What three things happen when air is warmed?

a) it expands

b) it contracts

c) it becomes lighter

d) it becomes heavier

e) it rises

f) it sinks

If Earth were to experience a runaway greenhouse effect, its atmospheric conditions would resemble those of which planet?

Muscles make up ore than __ of a person body? a. 10 b. 25 c40 d. 75

How fast or slow an object is moving and in what direction

Like matter, energy cycles continuously through an ecosystem. a. True b. False User: Like matter, energy cycles continuously through an ecosystem. True or False

A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. The cart starts out at the position x = 0 m, with an initial velocity of + 5.

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.

Distance divided by time what is velocity

The decay constant of a radioactive nuclide is 4.6 x 10^-3 s^-1. What is the half-life of the nuclide? 2.5 min 2.0 min 1.4 min 3.6 min 3.1 min

A furlong is an old british unit of length equal to 0.125 mi, derived from the length of a furrow in an acre of ploughed land. a fortnight is a unit of time corresponding to two weeks, or 14 days and nights.