A 4.0kg ball is moving at 6.0m/s directly toward a 2.0kg ball which is at rest. They collide and stick together. What is the velocity after the collison? vf=(m1v1+m2v2)/(m1+m2)

You are on a roller coaster and you are momentarily lifted out of your seat when dropped at the top of a very high hill. You feel weightless because

A student lifts her 42kg body 0.25meters in 2seconds. How much power is she exerting? (weight=mass x gravity) (P=Fd/t)

A positive charge attracts object X. A negative charge repels object Y. Object X is attracted to object Y. (alternation of positive and negative charges)

Demonstrate your knowledge of Coulomb's law if Q1 is 1.6 x 10^-13 C, Q2 is 1.6 x 10^-13 C, and d is 0.50 m (k = 9x10^9 N/m^2/C^2) (F=k•Q1•Q2/d^2)

A negative point charge placed at point A will move toward the right.

Suppose the value of one resistor is 40 ohms, and the value of the second resistor is 10 ohms. What is the equivalent resistance? Req = (R x R) / (R + R)

A circuit has a resistance of 2.0 ohms and a 24 V battery. What is the current?

The lines of magnetic field from a bar magnet for closed lines. By convention, the field direction is taken to be

Which is not a way to make an electromagnet stronger?

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