Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Physics
Study Guide for Final Exam (consists of all of the tests)
| Question | Answer |
|---|---|
| A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun... | if the mass of the bullet equals the mass of the gun. |
| A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat can | then move in the direction of the wind impact force. |
| A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energ at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is | less than 100 J |
| The change in momentum, in kg m/s, that occurs when a 1.0 kg ball traveling at 4 m/s strikes a wall and bounces ack at 2 m/s is | 6. Remember Impulse (ft) = change in momentum (mv) |
| A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the | rifle has much more mass than the bullet |
| When a car is braked to a stop, its kinetic energy is transformed to | heat |
| A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identical...? potential energies, kinetic energies, inertias, momentum, none of these? | none of the above choices |
| The impulse (ft) - momentum (mv) relationship is a direct result of | Newton's 2nd law |
| A 1 kg chunk of puty moving at 1 m/s collides with and sticks to a 5 kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of.. | 1 kg m/s. Remember momentum (mv) before = momentum (mv) after |
| Two identical objects in outerspace have a head-on collision and stick together. If, before the collision, one had been moving at 2 m/s and the other at 1 m/s, their combined speed after the collision would be | .5 m/s. Remember momentum before = momentum after |
| According to the impulse-momentum equation Ft = change in mv, a person will suffer less injury falling on a wooden floor which "gives" than on a more rigid cement floor. The "F" in the above equation stands for the force exerted on the | either the force on the person or the force on the floor |
| A 1000 kg car and a 2000 kg car are hoisted the same distance. Raising the more massive car requires | twice as much work. Remember Work = force * distance |
| Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has | increased time of impact |
| A bullet has more kinetic energy than th erecoiling rifle from which it is fired is because the force on the bullet acts over a | longer distance. Remember net force * distance = KE |
| The power required to exert 1 N force, over a distance of 1 m in 1 second is | 1 W. Formula is Power = work done/time interval or P=fd/t |
| A "weightless" astronaut in an orbiting shuttle is | like the shuttle, pulled by Earth's gravitation |
| A lunar month is about 28 days. If the moon were farther from the Earth than it is now, the lunar month would be | more than 28 days |
| An Earth satellite is simply a projectile | freely falling around the earth |
| The amount of gravitational force that acts on the space shuttle while in orbit is | almost as much as the shuttle's weight on the Earth's surface. |
| Earth satellites are typically more than 100 km high (book says 150) so as to be above the Earth's | atmosphere |
| Inside a freely-falling runaway elevator, your | apparent weight is zero |
| An object is thrown vertically into the air. Because of air resistancde, the time for its descend will be | longer than the ascent time |
| A projectile is launched at ground level an angle of 15 degrees above the horizontal and lands down range. What other porjection angle for the same speed would produce the same down-range distance? | 75 degrees. Page 117 Projectiles Launched Horizontally. "The same range is obtained from two different launching angles when the angles add up to 90 degrees. |
| Communications and weather satellites always appear at the same place in the sky. This is because these satellites are | orbiting the Earth with a 24-hour period |
| When water is turned on in a shower the shower curtain moves towards the water. This has to do with | pressure of a moving fluid |
| What is the weight of water displaced by a 100 ton floating ship? | 100 tons. |
| There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which of the following is most likely? | The force on his finger would have been less than 1N |
| The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in | either the same or opposite directions |
| As a high-altitude balloon sinks lower and lower into the atmosphere, it undergoes a decrease in | volume |
| Atmospheric molecules do not fly off into outerspace because of | Earth gravitation |
| When holes are drilled through the wall of a water tower, water will spurt out the greatest horizontal distance from the hole closest to | the bottom of the tower |
| The pressure at the bottom of a jug filled with water does NOT depend on | surface area of the water |
| The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is | 4 degrees C |
| Ice tends to form first at the | surface of bodies of water |
| Heat energy travels from an object with a high | temperature to an object with a lower temperature |
| Consider a metal fring with a gap cut in it. When the ring is heated, the gap | becomes wider |
| A substance that heats up relatively quickly has a | low specific heat |
