What are some of the causes that disrupt the natural balance of the ecosystem?

removing predators by hunting

overpopulation of predators

breeding hybrid plants

removing prey by transplantation

ridding the soil of decomposers

You're conducting a physics experiment on another planet. You drop a rock from a height of 2.1 m and it hits the ground 0.6 seconds later. What is the acceleration due to gravity on this planet? A. 7.0 m/s2 B. 9.8 m/s2 C. 11.7 m/s2 D. 5.

How much horsepower is needed to move a box that has a force of 1,492 n a distance of 2 meters in 1 second?

Object B is at rest when object A collides with it. The collision is one-dimensional and elastic. After the collision object B has half the velocity that object A had before the collision. Which object has the greater mass?

A coil of wire is comprised of 5 turns, has a current of 2 mA running through it, and a net magnetic field at its center of B is equal to start fraction mu naught over 40 end fraction times T. What is the radius of the coil of wire?

How many moles of gas must be forced into a 4.6 l tire to give it a gauge pressure of 31.2 psi at 26 âc? the gauge pressure is relative to atmospheric pressure. assume that atmospheric pressure is 14.

A book rests on a table, exerting a downward force on the table. the reaction to this force is:

Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are: a. 11 kHz b. 10 kHz c. 0 kHz d. 9 kHz

What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules

What happens to an object if the forces acting on it are unbalanced?

A 92-kg astronaut and a 2000-kg satellite are at rest relative to a space station. the astronaut pushes on the satellite, giving it a speed of 0.14 m/s directly away from the station.