Aplane flying horizontally above earth’s surface at 100. meters per second drops a crate. the crate strikes the ground 30.0 seconds later. what is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? [neglect friction.]

What is the mass of the same rock on the earth

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.