Quizzes from Scott Pratts Lectures

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Quizzes from Scott Pratts Lectures
1. The average velocityis greatesta) between A
and B b) between B and C c) between A and C
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(No Transcript)
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A football is thrown with a velocity v0 at an
angle of 45 degrees above the horizontal. Which
of the expressions for the distance of the throw,
D, is correct?
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2) Which statements are correct?Assume the
objects are static.
A) T1 must T2 B) T2 must T3 C) T1 must be
lt Mg D) T1T2 must be gt Mg

• A only
• A and B only
• A, B and C only
• All statements
• None of the statements

cos(10o)0.985 sin(10o)0.173
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1. What is your section number? 2. A wheel of
radius 7 m rotates at 300 rpm. What is the linear
speed of a point on the rim?

• 140p m/s
• 35/p m/s
• 70p m/s
• 300/p m/s
• 600p m/s

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• What is your section number?
• What is TR, the tension in the right-side
  cable?Given Mg 2400 Na) 400 N b) 600 Nc)
  800 N d) 1200 Ne) 3000 N

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cylinder
a

• What is your section number?
• In order of largest to smallest, list the objects
  according to their moment of inertia. All three
  objects have the same mass M which is uniformly
  distributed in the plane according to the green
  color.

block
2a

• Cylinder, big block, little block
• Little block, big block, cylinder
• Big block, little block, cylinder
• Big block, cylinder, little block
• None of the above

a
block
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1. What is your section number? 2. How many
calories are required to heat one liter of water
from 20 ºC to 30 ºC?

• 10, 000
• 20,000
• 23.45
• 50,000
• 320,000

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1. What is your section number? 2. In an effort
to reduce heating costs in his bunker, Dictator
Dan doubles the thickness of his concrete walls.
Which of the following is true?
a) The conductivity gets doubled b) The
conductivity is halved c) The R-value is
doubled d) The R-value is halved e) None of the
above
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1. What is your section ? 2. A massive copper
piston traps an ideal gas as shown to the right.
The piston is allowed to freely slide up and
down and equilibrate with the outside air. Pick
the most correct statement? A. The pressure is
higher inside the cylinder than outside. B. The
temperature inside the cylinder is higher than
outside the cylinder. C. If the gas is heated by
applying a flame to cylinder, and the piston
comes to a new equilibrium, the inside pressure
will have increased. D. All of the above. E. A
and C.
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Outside Air Room T, Atm. P
1. What is your section ? 2. A massive piston
traps an amount of Helium gas as shown. The
piston freely slides up and down. The system
initially equilibrates at room temperature, T
Ta 20 ºC (a) The gas is then slowly heated
until T Tb 100 ºC (b) A. Pa Pb B. Wab gt
0 C. Qab gt Wab D. All of the above. E. A and C.
Vocabulary Wab is work done by gas between a and
b Qab is heat added to gas
between a and b
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1. What is your section ? 2. You are designing
an ideal Carnot engine which will exhaust heat
near room temperature at T 27 ºC. If you want
the engine to be 75 efficient, what is the
minimum temperature of the heat reservoir? A. 27
ºC B. 127 ºC C. 327 ºC D. 627 ºC E. 927 ºC
DATA 0 ºC 273 ºK