The source of all magnetic fields is

-magnets

-electric currents

How does the mass of an object change when it acquires a positive charge?

A box is at rest with respect to the surface of a flatbed truck. the coefficient of static friction between the box and the surface is μs.

A bike has a momentum of 100 kg/ms as it heads north. what is its momentum in the easterly direction

A Thomson's gazelle can run at very high speeds, but its acceleration is relatively modest. A reasonable model for the sprint of a gazelle assumes an acceleration of 4.2 m/s2m/s2 for 6.5 ss, after which the gazelle continues at a steady speed.

What is the largest category in the periodic table? A) metals B) Metalloids C) Nonmetals D) Noble Gases

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.