(Elastic Collision - Conservation of Momentum): A 3000-kg truck moving right with a speed of 10.0 m/s
collides head-on with a 1000-kg car moving left with a
speed of 20.0 m/s. The two vehicles bounce off each
other and the truck moves left at 6.0 m/s. Determine
the velocity of the 1000kg car after the collision. (Do
NOT include units in your answer. Just put the number!)
m/s

What is hidden during a lunar eclipse? isn't the moon hidden?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?