A twin goes on a high speed space journey (near the speed of light) and returns to meet his twin who stayed on earth. At their meeting the traveling twin has:

Q-1;A twin goes on a high speed space journey (near the speed of light) and returns to meet his twin who stayed on earth. At their meeting the traveling twin has:

1) aged more than the earthbound twin
2) aged less than the earthbound twin
3) aged the same as the earthbound twin
ANSWER: 2 -- AGED LESS THAN THE EARTHBOUND TWIN

Q-2; Which of the following forces is nonconservative?

1) gravitational force
2) electrostatic force
3) sliding frictional force
4) restorative force of a spring
ANSWER: 3 -- SLIDING FRICTIONAL FORCE

Q-3; What is the potential energy of a 10 kilogram cube 500 meters above the ground?

ANSWER: 49,000 JOULES (accept 50,000 joules, uses g = 10m/s2)

Q-4; Short Answer: A 2 kilogram mass accelerates at 5 meters per second squared for 3
seconds. What impulse has acted on the mass?

ANSWER: 30 NEWTON-SECONDS or 30 KILOGRAM-METERS PER SECOND

Q-5; The driveshaft of a car rotates at 450 radians per second with a torque of 150 Newton-meters. How much power is produced?

ANSWER: 67,500 WATTS

Q-6;  What is the initial velocity of an object if it is moving 10 meters per second after 2 seconds with a constant acceleration of 4 meters per second squared?

ANSWER: 2 METERS PER SECOND