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w) The cube of the distance
x) The first power of the distance
y) The square of the distance
z) It has no relation to distance
ANSWER: X -- THE FIRST POWER OF THE DISTANCE
242: An object is projected vertically upward near the surface of the earth. At the very top of its path, the object's velocity is zero, and its acceleration is:
w) 0
x) 9.8 meters per second squared DOWNWARD
y) 9.8 meters per second squared UPWARD
z) Depends on the mass of the object
ANSWER: X -- 9.8 METERS PER SECOND SQUARED DOWNWARD
243: Of the following choices, approximately how many times greater is the mass of a proton than the mass of an electron?
w) 200
x) 2000
y) 20,000
z) 200,000
ANSWER: X -- 2000
244: How many quarks make up a neutron?
ANSWER: 3Science Bowl PHYSICS
245: 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:
w) Aged more than the earthbound twin
x) Aged less than the earthbound twin
y) Aged the same as the earthbound twin
ANSWER: X -- AGED LESS THAN THE EARTHBOUND TWIN
245: Which of the following forces is non conservative?
w) Gravitational force
x) Electrostatic force
y) Sliding frictional force
z) Restorative force of a spring
ANSWER: Y -- SLIDING FRICTIONAL FORCE
246: 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)
247: 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
248: 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
249: 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
250: 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
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