| Sue's refrigerator is built into the wall of her kitchen, so that it exhausts heat to the outdoors rather than into the room. If Sue tries to cool her kitchen by leaving the refrigerator door open, the room temperature will | decrease at least slightly |
| When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it | expands |
| Blow on your hand with your open mouth and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is | cooler |
| In science, a theory is | a synthesis of a large body of well-tested knowledge |
| In science, an educated guess is called a | hypothesis |
| Science is a body of knowledge that goes back to | humankind's beginnings |
| Of the sciences known as physics, chemistry, and biology, the most basic is | physics |
| The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world isknown as a scientific | theory |
| The scientific method is a method for | gaining new knowledge |
| In science, facts | may change |
| The chemical properties of matter come mostly from its | electrons |
| Solid matter is mostly empty space. The reason solids don't fall through one another is because | of electrical forces |
| What is the molecular mass of a water molecule? | 18 amu |
| Which of these atoms has the greatest number of electrons? helium, gold, uranium, carbon, or iron | uranium |
| Which of the following is not a mixture? air, cake, granite, beach sand, None. All of the above choices are mixtures | None. All of the above choices are mixtures |
| A force that determines the chemical properties of an atom is a | electrical force |
| Which of these atoms has the greatest amount of electrical charge in its nucleus? gold, iron, helium, uranium, or carbon | uranium |
| When carbon and oxygen atoms combine, energy is | given off by the reaction |
| A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then | 500 N. |
| A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration | decreases |
| A ball thrown straight upward takes 10 seconds to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is | less than 5 s |
| A coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is | greater on the coconut |
| A feather and a coin will have equal accelerations when falling in a vacuum because | the ratio of each object's weight to its mass is the same |
| A car maintains a constance velocity of 100 km/hr for 10 seconds. During this interval its acceleration is | zero |
| A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. How far below the level from which it was thrown is the rock 2 seconds later? | 9.8 m. (h= V(initial) * t - 1/2*g*t^2 4.9 * 2 - 1/2 * 10 (4) |
| A car accelerates at 2 meters per second per second. Assuming teh car starts from rest, how much times does it need to accelerate to a speed of 30 m/s? | 15 seconds. (V(final) = V(initial) + at) Will have to rearrange to get time. |
| A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water | is the same for each bullet |
| If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be | greater than the second before |
| A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is | zero |
| Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has the same? weight, mass, volume, all of these, none of these? | None of these |
| Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much? volume, mass, inertia, all of these, none of these? | all of these |
| A 10 kg block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is about | 50 N. Remember the formula f=ma & V=at. 1st find the acceleration by using & rearranging V=at. Then use the F=ma to find the stopping force. |
| A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car? | 1500 kg. Use formula F=ma rearranged |
| When a woman stands at rest with both feet on a scale, it reads 500 N. When she gently lifts one foot, the scale reads | 500 N |
| A force is a vector quantity because it has both | magnitude and direction |
| A 10 kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second per second is | 1. Use formula - (total) F = ma. 20N - 10 N = 10kg * a |
| If the mass of an object does not change, a constant net force on the object produces constant | acceleration |
| A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is | the same for both |
| Your friends says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair - no wall, no tricks. You | agree that it can't be done |
| A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is | the same for both |
| A vehicle that weighs 4000 N on the surface of the Earth is traveling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is | 4000 N. (F=ma & V=at?)??? |
| An airplane flies at 100 km/h in still air. If it flies into a 10 km/h headwind, its ground speed is | 90 km/h |
| A thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by | radiation |
| Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the average, have the same | kinetic energy, but more speed |
| Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be | the black surface |
| When liquids change to a solid state, they | release energy |
| Near the top of a mountain, water in an open pot boils at | a lower temperature than at sea level |
| Cold water will warm to room temperature faster in a? silver pot, black pot, depends more on size of the pots than their color | black pot |
