Which of the following objects exerts a gravitational force? a. the Sun b. an apple c. a basketball d. the Earth e. the Moon

What is the equation for calculating the heat energy released during heating effect of electric current?

What value would you divide 50 by in order to get grams to kilograms

The oven draws 1100 W of power, and you have determined that it heats with an efficiency of 51%. Using this information, determine the time t it would take to bring 240 mL of water from 25°C to 100°C. Note that 4.

Which of the following will be hardest to stop? O A. a horse moving at 6 mph O B. a baseball moving at 19 mph OC. an elephant at 5 mph OD. a hummingbird moving at 25 mph

If the work put into a lever is 25.0 joules and the work done by the lever is 20.0 joules, what is the efficiency of the lever?

A 2.50 * 105 W motor is used for 26.4 s to pull a boat straight toward shore. How far does the boat move toward shore if a force of 4.20 * 104 N is applied by the motor?

Which type of wave experiences a change in speed when entering a new medium? a) only sound waves b) both sound and light waves c) only light waves d) neither sound or light waves

Three basic classes of collisions include all but which of the following?

How does the use of biomass energy to create electricity harm the environment

Which physical property of iron made it popular for use in weapons? 1. Magnetism 2. Luster 3. Malleability 4. Ductility