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Unformatted text preview: Physics 1A, Quiz #1, 11 am class Before starting to answer questions bubble in your student ID# and test version number (A,B,C, or D on the bottom of
this quiz page on your scantron form. If you do not bubble in this info your quiz will not be graded. For numeric answers two significant digits is enough. More digits is also 0k. A small range of answers near the correct
answer will be accepted. Use scientific notation (with "E" to indicate a power of ten) when needed. Note, however, that
3.1E—2 and 0.031 will be accepted as the same answer. Mark a minus sign when needed to indicate a negative value. Name Turn in this test form with your scantron form and also have your ID card out and ready to be checked.
Using notes or books, or calculators which store notes or formulas is not allowed.
Talking or looking at other students’ tests is not allowed. 1) Which of the following statements is NOT true? 1)
A) Standard "81 units" for length, mass, and time are m, kg, and s B) A stopwatch (reading to 0.01 sec) would be more useful than a video camera (recording 30
frames per sec) for precisely measuring how long it takes a ball to drop 3 meters C) A millisecond is 1E3 s D) Physicists have developed ways to define time very accurately based on the radiation
properties of atoms E) None of the above statements are true 2) Which of the following statements are true? 2)
A) A higher value of accuracy means better accuracy
B) The accuracy of a measurement refers to how repeatable a measurement is
C) The precision of a measurement refers to how close the measured value is to the true value
D) A lower value of precision means better precision E) None of the above statements are true 3) Suppose the position of an object is given by x=5t2, where t=time. What is the acceleration 3)
at t=0? 4) The volume of a tennis ball is about 150 cm3. What is the volume of the tennis ball in cubic 4)
meters? 5) Which of the following statements are true of forces? 5) A) When you kick a soccer ball a "contact force" is exerted on the ball by your foot because atom:
in your foot repel atoms in the ball B) The strength of the gravitational force is proportional to the inverse of the mass of the object
C) The Weak force is the weakest of all four fundamental forces
D) The Strong force is responsible for friction E) None of the above statements are true 6) Suppose you exert a constant pushing force F:2 N in the +x direction on an object of mass 6)
3 kg for one second. Suppose there are no other forces acting on the object. What is the final
velocity of the object in m / s? A—l 7) What is the equation of motion for a ball near the surface of the Earth that has the force of gravity
pulling down (—x direction) and an additional constant force of 5 N applied in the upwards
direction (+x direction)? Call m=mass, azacceleration, v:velocity, X=positi0n, t=time, and g=9.8
m/s / 5. dx A _:_
)mdt 5mg D) F=—mg+5
E) None of the above 8) Suppose you have a small spherical bead moving slowly through water at room 8)
temperature in the —x direction. The radius of the ball is 1 mm, the velocity is 1 cm/ s, the mass is 0.1 g. What is the acceleration of the bead in m/s2 if ﬂuid drag force is the only
force acting on it? (Note: a is positive if pointing in the +x direction, negative if pointing in
the —x direction). 9) Suppose a piece of rubber has a spring constant of 1000 N / m and is stretched (extended in 9)
the +x direction) by 10 mm. What is the spring force in Newtons? Express the result as a
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 Fall '10
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