1.
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Consider a 2 kg Physics textbook pressed against a wall as shown in the animation (position is in meters and time is in seconds). Given that ms = 0.5 and that mk = 0.4 between the wall and the textbook, determine the force that is on the book perpendicular to the wall. Start
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| 39N |
| 49 N |
| 19N |
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2.
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Consider a 2 kg Physics textbook pressed against a wall as shown in the animation (position is in meters and time is in seconds). Given that ms = 0.4 and mk = 0.3 between the wall and the textbook, determine the force that is exerted on the book perpendicular to the wall. Start
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| 65.3N |
| 64N |
| 68N |
| 48N |
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3.
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A 20 kg block sits on a 150 kg block that is given a push as shown (position is in meters and time is in seconds). Determine the minimum coefficient of static friction between the two blocks. Start
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| ms > .11 |
| ms > .33 or equal to .33 |
| ms > .13 |
| ms = .33 |
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4.
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A 10.0 kg block sits on a 100 kg block as shown (position is in meters and time is in seconds). The surface between the bottom block and the table is frictionless. Given a push of F=50.0 N on the top block, determine the coefficient of kinetic friction between the top and bottom block. Start
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| .69 |
| .33 |
| .03 |
| 0 |
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5.
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A 5kg block is pulled to the right as shown in the animation (position is in meters and time is in seconds). The block is connected via a massless string and a massless pulley to another block m=1kg that sits on top of the larger block. Given a coefficient of kinetic friction of .3 determine the force of the pull. Start
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| 4.28 N |
| 8.28 N |
| 2.4 N |
| 5.34 N |
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6.
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A 5 gram coin is on a rotating turntable as shown (position is in meters and time is in seconds). Determine the magnitude and direction of the coin's acceleration at t=2 seconds. Start
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| a=1.23m/s2, towards the center. |
| There is no acceleration. |
| a=1.23m/s2, in the direction of the motion. |
| a=1.23m/s2, outward from the center. |
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7.
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A 5 gram coin is on a rotating turntable as shown (position is in meters and time is in seconds). Determine the minimum value of ms for this motion to occur. Start
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| ms =.126. |
| Friction is unnecessary. |
| ms =1.12. |
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8.
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ferris wheel A Ferris wheel rotates at constant speed as shown in the animation (position is in meters and time is in seconds). Each square represents a chair on the Ferris wheel. What applied forces act on a rider when the rider is at point (a), (x,y) = (0,-6)? Start
Interactive Hint
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| Normal force upward, weight downward |
| Normal force upward, weight downward, centripetal force upward |
| Normal force upward, weight downward, centripetal force downward |
| Normal force downward, weight downward, centripetal force upward |
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9.
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A coin is on a rotating turntable as shown (position is in meters and time is in seconds). Determine the direction of the coin's acceleration at t=2 seconds. Start
Look at a unitless representation of the linear speed: Interactive Hint
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| Always towards the center. |
| There is a deceleration tangent to the motion (to the left). |
| In the direction of the motion(to the right). |
| One component always towards the center and the other component to the left. |
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10.
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A mass is in a bowl as depicted in the above animation (mouse click in the animation for position given in meters and time is in seconds). At what point in the mass's motion is the normal force greatest? Why? Start
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| At the bottom. |
| At the top. |
| The normal force is the same everywhere. |
