow all the water in the pan to evaporate.

The Wilson cloud chamber is used to study

Determine the horizontal and vertical components of a vector with a magnitude of 50 and a direction of 42° relative to the horizontal.

Newton's second law states that the force produced by a moving object depends on its mass and acceleration. Which is an example of this? A.

What is the speed of a 1200 kg car moving with a kinetic energy of 15 kJ?