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Physics Final
| Question | Answer |
|---|---|
| You are riding a bicycle at constant speed when you throw a ball vertically upward. It will land: | on your head |
| A certain object is at equilibrium. Which of the following is NOT true? | The object must be at rest |
| When the momentum of a moving object is increased, there must also be an increase in which one of the following of the object's properties? | kinetic energy |
| A car's speed 3 seconds after accelerating from rest at 2 m/s^2 is: | 6 m/s |
| A force of F results in an acceleration of a when acting on a mass m. If you triple the mass and increase the force by a factor of 6, what will the acceleration be? | 2a |
| Car A has a mass of 1000 kg and is moving at 60 km/h. Car B has a mass of 2000 kg and is moving at 30 km/h. The kinetic energy of Car A is: | twice that of Car B |
| At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately: | 40 m/s |
| Your mass on a planet where the gravity is 10 times greater than Earth's gravity is: | none of these |
| When Joshua brakes his speeding bicycle toa stop, kinetic energy is transformed to: | heat |
| The radius of a circle in which an object is moving at constant speed is doubled. The required centripetal force is: | 1/2 x as great as before |
| The average speed of a horse that gallops 10 kilometers in 30 minutes is: | 20 km/h |
| A boxer can hit a heavy bag with great force. Why can't he hit a piece of tissue paper in midair with the same amount of force? | The boxer can only hit the tissue paper with a force as large as the tissue paper can exert on the boxer, and the low-mass tissue can only exert a weak force. |
| A projectile is fired into the air at an angle of 50 degrees above ground level and hits a target downrange. It will also hit the target if fired at an angle of: | 40 degrees |
| A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the: | lighter car |
| A ball rolls off the edge f a table at the same time another ball drops vertically from the same table. .The ball that hits the floor first is the: | both hit at the same time |
| If you can't avoid being hit by a fast-moving object, you'll suffer a smaller contact force if you can make that force extend over a: | longer time |
| The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is: | 6 kg m/s |
| A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater: | momentum |
| Can something have a downward acceleration greater than 9.8 m/s^2? If "NO," why not? If "YES," give an example. | Yes, it would have to have a force other than gravity acting on it to make it accelerate greater than 9.8 m/s^2. An example might be a rocket shooting towards the earth. |
| If an object is in "free fall" (no air resistance) its velocity: | increases |
| If an object is in "free fall" (no air resistance) its acceleration: | stays the same |
| A 10-kg mass is held 1.0 m about a table for 25s. How much work id done during that period? | none |
| A monkey hangs from the ends of a rope as shown. On one side is a spring scale. How does the reading on the scale compare to the monkey's weight? | The reading is half the monkey's weight |
| In order to slide a heavy box across the floor at constant speed, you exert a force of 600 N. The force of friction between the box and floor is: | equal to 600 N |
| Under what circumstances, if any, is no work done on a moving object even though a net force acts upon it? | If it is centripetal force. |
| Several factors act on a moving object, yet no work is done on it. This is possible if the net force is: | equal to zero, perpendicular to the motion, and a cetripetal force. |
| A moving object whose initial KE is 10 J is subject to a frictional force of 2 N that acts in the opposite direction. How far will the object move before coming to a stop? | 5 m |
| A total of 490 J of work is required to life a body through a height of 10 m. Approximately what is its mass? | 5 kg |
| A truck slams on its brakes and comes to a halt in 100m. If the speed of the truck had been cut in half and the braking force remained the same, what would the stopping distance have been? | 25 m |
| In which of the following circumstances could mechanical energy not possibly be conserved, even if friction and air resistance are absent? | A car moves up a hill at a constant velocity. |
| In another solar system, a planet the same mass as Earth has three times the Earth's radius. Your weight on this planet is how many times your Earth-weight? | 1/9 |
| How much force is needed to push a nearly weightless but rigid 1.0 L carton beneath a surface of water? | 10 N |
| The brightness of a light in a parallel circuit will always be: | equal |
| When two objects attract each other electrically, must both of them be charged? | No. |
| When two objects repel each other electrically, must both of them be charged? | Yes. |
| A magnetic field does not interact with a: | stationary electric charge |
