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Sample Second Exam - General Physics I - 2006 | PH 101, Exams of Physics

University of Alabama (UA)Physics

Material Type: Exam; Class: General Physics I; Subject: PH-Physics; University: University of Alabama; Term: Fall 2006;

Typology: Exams

Pre 2010

Uploaded on 07/28/2009

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koofers-user-vc4 🇺🇸

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PH 101-001 Sample Second Exam March 2006
P. B. Visscher
This is a closed-book exam; please put books and notebooks on the floor. Bubble in all
answers on the blue answer sheet. You may keep this test booklet – turn in only the blue
answer sheet.
Constants
Mearth = 6.01024 kg Mmoon = 7.261022 kg g = 9.8 m/s2G = 6.6710-11 Nm2/kg2
1. A baseball of mass 0.3 kg moving at 41 m/s has a kinetic energy of
(a) 14 J (b) 41 J (c) 120 J (d) 250 J (e) 500 J
2. Consider a system consisting of a mass
m1 on an inclined plane, connected by a
massless string over a massless and
frictionless pulley to a mass m2 that hangs
vertically, as shown in the figure. Using
the axis definitions shown to define
components of the accelerations a1 and a2,
the constraint that the length of the string
remains constant translates into
a) a1y = a1x
b) a1y = a2y
c) a1y = - a2y
d) a1x = - a2y
e) a1x = a2y
3. If the masses in problem 2 are equal
(m1 = m2 = m) and there is no friction, the acceleration a2y is
(a) Negative (b) Positive (c) zero
4. and its magnitude is (in m/s2)
(a) 0 (b) 0.98 (c) 1.4 (d) 4.2 (e) 5.6
5. If the coefficient of sliding friction is 0.3, the acceleration is
(a) +0.4 (b) 0 (c) -0.4 (d) -0.8 (e) -1.1
6. A 1000 kg car is moving at 10 m/s at the top of a 20.4 meter high hill. At the bottom
it is moving at 20 m/s. How much energy was lost to friction? Give the mantissa and the
exponent separately:
(a) 1.0 (b) 2.0 © 3.0 (d) 4.0 (e) 5.0
7. (exponent part)
(a) x100 (b) x101 (c) x102 (d) x103 (e) x104
8. The angular velocity (in radians/second) of the second hand of a
clock is
(a)0.02 (b) 0.1 (c) 0.2 (d) 0.3 (e) 0.4
m
2
y2
x2
x1
y1
m1
pf3

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PH 101-001 Sample Second Exam March 2006

P. B. Visscher

This is a closed-book exam; please put books and notebooks on the floor. Bubble in all answers on the blue answer sheet. You may keep this test booklet – turn in only the blue answer sheet. Constants Mearth = 6.0 1024 kg Mmoon = 7.26 1022 kg g = 9.8 m/s^2 G = 6.67 10 -11^ Nm^2 /kg^2

  1. A baseball of mass 0.3 kg moving at 41 m/s has a kinetic energy of (a) 14 J (b) 41 J (c) 120 J (d) 250 J (e) 500 J
  2. Consider a system consisting of a mass m 1 on an inclined plane, connected by a massless string over a massless and frictionless pulley to a mass m 2 that hangs vertically, as shown in the figure. Using the axis definitions shown to define components of the accelerations a 1 and a 2, the constraint that the length of the string remains constant translates into a) a1y = a1x b) a1y = a2y c) a1y = - a2y d) a1x = - a2y e) a1x = a2y
  3. If the masses in problem 2 are equal (m 1 = m 2 = m) and there is no friction, the acceleration a2y is (a) Negative (b) Positive (c) zero
  4. and its magnitude is (in m/s^2 ) (a) 0 (b) 0.98 (c) 1.4 (d) 4.2 (e) 5.
  5. If the coefficient of sliding friction is 0.3, the acceleration is (a) +0.4 (b) 0 (c) -0.4 (d) -0.8 (e) -1.
  6. A 1000 kg car is moving at 10 m/s at the top of a 20.4 meter high hill. At the bottom it is moving at 20 m/s. How much energy was lost to friction? Give the mantissa and the exponent separately: (a) 1.0 (b) 2.0 © 3.0 (d) 4.0 (e) 5.
  7. (exponent part) (a) x 100 (b) x 101 (c) x 102 (d) x 103 (e) x 104
  8. The angular velocity (in radians/second) of the second hand of a clock is (a)0.02 (b) 0.1 (c) 0.2 (d) 0.3 (e) 0. m 2 y 2 x 2 x 1 y 1 m 1
  1. A truck moving at 30 m/s on a highway applies its brakes as hard as possible without skidding. If the coefficient of friction between the tires and the road is 0.5, how far will it travel before stopping? (a) 15 m (b) 30 m © 61 m (d) 92 m (e) 184 m
  2. A 3 kg mass is suspended over the edge of a table on a string that passes over a pulley and is connected to a 4 kg mass that slides on the table, as shown. The tension in the string is measured to be 20 N. What is the acceleration of the masses? Take downward acceleration of the hanging mass to be positive. (a) 1.1 (b) 2.1 (c) 3.1 (d) 4.1 (e) 5.
  3. and the units of acceleration are (a) m/s (b) N (c) N/m (d) joules (e) m/s^2
  4. The coefficient of friction between the 4 kg mass and the table is (a) 0.10 (b) 0.13 (c) 0.16 (d) 0.19 (e) 0.
  5. A weightlifter lifts an initially stationary 100 kg barbell a distance of 1 m, exerting a constant force of 1500 N. The kinetic energy of the barbell at the end is (a) 520 J (b) 980 J (c) 1500 J (d) 1920 J (e) 2480 J
  6. A 2000 kg truck moving at 20 m/s rear-ends a stationary 1000 kg car. After the collision the truck is moving forward at 10 m/s. How fast is the car moving? a) 5 m/s (b) 10 m/s (c) 20 m/s (d) 30 m/s (e) 40 m/s
  7. What fraction of the initial kinetic energy was lost in the collision? (a) 0 (b) 0.1 (c) 0.25 (d) 0.5 (e) 0.
  8. The position of an object as a function of time is given by x(t) = 7 m + (5 m/s) t + (6 m/s^2 ) t^2. What is its velocity at t = 0, in m/s? (a) 2.5 (b) 3.5 (c) 5 (d) 6 (e) 7
  9. What is its acceleration, in m/s^2? (a) 5.0 (b) 6.0 (c) 7.0 (d) 10 (e) 12
  10. A roll of tissue paper of radius 6.0 cm is suddenly accelerated to an angular velocity of 20 rad/s. It subsequently decelerates uniformly, stopping when 3.0 m of paper has unrolled. How many radians has it turned? (a) 6 (b) 20 (c) 30 (d) 50 (e) 100 4 kg 3 kg Wireless, massless force sensor