| When wter vapor condenses on the inside of a window the room becomes slightly | warmer |
| The planet Earth loses heat mainly by | radiation |
| If you were caught in freezing weather with only a candle for heat, you would be warmer in? a wooden house, an igloo, a tent, a car? | an igloo |
| When a single charge q is at one corner of a square, the electric field at the center is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric field at the center of the square due to these three equal charges is | F/q |
| A highly charged child's balloon is not dangerous because? rubber is not a good conductor of electricity, its outside surface is positively charged, the potential difference between the balloon and the child's hand is very small, none of the above | non of the above choices are correct |
| Connect a pair of lamps in series and you draw current from the connected battery. Connect the same lamps in parallel and you draw | more current |
| Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have | less resistance |
| What is the resistance of a 120 W (1amp) incandescent lamp connected to a 120 V power supply? | none of the choices. Remember R = voltage/current so 120volts/1amp = 120 ohms |
| Compared to the filament thickness of a 60 W light bulb, the filament of a 100 W light bulb will be | thicker |
| The fundamental force underlying all chemical reactions is | electrical |
| Which statement is correct? A) current is the primary cause of voltage b) Resistance flows through an open circuit C) Voltage flows through an open or a closed circuit D) Charge flows in a closed circuit | Charge flows in a closed circuit |
| When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is | less than the resistance of either lamp |
| In an ac circuit, the electric field | changes magnitude and direction with time |
| The electrical force between charges depends only on the charges | magnitude and separation distance |
| A power line with a resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is | 12,800 W. formula - P = vc & to get the voltage its V=resistance * current. |
| The electric field inside the dome of a Van de Graaff generator? a) depends on the volume of the dome B) depends on the amount of charge the outside of dome C) Choices A & B D) none | none of the above choices are correct |
| Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the | same in each lamp |
| A circuit breaker of ten serves the same purpose as a | fuse |
| The ratio of the potential difference across a metallic conductor to the current in the conductor is known as | resistance |
| The intensity of cosmic rays bonbarding the Earth's surface is largest at the | poles |
| the output of an ideal transformer is | equal to the input power |
| The principal advantage of ac power over dc power is that | ac voltage can be transformed via conventional transformers |
| Which pole of a compass needle points to a south pole of a magnet | north pole |
| Magnetic compasses apparently were first used by | pigeons, then Chinese |
| A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondar coil is | 5 A |
| If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output | only while being connected or disconnected |
| Magnetism is due to the notion of electrons as they? A) move around the nucleus B) spin on their axes C) Choices A & B D) none | choices A & B. Move around the nucleus & spin on their axes |
| Outside a magnet, magnetic field lines are conventionally drawn from | north to south |
| Magnetic domains normally occur in | iron |
| When there is a change in the magnetic field in a closed loop of wire. A) a current is created in the loop of wire B) a voltage is induced in the wire C) electromagnetic induction occurs D) all of these E) none | All of these |
| Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is | burned out |
| A wave travels an average distance of 6 meters in one second. What is the wave's velocity? | 6 m/s |
| The least energy required to produce forced vibration in an object occurs | at its natural frequency |
| The loudness of a sound is most closely related to its | intensity |
| Refraction of sound can occur in | both air and water |
| The phenomenon of beats results from sound | interference |
| A fishing-boat captain returns to port saying "It's rough out there - the waves are 4 meters high." He probably means that the amplitude of the waves is | 2 meters |
| As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of its? A) frequency and wavelength B) loudness and wavelength C) loudness frequency, and wavelength D) loudness and frequency E) None of the choices | None of the choices are correct |
| High pitched sound has a high | frequency |
| Which doesn't belong to the same family? A) longitudinal waves B) ultrasonic waves C) radiowaves D) shock waves E) infrasonic waves | radio waves |
| A wiggle in time is a | vibration |
| The frequency of a simple pendulum depends on A) the acceleration due to gravity B) its mass C) its length D) all of these E) two of these | two of these. A) the acceleration due to gravity & B) its length |
| A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is | 10 m/s. 5*2/1 seconds |
| Sound refraction depends on the fact that the speed of sound is | variable |
Created by:
pkts68