Earth's magnetic field is generated by

gravitational forces at the poles

exchange of gases at the poles

the movement of electrical charges inside earth

chemical reactions in the van allen radiation belt

You must participate in minutes of physical activity, five days per week. A. 45 B. 20 C. 60 D. 30

Which equation correctly defines hookes law?

A charge particle moving through a magnetic field experiences a magnetic force. What is the angle between the magnetic field and the force on the particle?

Why do both the moon and earth pull on the spaceship the entire trip

A jet plane lands with a speed of 87 m/s and can accelerate at a maximum rate of - 4.10 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?

An approaching storm is moving at 15 km an hour what do you need to know to determine its velocity

How did astronomers precisely determine the length of an Astronomical Unit in the 1960s?

If a 1.50 kg mass revolves at the end of a string 0.50 m long, and its tangential speed is 6.0 m/s, calculate the centripetal force.

Balanced forces can change an object's direction. A. True B. False

The state of matter that has particles that slide by one another