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 describes both a positive impact and a negative impact associated with the effects of nitrogen-enhanced fertilizers?

The earths gravity is pulling on you are you pulling on the earth

Which is related to air pollution in Mexico City? A. burning fossil fuels B. using hydropower C. collecting natural gas D. using biofuels

Explain the changes in kinetic and potential energy that occur when using newton cradle

What is the ratio of escape speed from earth to circular orbital speed? ignore air resistance.

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?

A satellite on a Low Earth Orbit is flying with a speed of 7.65 km/s. The vertical component of the Earth's magnetic field is 35.3 μT at the current location of the satellite.

A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day. How much energy does the air conditioner use during that day?

Hich of the following needs is an addition to Maslow's original hierarchy and only appears in the eight-stage revised model

What color of light can plants "see"?