| Each of three objects carries a charge. Objects A and B attract each other. Objects A and C attract each other. Which of the following concerning objects B and C is true? | They repel each other |
| Voltage in resistors are equal in a _____________________ circuit: | parallel |
| When a 12 V battery powers a single 6-ohm lamp: | 24 joules flow in the lamp each second |
| The density of freshwater is 1.0 g/cm^3 and that of sea water is 1.03 g/cm^3. A ship will float: | lower in freshwater than in sea water |
| Two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be: | 16 N |
| An unstretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N clock makes the spring's length: | 70 cm |
| A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of : | 5 g/cm^3 |
| The source of all magnetism is: | moving electric charge |
| Electromagnetic induction occurs in a coil when there is a change in: | magnetic field intensity in the coil |
| Electrons flow in a wire when there is: | a potential difference across its ends |
| A block of wood floats in a tub of water. If this is repeated on the Moon, (in a pressurized lander, of course) how does the depth at which it floats compare to the depth on the Earth? | The depth is unchanged |
| Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it: | remains the same |
| The voltage across the input terminals of a transformer is 120V. The primary has 25 loops and the secondary has 50 loops. The voltage the transformer delievers is: | 240 V |
| What is the resistance of a 60-Watt, incandescent lightbulb? | 240 ohms |
| In a drawing of magnetic field lines, the weaker field is, the: | farther apart the field lines are |
| What is the speed of sound in dry air at 20 degrees celcius? | 340 m/s |
| Speaker A sounds 8 times as loud as speaker B. Which of the following would be a proper decibel rating for them? | Speaker A is 50 dB, Speaker B is 20 dB |
| A boat at anchor is rocked by waves whose crests are 30 m apart and whose speed is 6 m/s. These waves reach the boat with a period of: | 5 s |
| A radio signal takes 0.1 s to bounce off of a satellite and come back. How far away was the satellite at that time? | 1.5 x 10^7 m |
| A taunt string is attached to two rigid posts that are 5 cm apart. If a standing wave is to be set up in the string, which of the following would NOT be allowed? | 3 cm |
| Is diffraction more pronounces through a small opening of through a large opening? | Diffraction is more pronounced through a small opening |
| For an opening of a given size, is diffraction more pronounced for a longer wavelength or for a shorter wavelength.? | Diffraction is more pronounced for longer wavelengths. |
| Which of the following waves can NOT be refracted? | any waves can be refracted |
| Under what circumstances, if any, will a converging lens produce an erect image of a real object? | If the object is closer to the lens than the focal point. |
| Refraction is caused by a change in what wave property? | Speed |
| The quality in sound that corresponds to color in light is: | pitch |
| The range of (perfect) human hearing is about: | 20 Hz to 20 kHz |
| A listener is 100 m away from a pipe organ. Simultaneously, the organist presses three keys to produce tones of 200 Hz, 300 Hz, and 400 Hz. Compare the time it takes for each of these sound waves to reach the listener. | They reach the listener at the same time. |
| Which of the following would be the proper ranking for the waves on the basis of their wavelengths from largest to smallest? | Microwaves, red light, blue light, gamma rays |
| Which body glows with electromagnetic waves? | the moon, the Sun, you and your classmates |
| A blueberry will look black when illuminated with which of the following? | yellow light |
| If the frequency of a wave is 40 Hz, what is its period? | .025s |
| The energy of a photon depends on its: | frequency |
| If you triple the energy of a photon, what happens to its wavelength? | The wavelength will decrease by a factor of 3 |
| What color light is transmitted by a piece of blue glass? | blue |
| The amplitude of a wave is 1 meter. What is the crest-to-trough distance of the wave? | 2m |
| A 1056 Hz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string? | 1059 Hz or 1053 Hz |
| Terrestrial radiation is primarily in the form of: | infrared |
| Some of a wave's energy dissipates as heat. In time, this will reduce the wave's: | amplitude |
| Plane waves incident upon a barrier that pass through a small opening: | fan out |
| Relative to the normal at the location it hits, when a ray of light reflects off a mirror, the angle of reflection | is greater than the angle of incidence for a convex mirror, less than the angle of incidence for a concave mirror. |
| If the wavelength of a wave is tripled, what happens to the frequency of the wave? | The frequency if reduced by a factor of 3. |
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