A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is

A.

2.7 Ns, up.

B.
2.7 Ns, down.

C.
7.3 Ns, up.

D.
7.3 Ns, down.

E.
9.6 Ns, up.


Answer: D

Physics & Space Science

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A) All planetary orbits are ellipses. B) The square of the planet's period is equal to the cube of its average distance. C) A planet must move fastest in its orbit at perihelion. D) Epicycles are needed to explain the varying brightnesses of the planets.

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Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?

a. 57 mN b. 40 mN c. 69 mN d. 50 mN e. 20 mN

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