How long do CFC molecules remain active in the stratosphere?

a. 10 to 50 years

b. 30 to 60 years

c. 60 to 120 years

d. 150 to 500 years

160 students sit in an auditorium listening to a physics lecture. Because they are thinking hard, each is using 125 W of metabolic power, slightly more than they would use at rest. An air conditioner with a COP of 5.

A bird sits on a branch. It takes off, accelerating at 1.1m/s/. If it travels for 2s, how far has it gone

A car travels at 60 mph for 10 hours. Calculate the distance it travels.

A bicyclist of mass 88.0 kg puts all his weight on each downward-moving pedal as he pedals up a steep road. Take the diameter of the circle in which the pedals rotate to be 0.

A student needs to use the metric system while measuring the length of a box. Which units should he use?

Explain Newton's First Law for the following. If you walk across the room holding a ball, when should you drop it to ensure that it lands on a target? Before, after or when you are directly on the target?

In what way are all forms of potential energy the same?

Enise is riding her bike and falls to the ground. During the collision, she hits both grass and cement. Which best explains why Denise had fewer injuries to the area of her body that hit the grass?

A rock is dropped into the Grand Canyon. It takes 18 seconds to hit the bottom. Calculate how deep the canyon is.

A change from one form of energy into another is called a. gravitational potential energy. b. work. c. conservation of energy. d. an energy transformation