Asmall toy cart equipped with a spring bumper rolls toward a wall with a speed of v . the cart rebounds from the wall, with the same speed v . the sketch below shows the initial velocity vector v⃗i , final velocity vector v⃗f , and the initial momentum vector p⃗i . using the initial momentum vector as a basis, draw the change in momentum vector δp⃗ for the cart.

the orientation and length of your vector will be graded. the location will not be graded.

What defines the mass number of an isotope? a. the sum of the neutrons and protons b. the sum of the neutrons and electrons c. the number of neutrons d. the number of protons

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?

What are the north and south poles of a solenoid change with?