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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 4 | A box is to be moved across a level surface. A force of magnitude 200 N may be applied at an angle of 30° below the horizontal to push the box or at an angle of 30° above the horizontal to pull the box, either application sufficient to overcome friction and move the box. Which application will cause the box to have the greater acceleration? | the one above the horizontal | |
| 6 | A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. If the block had been originally at rest and is free to move, what is its resulting speed? | 18 m/s | |
| 8 | The total kinetic energy of a baseball thrown with a spinning motion is a function of: | both linear and rotational speeds. | |
| 11 | The surface of the Sun has a temperature of about 5 800 K. If the radius of the Sun is 7*10^8m, determine the power output of the sun. (Take e = 1, and s = 5.67*10^-8 W/m&=^2×K^4). | 3.95*10^26 W | |
| 4 | As a car skids with its wheels locked trying to stop on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be: | less than the normal force of the road times the coefficient of static friction. | |
| 6 | A lump of clay is thrown at a wall. A rubber ball of identical mass is thrown with the same speed toward the same wall. Which statement is true? | The ball experiences a greater change in momentum than the clay. | |
| 8 | The quantity "angular momentum" (in terms of the fundamental quantities of mass, length, and time) is equivalent to: | ML^2T^-1 | |
| 11 | The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process? | conduction | |
| 4 | A 9.0-kg hanging weight is connected by a string over a pulley to a 5.0-kg block sliding on a flat table. If the coefficient of sliding friction is 0.20, find the tension in the string. | 38N | |
| 6 | Popeye, of mass 70 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700 kg (Bluto is very dense), who is charging in at 10 m/s. What was Popeye's speed? | 100 m/s | |
| 8 | A 100-N uniform ladder, 8.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.40. What minimum angle can the ladder make with the floor before it slips? | 51° | |
| 11 | Who demonstrated that when heat is gained or lost by a system during some process, the gain or loss can be accounted for by an equivalent quantity of mechanical work done on the system? | Joule | |
| 4 | A 2000 kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration? | 2.2 m/s^2 | |
| 6 | Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites, and they move apart. The satellites each have different masses with m1 < m2 < m3. Which of the following statements is always true? | Although one or more of the above statements could be true in special cases, they are not always true. | |
| 8 | A turntable has a moment of inertia of 3.0*10^-2 kg*m^2 and spins freely on a frictionless bearing at 25 rev/min. A 0.30-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable? | 0.91 |