Today earths magnetic field is losing approximately 7 percent of its strength every 100 years. If the strength of earth magnetic field at its surface is 0.5 gauss today, what will it be 100 years from now?

A particle starts from the origin at t=0 with an initial velocity of 5.0 m/s along the positive "x" axis. if the acceleration is: a = (-3.0i+4.

What conditions are necessary for heat flow?

An object is dropped from a 15 m ledge. How fast it is moving just before it hits the ground?

Before World War II began, what two nations did not become the Axis Powers? Italy Germany France Soviet Union

Avi, a gymnast, weighs 40 kg. She is jumping on a trampoline that has a spring constant value of 176,400. If she compresses the trampoline 20 cm, how high should she reach? meters

The period of a simple pendulum is 3.8 s. the length of the pendulum is doubled. what is the period t of the longer pendulum? t = s

True or false - sound waves can travel across outer space.

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.