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Physics Final Exam
| Question | Answer |
|---|---|
| A military helicopter has rotor blades 3 m long and are rotating at 600 rpm. What is the tangential velocity of each blade tip? a) 99 m/s b) 188 m/s c) 33 m/s d) 66 m/s | b.) 188 m/s |
| A military helicopter has rotor blades 3 m long rotating at 600 rpm. What is the centripetal acceleration of the rotating blades? a) 7895 m/s2 b) 11844 m/s2 c) 14263 m/s2 d) 9648 m/s2 | b.) 11844 m/s^2 |
| A point on a bicycle tire, as the wheel makes 4 complete revolutions about an axis. Compare the linear and angular displacement. a) both are zero b) only the angular displacement is zero c) only the linear displacement is zero d) neither is zero | c.) Only the linear displacement is zero. |
| In order to test the physiological effects of a large acceleration, a person is strapped 4.4 m away from the axis of the machine that rotates at 40 rpm. How many times the acceleration of gravity will the centripetal force be? | 7.87. |
| If the mass of the earth increased with no change in the radius, your weight would: a) also increase b) decrease c) stay the same d) depends on the mass | a.) Also increase. |
| For the people inside an orbiting space shuttle, there is no force of earth’s gravity acting on them. This is: a) always true while in orbit b) sometimes true while in orbit c) always false d) cannot determine from the information given | c.) Always false. |
| Suppose that a rocket is orbiting a planet in a circular orbit. What direction is the acceleration of the rocket? a) tangent to the orbit and forward b) along the radius and outward c) along the radius and inward d) none of the above | c.) Along the radius and inward. |
| Two satellites are monitored as they orbit the Earth. Satellite X is eight times as far from the Earth’s center as is Satelite Y. What is the velocity of satellite X compared to the velocity of satellite Y? | b.) 0.35 times |
| An artificial Earth satellite is in an elliptical orbit has its greatest speed when it is at what location? a) Nearest the Earth b) farthest from the Earth c) between Earth and Moon d) between Earth and Sun | a.) Nearest the Earth, |
| A body is in equilibrium if it is: a) at rest only b) moving with constant velocity only c) moving with constant acceleration d) either at rest or moving with constant velocity | d.) Either at rest or moving with constant velocity. |
| The torque applied on an object is directly proportional to: a) the external force b) the distance from the pivot point c) the angle between force and distance d) all of the above | d.) All of the above. |
| A heavy bank door vault door is opened by the application of 300 N directly perpendicular to the place of the door and 80 cm from the hinges. What is the torque due to this force about an axis through the hinges? | b.) 240 N.m. |
| A grinding wheel with a moment of inertia of 2.0 kg.m2 has a net torque of 2.5 N.m applied to it. What angular acceleration does it experience? | c.) 1.25 rad/s2. |
| The total kinetic energy of a baseball thrown with a spinning motion is a function of...? a) linear velocity but not its rotational velocity b) rotational velocity but not its linear velocity c) both linear and rotational velocities d) neither | c.) Both linear and rotational velocities. |
| A bucket filled with water has a mass of 23 kg and is attached to a rope, which is wound around a 5 cm radius cylinder at the top of a well. What torque does the weight of water and bucket produce on the cylinder? | c.) 11.3 N.m. |
| What is the angular momentum of a bicycle wheel of I = 0.8 kg.m2, rotating at 250 rpm? | c.) 20.94 kg.m2.rad/s. |
| A ventilation fan with a moment of inertia of 0.034 kg.m2 has a net torque of 0.11 N.m applied to it. What angular acceleration does it experience? | a.) 3.2 rad/s^2. |
| If a net torque is applied to an object, that object will experience which of the following? a) a constant angular velocity b) an angular acceleration c) a constant moment of inertia d) an increasing moment of inertia | b.) An angular acceleration. |
| The dimensional equation for torque is: a) [ML2/T] b) [ML2/T2] c) [MT2/L2] d) [kg.m2/s2] | b.) [ML2/T2]. |
| In a large tank containing a liquid, the pressure at a given depth is a function of which of the following? a) depth b) surface area c) liquid density d) both a and c above | d.) Both a and c above. |
| What is the total force on the bottom of a 4 m x 8 m x 5m deep swimming pool due to the weight of the air and the weight of water? | a.) 4,800,000 N. |
| A stone is at the bottom of a pool. The buoyant force's equal to the: a. weight of the stone b. weight of water displaced c. sum of weight of stone and weight of the displaced water d. difference of weight of stone and weight of the displaced water | d.) Is equal to the difference between the weight of the stone and the weight of the displaced water. |
| By what factor is the total pressure greater at a depth of 850 m of sea water with a density of 1025 kg/m3 than at the surface, where pressure is 1 atmosphere? | b.) 86. |
| Bernoulli’s equation states that the sum of the pressure and energy per unit volume along a pipe ________ as the pipe diameter increases along the pipe in the direction of fluid flow? Increases, Decreases, Remains constant, or None, | Increases. c.) Remains constant as the pipe diameter increases. |
