A TV has a power of 130 watts and an efficiency of 80 percent. How much

power is wasted as heat?

A. 104.0 W

B. 1.6 W

C. 26.0 W

D. 6.5 W

Jake boils some water to make a cup of tea. He uses a 5 kW kettle that takes 2 minutes to boil the water. a) Calculate how much energy Jake used, in kWh, to boil the water. Show your working.

What is nonuniform positive acceleration?

A car starts at rest. After 5 seconds the car is traveling at 40m/s. How far does the car travel in that time?

If you increase the mass of an object, but keep the force on it constant, its acceleration decreases? true or false

Which of the following best describes the momentum of two bodies after a two-body collision if the kinetic energy of the system is conserved? a. must be less b. must also be conserved c. might also be conserved d. is doubled in value

Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move.

What is the frequency of 20 mm microwaves? A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz E) 98 GHz

A measure of how much pulling, or tension, a material can withstand before breaking is - A. hardness. B. brittleness. C. tensile strength. D. malleability.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?