N any ecosystem, the size of a population A. always stays the same. B. only depends on the population's reproductive rate. C. only depends on the amount of resources available. D. may change over time.

Two cars each have a mass of 1050 kg. If the gravitational force between them is 2.27 x 10-7N, how far apart are they? G = 6.67 x 10-11 N. (m/kg) 2

Why are you able to observe the Doppler effect on earth with sound waves but not with light waves?

Find the speed of a satellite in a circular orbit around the earth with a radius 4.03 times the mean radius of the earth. (radius of earth = 6.37*103 km, mass of earth = 5.98*1024 kg, g = 6.67*10-11 nm2/kg2.)

Whats the best statement about stress management is true?

Calculate the velocity of a 1650 kilogram satellite.

If a pilot pulls her 12.0 kg rollaboard suitcase along the ground with a force of 25. N for 10 M. The handle she pulls on makes an angle of 36.5 degrees with the horizontal. How much work does she do over the ten meter distance?

What happens to the density when water is poured into a empty glass?

A British newspaper was interested in whether groups of people who differed in social standing were treated differently when they complained to organizations about poor service they had received.

During combustion, a fuel's electromagnetic energy is converted into thermal energy.

Explain why glucose is important to a cell