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:  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

Q-7:  If an object is in a state of equilibrium, what can be said about all of the forces acting on the object?

ANSWER: THE SUM OF ALL FORCES ACTING ON THE OBJECT IS ZERO

Q-8: The pressure placed on a square with 1/2 meter sides is 1000 Pascals. How much force is being applied to the square?

ANSWER: 250 NEWTONS

Q-9: What is the ratio of a substance's density to the density of water called?

ANSWER: SPECIFIC GRAVITY (also accept relative density)

Q-10:  Which of the following is NOT closely associated with anon-magnetic Phase Diagram?

1) Eutectic Temperature (pron: you-tek-tik)
2) Curie Point
3) Solidus
4) Liquidus Curves
ANSWER:2 -- CURIE POINT

Q-11:  A bimetallic strip commonly found in home furnace thermostats works because of the difference in this property of the two metals. Is it:

1) thermal shock
2) thermal conductivity
3) thermal expansion
4) thermal diffusivity
ANSWER: 3 -- THERMAL EXPANSION

Q-12:  Which of the following physical properties is TRUE of most dense ceramic materials?

1) high tensile strength
2) good ductility
3) high compressive strength
4) high electrical conductivity
ANSWER: 3 -- HIGH COMPRESSIVE STRENGTH