Useful Information: G = 6.67 x 10-11 N m2/kg2
1. Write 9.101 x 104 in decimal notation.
a) 9101. b) 0.9101 c) 0.0009101 d) 91010000. e) 91010.
2. Five gallons/sec = _________ pints/min (1 gal = 4 qt., 2 pt = 1 qt)
a) 600 b) 480 c) 37.5 d) 2/3 e) 2400
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3-5. A ball is thrown straight up with a speed of 30 m/s.
3. The maximum height the ball reaches is _____ m.
a) 91.8 b) 1.5 c) 30 d) 3.1 e) 45.9
4. The ball reaches its maximum height in _____ s.
a) 3.06 b) 1.53 c) 6.12 d) 4.68 e) 0.33
5. If the +y direction is vertically up, when the ball reaches its maximum height its
a) acceleration is negative and velocity is zero.
b) acceleration and velocity are negative.
c) acceleration and velocity are zero.
d) acceleration is zero and velocity is positive.
e) acceleration is positive and velocity is zero.
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6. A physics student throws two bricks from the top of Fawcett Hall. Brick A is thrown straight up with an initial speed vo, and brick B is thrown straight down with the same initial speed. If air resistance is negligible, when they strike the ground
a) A has greater acceleration.
b) B has greater acceleration.
c) A has greater speed.
d) B has greater speed.
e) A and B have same speed.
7. A butterfly moves with a velocity of 12.0 m/s. The x-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis must be
a) 33.7° b) 41.8° c) 53.0° d) 48.2° e) 30.0°
8. Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum is
a) smaller than 2. b) 2 m. c) 12 m. d) larger than 12 m. e) between 2 m and 12 m.
9. A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. Its initial speed was _____ m/s.
a) 7.35 b) 12.5 c) 39.8 d) 8.13 e) 13.1
10. A projectile is shot out of a canon with an initial velocity of 23 m/s directed 35° above ground level and lands 2.7 s later. The projectile travels _____ m.
a) 62.1 b) 75.8 c) 108.3 d) 50.9 e) 35.6
11. An object sits on a horizontal frictionless surface. A horizontal 16 N force is applied to the object, and it accelerates at 2 m/s2. The mass of the object is _____ kg.
a) 8 b) 32 c) 4 d) 78.4
12. Amy, who weighs 490 N, stands on a bathroom scale in an elevator that is accelerating upward at 4.0 m/s2. What will the scale read?
a) 980 N b) 690 N c) 200 N d) 490 N e) 290 N
13. The coefficients of friction for plastic on wood are µs = 0.5 and µk = 0.4. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?
a) 2.7 N b) 1.5 N c) 1.2 N d) 0.15 N
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14-15. An object is placed on a frictionless ramp inclined at 35 degrees above the horizontal.
14. If the mass of the object is 12 kg, the net force acting on the object in a direction parallel to the ramp is _____ N.
a) 55 b) 82 c) 96 d) 67 e) 118
15. If the object is replaced by a 24 kg object, the new object will experience an acceleration
a) of zero but same velocity as 12 kg object.
b) half that of the 12 kg object.
c) twice that of the 12 kg object.
d) equal to that of the 12 kg object.
e) of zero but twice velocity of 12 kg object.
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16. A child is sitting on horizontal turntable revolving at a constant 1.2 revolutions/sec. Which of the following forces CANNOT BE ACTING on the child?
a) Frictional force acting radially inward.
b) Normal force acting upward.
c) Centripetal force acting radially outward.
d) Weight acting downward.
17. A 1200 kg car traveling at 14 m/s on a level road rounds a curve with a radius 50 m. What is the minimum coefficient of friction between the tires and the road?
a) > 1.0 b) 0.40 c) 0.137 d) 0.095 e) 0.029
18. A 65 kg astronaut is tied to her 30,000 kg space ship by a 125 m long cable that is fully extended. What gravitational force attracts her to her space ship as it floats in outer space?
a) 1.8 X 10-11 N b) 8.3 X 10-9 N c) 1.04 X 10-6 N d) 1223 N e) 637 N
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19-20. A student does 670 J of work in sliding his initially stationary 7 kg backpack a distance of 12 m along a level floor.
19. If he exerts a force directed 300 above the horizontal, the magnitude of the force is _____ N.
a) 774 N b) 55.8 N c) 9280 N d) 64.5 N e) 670 N
20. If the floor is frictionless, velocity of the backpack after the 12 m displacement is _____ m/s.
a) 16 b) 13.8 c) 9.8 d) 4 e) 191
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