PHYS 105 Exam 1 Assessment Questions And Correct Detailed Answers.
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Module
EIND
Institution
EIND
Choose the unit of speed below that is the basic SI unit of speed.
a. Kilometers per hour
b. leagues per day
c. miles per hour
d. meters per second - correct answer d. meters per second
Suppose you are holding a meter stick, a ruler that is one meter long...
Choose the unit of speed below that is the basic SI unit of speed.
a. Kilometers per hour
b. leagues per day
c. miles per hour
d. meters per second - correct answer d. meters per second
Suppose you are holding a meter stick, a ruler that is one meter long, which is marked on one side in cm
and on the other side in inches. As you look at the cm side, approximately how many marks do you see?
Assume no marks smaller than a cm.
a. 30 marks
b. 1 mark
c. 1000 marks
d. 100 marks
e. 300 marks - correct answer d. 100 marks
Physics has many applications in the biological sciences. Choose the INCORRECT description of
application of physics in the biological sciences.
a. explains sensory phenomena involving sound waves and visible light
b. explains the dynamics of the human body
c. explains the processes that occur in our brain to form memories and feel emotions
d. medical diagnostic tools (X-ray, MRI, etc.) and treatments (radiotherapy) are based on phsyics.
e. helps describe the properties of cell walls and membranes - correct answer c.
explains the processes that occur in our brain to form memories and feel emotions
Consider a cannon that can fire a cannonball at a certain speed at angles ranging from 0-90 degrees
above the horizontal. If the initial speed of the cannonball remains the same as you vary the angle of the
cannon, at what angle do you need to fire the cannonball so that it will reach the maximum range
possible?
,a. 45 degrees
b. 90 degrees
c. 15 degrees
d. 75 degrees - correct answer a. 45 degrees
Consider physical scenarios given below and choose the situation in which the velocity is zero, but the
acceleration is not zero.
a. a ball that is thrown directly upward at the top of its trajectory
b. a car moving down a straight section of freeway at a constant speed of 60 mph
c. a car as it slows down to a stop, but before it has come to a complete stop
d. a ball that is thrown across the field at the top of its trajectory - correct answer a.
a ball that is thrown directly upward at the top of its trajectory
Which of the following situations describes where acceleration is zero?
a. speeding up or slowing down while moving
b. starting to move from rest
c. moving at a constant speed in a straight line
d. moving in a constant speed along a circle - correct answer c. moving at a constant
speed in a straight line
Your friend Sue claims that a car making a turn at a constant speed (of 40 mph, for example) is in fact
"accelerating," in the sense used in physics classes (like this one). Which explanation below mostly
correctly describes why your friend Sue is correct?
a. Sue is correct bc when a car makes a turn moving at a constant speed (of 40 mph), its velocity is
changing. An object is said to accelerate when its velocity changes
b. Sue is correct bc you have insufficient evidence to disprove her claim. In science, all claims are
presumed correct until proven incorrect and must be given a serious consideration
c. Sue is correct because when the car makes a turn, you feel the centrifugal force pushing you to the
outer edge of the turn. According to Newton's Second Law, F = ma, so you are accelerating due to the
centrifugal force
d. Sue is not correct. If a car moves at a constant speed (of 40 mph), then it is not speeding up - correct
answer a. Sue is correct bc when a car makes a turn moving at constant speed (of
40 mph), its velocity is changing. An object is said to accelerate when its velocity changes
, Which of the following is a valid unit for acceleration?
a. m/s
b. horsepower
c. m/s^2
d. m^2/s^2 - correct answer c. m/s^2
During a lecture demonstration, a professor places two coins on the edge of a table. She then flicks one
of the coins horizontally launching it off the table, simultaneously nudging the other just over the edge.
Which of these two coins hit the floor first?
a. the coin that is nudges just over the edge hits the floor first
b. the coin that is launched horizontally off the table hits the floor first
c. both coins hit the floor at the same time - correct answer c. both coins hit the
floor at the same time
Which of the following INCORRECTLY defines or describes "free-fall"?
a. if an object is moving upward, it cannot be considered to be in a free-fall
b. in free-fall motion, air and wind resistance are ignored.
c. objects in free-fall are being affected only by gravity
d. an object in free-fall is accelerating at gravitational acceleration - correct answer
a. if an object is moving upward, it cannot be considered to be in a free-fall
As two boys are playing in the outdoors, one boy hangs from a tree while the other boy aims a water
balloon cannon directly at him. Choose the statement below which most correctly predicts what will
happen in the next moment, depending on what the boy who hangs from the tree decides to do.
a. if the boy lets go off the tree the moment the water balloon is fired, the boy will avoid getting hit by
the water balloon, as the cannon was aimed directly where he was
b. if the boy continues to hold onto the tree, he will get hit by the water balloon, as the cannon is aimed
directly at him
c. if the boy lets go of the tree the moment the water balloon is fired, the boy will definitely get hit by
the water balloon, as the water balloon's trajectory curves downward along w/ the falling boy
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