Quiz 1

a car maintains a constant velocity of 100 km /hr for 1000 seconds. During this interval it's acceleration is A zero B 10 km /hr C 110 km /hr D 1,000 km /hr

A

a sailboat is moving at constant velocity, probably under motor. Inside the storage compartment, a wine bottle is dropped from the midpoint of the ceiling and Strikes the floor below. The bottle hits the floor A exactly below the midpoint of the ceiling. B ahead of the midpoint of the ceiling. C behind the midpoint of the ceiling. D more information is needed to solve this problem. E none of these

A

if your automobile runs out of fuel while you're driving, the engine stops but you Coast down a gradual stop. The concept that most explains why is A inertia. B gravity. C acceleration. D resistance

A

science, art, and religion do not contradict one another because A all three have different domains. B if you choose the right one, you can forget the other two. C if you choose religion and art, you can forget about science. D if you choose science, you can forget about religion and art

A

the maximum acceleration of a car while towing a second car of equal Mass, compared to its acceleration with no car in tow, is A one half B one third C one fourth D the same E none of these

A

while an object near the Mars's surface is in free-fall, it's A velocity increases. B acceleration increases. C mass increases. D Mass decreases

A

a scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypotheses, there must be a test for proving it A right B wrong

B

if a freely falling object near the Earth's surface Were Somehow equipped with a speedometer, its speed reading would increase each second by about A 5 m/s B 10 m/s C 15 m/s D a variable amount E depends on its initial speed

B

if a rocket initially at rest accelerates at a rate of 50 m/s^2 for 1 minute, its speed will be A 3600 m/s B 3000 m/s C 500 m/s D 50 m/s

B

if no external forces are acting on a moving object, it will A continue moving at the same speed but may change direction. B continued moving at the same velocity. C move slower and slower until it finally stops

B

a kilogram is a measure of an object's A weight B force C Mass. D size. E shape

C

a feather and a coin will have equal accelerations when falling from different heights in a vacuum because A their velocities are the same B the force of gravity is the same for each in a vacuum. C the force of gravity does not act in a vacuum. D the ratio of each object's weight to its mass is the same. E none of these

D

a man weighing 950 n stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is A 230 N B 400 N C 950 N D 475 N E none of these

D

when a rock thrown straight upwards gets to the exact top of its path, it's A velocity is zero in its acceleration is zero. B velocity is zero and its acceleration is about 10 meters per second per second. C velocity is about 10 m/s and its acceleration is zero. D velocity is about 10 m/s and its acceleration is about 10 meters per second per second. E none of these

B

a sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerk quickly. This best demonstrates that A the milk carton has no acceleration B there's an action-reaction pair of forces C inertia tends to resist movement the milk carton D the milk carton has lots of milk in it E none of these

C

the human body can, under certain conditions, withstand an acceleration of 10 g. What net force would produce this acceleration of a 50-kg person? A about 500 N B about 25,000 N C about 5000 N D about 2,500 N E any of these

C

the two measurements necessary for calculating average speed are A acceleration and time. B velocity and time. C time and distance. D distance and acceleration. E velocity and distance

C

whereas Aristole relied on logic in explaining nature, Galileo relied on A logic also B public acceptance C testing ideas by experiment D mathematics

C

which of the following is a scientific hypotheses? A the moon is made of unidentified elements. B there are things we should never know about. C matter is filled with undetectable particles. D there are parts of the universe that will never be found by man. E none of these

C

your weight is A 1 divided by your mass. B equal to your mass C the gravitational attraction force between you and the Earth. D a property of mechanical equilibrium. E depends on your height

C

an object in mechanical equilibrium is an object A at rest. B moving with constant velocity. C having no acceleration. D all of these

D

science is a body of knowledge that A describes order in nature. B is an ongoing activity of humans. C condenses knowledge into testable laws. D all of the above choices are correct. E none of the above choices are correct

D

the force of friction on a sliding object is 20 n. The applied force needed to maintain a constant velocity is A more than 20 N B less than 20 N. C 10 N D 20 N

D

the scientific method is most effective in A identifying questions. B making theories. Cdiscovering new things. D gaining, organizing, and applying new knowledge. E performing experiments

D

while a car travels around a circular track at a constant speed, it's A acceleration is zero. B velocity is zero. C inertia is zero. D none of the above

D

whirl a rock at the end of a string. If the string breaks, the tendency of the rock is to A continue to follow a circular path. B revolve in a smaller Circle. C increase its speed. D follow a straight line path

D