| A rock suspended by a weighing scale weighs 5 N out of water and 3 N submerged in water. What is the buoyant force on the rock? | 2 N. |
| An umbrella tends to move upward on a windy day principally because... | Air pressure is reduced over the curved top surface. |
| A piece if metal, with a density of 4.69 g/cm3 and a mass of 1500 g, is submerged in a container of oil, with a density of 0.7 g/cm3. What volume of oil does the metal displace? | a,) 320 cm^3. |
| The dimensional equation for the quantity, pressure, is: | b.) [M/LT^2] |
| By what factor is the total pressure greater at a depth of 850m of sea water than the surface, where pressure is on atmosphere? | b.) 83. |
| What is the period of a pendulum that has a frequency of 1.5 Hz? | c.) 0.66s. |
| The valve spring from an automobile compresses 1mm under a load of 240N. What is the spring constant? | b.) 240,000 N/m. |
| If a force of 50 N stretches a spring 10 cm, what is the spring constant of the spring? | b.) 500 N/m. |
| The kinetic energy of the bob on a simple pendulum swinging in a simple harmonic motion has its maximum value when the displacement is at what point in the swing? a) zero displacement b) ¼ the amplitude c) ½ the amplitude d) maximum amplitude | a.) Zero displacement. |
| Which one of the following quantities is at a maximum when an object in simple harmonic motion is at its maximum displacement? a) velocity b) potential energy c) kinetic energy d) frequency | b.) Potential energy. |
| A spring, with a spring constant of 120 N/m, will be stretched to what displacement by 60 N of force? | a.) 0.5 m. |
| Which of the following is NOT an example of simple harmonic motion? a) a ball bouncing on the floor b) A child swinging on a swing c) a piano string that has been struck d) A car’s radio antenna as it waves back and forth | a.) A ball bouncing on the floor. |
| For a mass on a spring in the vertical direction, the time for one complete oscillation depends on: a) The value for the acceleration due to gravity b) the distance the mass was originally pulled c) the maximum speed of the mass d) none. | c.) The maximum speed of the oscillating mass. |
| The equation of a simple harmonic motion of a particle is given as: X= sin 2t. What is the amplitude of of the motion? a) ¼ b) ½ c) 1 d) 2 | c.) 1. |
| A vertical Hooke’s law spring extends 15 cm when a 2.5 kg mass is attached to it. What is the period of vibration of the mass? | b.) 0.78 s. |
| A simple pendulum has a length of 3.5 m. How many oscillations will this pendulum have in a interval of 2s? | d) 0.53. |
| If the frequency of a wave is increased by a factor of 3 in a medium where the velocity's constant, which of the following is true? a. Amplitude is one third as big b. amplitude is tripled c. wavelength is one third as big d. wavelength is tripled | c.) Wavelength is one third as big. |
| The wavelength of a traveling wave is a function of which of the following? a. frequency b. velocity c. amplitude d. both a and b | d.) both a and b. |
| A traveling wave has a wavelength of 0.5 m and a speed of 20 m/s. What is the wave frequency? | c.) 40 Hz. |
| A musical tone, sounded on a piano, has a frequency of 410 Hz and a wavelength in air of 0.8 m. What is the wave speed? | c.) 328 m/s. |
| As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the tops of plants, sway back and forth. This is what kind of wave? a. transverse wave b. longitudinal wave c. polarized wave d. interference wave | b.) Longitudinal wave. |
| Suppose that a sound wave in a particular medium has a frequency of 10,000 Hz and a velocity of 1250 m/s. What is the wavelength of the sound? | a.) 0.125 m. |
| The frequency of a sound wave is 100,000 Hz. The frequency's doubled. How is the velocity of the sound wave changed? Velocity... a decreases to ¼ the original b decreases to ½ the original c remains unchanged d increase to 2xs the original. | c.) Velocity remains unchanged. |
| A sound wave from a stationary observer is bounced off an object approaching with a velocity. The reflected wave, to the original wave, has ______ frequency, _______ velocity. a. decreased, same b. same, same c. same, increased d. increased, same | d.) Increased frequency, same velocity. |
| Two organ pipes simultaneously emit notes whose fundamental wavelengths are 146 cm and 150 cm. What is the number of beats per second? | a.) 6.21. |
| A Doppler effect occurs when: a. a source of sound moves towards you b. a source of sound moves away from you c. you move away from a source of sound d. all of the above | d.) All of the above. |
| A traveling wave train has a wavelength of 0.5 m and a speed of 20 m/s. What is the wave frequency? | c.) 40 Hz. |
| A radio wave has a speed of 300,000 km/s and a frequency of 107.7 MHz. What is the wavelength? | d.) 2.78 m. |
| In a longitudinal wave the compressions and rarefactions travel in: a. The same direction b. Opposite directions c. perpendicular to each other d. Both a&b | a.) The same direction. |
| An electromagenetic wave is made up of which of the following oscillating quantities? a. Electrons only b. Electric fields only c. magnetic fields only d. Electric & magnetic fields | d.) Electric & magnetic fields. |
