A pulley system can

a. change the direction of a force.

b. multiply the force.

c. increase the amount of work done.

d. both a and b

e. both b and c

Which statement is true about the gravitational force? A. It acts on all objects all of the time. B. It only acts on objects that are in contact. C. It only acts on objects that are moving apart. D.

8. A boy pulls a 20.0-kg box with a 140-N force at 30° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.25 and the box is pulled a distance of 28.

The term pressure most nearly refers to which of the following? A. another term for density B. a property of water near the ocean bottom C. force per area created by the weight of water D. the pushing of ocean currents on objects in the ocean

Which is greater: an increase in temperature of 1c or an increase of 1f?

What is the approximate weight of a 400 kg object?

What would provide specific information about the materials in the equipment used in a certain experiment

The wavelength of sound wave is 30 m. Frequency is 7 Hz. What is the wave speed

The blood vessels that carry blood away from the heart to the rest of the body are

Mary has been playing an extreme form of dodge ball, where she has to stand on a board and try not to fall off as objects are thrown at her. Which of the following skills should she improve to do well at this game?

Examine the reactants of the incomplete double-displacement reaction. 2NaCl + H2SO4 → _[blank]_. What is the product of the double-displacement reaction?