| What condition must be met with regard to a charged particle if it is in the process of emmiting electromagnetic radiation? a. Moves at constant velocit b. accelerates c. moves at the speed of light d. Moves parallel to uniform magnetic field | b.) Accelerates. |
| The electric field E, in an electromagnetic field wave is oriented in what direction with respect to its associated magnetic field, B? a. E parallel to B b. E anti-parallel to B c. E perpendicular to B d. E at 45 degrees angle to B | c.) E perpendicular to B. |
| The phenomenon used by police radar is which of the following? a. Absorption b. Resonance c. reflection d. refraction | c.) Reflection. |
| In a vacuum, radio waves, microwaves, and x-rays all have the same: a. Period b. Frequency c. wavelength d. Speed | d.) Speed. |
| Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens? a. Protons are removed from the rod b. Electrons are added to the rod c. The fur is also charged negatively d. The fur is left neutral | b.) Electrons are added to the rod. |
| Two point charges are 4 cm apart. They moveed to a new separation of 2 cm. By what factor does the resulting mutual force between them change? a. ½ b. 2 c. ¼ d. 4 | d.) 4. |
| An uncharged conductor is supported by an insulating stand. I pass a positively charged rod near the left end of the conductor, but do not tough it. The right end of the conductor will be: a. Negative b. Positive c. neutral d. attracted | b.) Positive. |
| A charge q is an electric field. Magnitude of charge & strength of the field are known. Also need... a. Space from q to charges. b. Space from q to charges being produced d. None c. Field is produced by point charges or parallel plates | d.) None of the above. |
| Two point charges each have a value of +30mC and are separated by a distance of 4.0 cm. What is the electric field at a point midway between the two charges? | d.) Zero. |
| The unit of electric potential, the volt, is equivalent to: a. (J)(C) b. J/C c. C/J d. (F)(C) | b.) J/C. |
| The unit of capacitance, the farad, is equivalent to which of the following? a. V/C b. (V)(C) c. J/V d. C/V | d.) C/V. |
| A 0.25μF capacitor is connected to a 400-V battery. Find the charge on the capacitor. | b.) 1.0x10-4C |
| The number of electric field lines passing through a unit cross sectional area is indicative of: a. Field direction b. Charge density c. field strength d. Charge motion | c.) Field strength. |
| Of the following substances, which one contains the highest density of free electrons? a. Hard rubber b. Iron c. amber d. glass | b.) Iron. |
| Which of the following best characterizes electrical conductors? a. Low mass density b. High tensile strength c. Electric charges move freely d. Poor heat conductors | c.) Electric charges move freely. |
| What of the following best characterizes electrical insulators? a. Charges on the surface don’t move b. High tensile strength c. Electrical charges move freely d. Good heat conductors | a.) Charges on the surface don’t move. |
| A repelling force must occur between two charged object under which conditions? a. Charges are of unlike b. Charges are of like signs c. charges are of equal magnitude d. Charges are of unequal magnitude | b.) Charges are of like signs. |
| If the distance between two point charges are tripled, the mutual force between them will be changed by what factor? | d.)1/9. |
| The constant k, which appears in Coulomb’s Law formula has a unit equal to which of the following? N.m/C b. N/C c. N.m^2/C^2 d. N/C^2 | c. N.m^2/C^2 |
| In what type of electrical circuit does the resistance stay constant throughout? a) parallel circuit b) series circuit c) complex circuit d) none of these | d.) None of these. |
| The current in a microwave oven is 7 A. If the resistance of the oven’s circuitry is 28 Ω what is the potential difference across the oven? | d.) 196 V. |
| Which shows how these rank in least to most resistance? a. insulators, conductors, semiconductors, superconductors b. semiconductors, superconductors, conductors, insulators c. superconductors, conductors, semiconductors, insulators d. none | c.) Superconductors, conductors, semiconductors, insulators. |
| In most cases, increasing the temperature of an object will _______ its resistance. a) decrease b) increase c) have no effect on d) nullify | b.) Increase. |
| A(n) ________ is a solution that conducts electricity. a) electrode b) voltage c) terminal d) electrolyte | d.) Electrolyte. |
| The amount of charge flowing through a cross-sectional area of a wire per unit of time is called: a) Voltage b) Power c) Resistance d) Current | d.) Current. |
| What stays constant in a series circuit? a) resistance b) current c) efficiency d) potential difference | b.) Current. |
| What stays constant in a parallel circuit? a) resistance b) current c) efficiency d) potential difference | d.) Potential difference. |
| You measure a 25-V potential difference across a 5-ohm resistor. What is the current flowing through it? | c.) 5A |
| A superdonducting wire’s chief characteristic is which of the following? a. An extremely great length b. A large cross sectional area c. An extremely high temperature d. No resistance | d.) No resistance. |
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OliviaRoark
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