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### 107 Cards in this Set

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 Probably the least amount of information about our environment comes to us through the sense of: A. touch B. smell C. hearing D. sight E. taste E. taste Our senses may obtain less than accurate information concerning our physical world because they: A. have a limited range B. all of these C. have limited sensitivity D. can be deceived. B. All of these A scientific law describes: A. a fundamental relationship of nature B. The scientific method C. the behavior of nature D. an experiment A. a fundamental reltaionship of nature A very tentative explanation of some regularity of nature is a(n): A. hypothesis B. scientific law C. experiment D. theory A. hypothesis A successfully tested hypothesis may take on the status of a(n): A. theory B. scientific law C. concept D. experimental result A. theory A standard unit: A. is only found in the British and metric systems B. may not be fixed in value. C. is the same in all systems of units. D. is used for taking accurate measurements. D. is used for taking accurate measurements The standard unit of times is the: A. minute B. day C. second D. hour C. second Which of the following is not a fundamental quantity? A. mass B. length C. time D. weight d. weight As a student, which fundamental quantity do you measure most often every day? A. time B. mass C. electric charge D. length A. time The mass of a cubic meter of water is: A. a cubic kilogram B. 100 kg C. 100 L D. a metric ton D. a metric ton Which state is incorrect: A. A kg has an equivalent weight greater than a lb. B. A m is longer than a yd. C. A km is longer than a mi. D. A L is larger than a quart C. A km is longer than a mi. Which of the following is not a standard metric unit? A. gram B. second C. kilogram D. meter A. gram The standard unit of length, the meter, is now defined with reference to: A. a meridian on the Earth B. a platinum-iridium bar C. the French metre D. the speed of light D. the speed of light The standard unit of time, the second, is now defined with reference to: A. the cesium-133 atom B. the Earth's revolution period C. The Earth's rotation period D. The mean solar day. A. the cesium-133 atom. The original standard kilogram, which is a platinum-iridium cylinder, is kept in A. France B. Germany C. England D. the United States A. France The meter was defined originally as: a. the length of a platinum-iridium bar B. one ten-millionth of one-half of a meridian C. on ten-millionth of the diameter of Earth D. the wavelength of a line in the spectrum of krypton-86 B. one ten-millionth of one-half of a meridian The metric prefix that means one-hundrdth (1/100) is: A. milli- B. centi- C. mega- D. kilo- B. centi- A cubic centimeter of pure water at maximum density has a mass of: A. 1 centigram B. 1 gram C. 1 kilogram D. None of these C. 1 kiliogram In the metric mks system of units, m is the symbol for: A. mass B. none of these C. metric D. meter D. meter Which of the following is a unit of mass density? A. kg/m3 B. lb/ft3 C. slug/ft2 D. g/cm2 A. Kg/m3 One kilogram is the same as: A. 0.001 g B. 1/1000 kg C. 1000 g D. 10,000 g C. 1000 g An object's weight would be different on the Earth and on the Moon. Which of the following would also be different? A. none of these B. density C. mass D. volume A. none of these An object transported from the Earth to the Moon has the A. same mass and same weight B. same mass, but different weight C. Same weight, but different mass D. different mass and different weight B. same mass, but different weight A hydrometer is used to measure A. liquid density B. water C. the volume of a quantity of water D. the time of an object to sink A. liquid density Which of the following is not a derived quantity? A. speed B. volume C. density D. mass D. mass The International System of Units (SI) has _____________ basic units A. 7 B. 5 C. 6 D. 4 A. 7 What is the mass of 25 cm3 of pure water? A. 25 mL B. 25 kg C. None of these D. 25 g D. 25 g A derived unit: A. involves only lenth B. only applies to density. C. is a combination of units D. is not found in the metric system C. is a combination of units A metric ton is: A. a mass unit B. a measure of density. C. the same as a British ton D. not defined A. a mass unit Which of the following quantities expressed in derived units includes the unit of length? A. density B. all of these C. speed D. volume B. all of these Density describes: A. volume per liter B. weight per mass C. length per unit time D. mass per unit volume D. mass per unit volume A relationship such as 1 in. = 2.54 cm is a(n): A. equivalence statement B. derived unit C. base unit D. equation A. equivalence statement A method of expressing the accuracy of measured quantities is: A. conversion factors B. derived units C. significant figures D. metric prefixes C. Significant figures Rounding the number 200.601 to three significant figures A. gives 200 B. cannot be done C. gives 201 D. gives 199 C. Gives 201 Expressed in powers-of-10 notation and rounded to four significant figures, the number 0.00023648 us A. 2364 x 10-6 B. 23.65 x 10-5 C. 236.5 x 10-4 D. 2.364 x 10-3 B. 23.65 x 10-5 One microgram contains how many grams? A. 10-9 B. 10-6 C. 10-12 D. 10-3 B. 10-6 One megawatt contains how many watts? A. 10-6 B. 10^3 C. 10^6 D. 10^9 C. 10^6 The speed of light in a vacuum is 300,000,000 m/s. Represented in powers-of-10 notation, this is: A. all of these B. 300 x 10^6 m/s C. 30 x 10^7 m/s D. 3 x 10^8 m/s D. 3 x 10^8 m/s A measurement of 0.00254 grams is the same as: A. 0.254 mg B. 25.4 mg C. 254 mg D. 2.54 mg D. 2.54 mg For the multiplication of 6.704m times 1.20 m, the result should be reported with how many significant figures? A. 4 B. 2 C. 1 D. 3 D. 3 When the measured quantity of 45.67 kg is divided by the measured quantity 3.42 L, the answer should have how many significant figures? A. 1 B. 4 C. 3 D. 2 C. 3 Motion necessarily involves: A. a change in position B. all of these C. a change in speed. D. a change in velocity A. a change in position The magnitude of a displacement, compared with that of a distance, is: A. greater than or equal to it. B. None of these; the two cannot be compared. C. always equal to it. D. less than or equal to it D. less than or equal to it Displacement divided by time gives: A. speed B. acceleration due to gravity C. velocity D. acceleration C. velocity When multiplying and/or dividing quantities, you should report: A. the result rounded to the number of digits as in the quantity with the least number of significant figures B. The result rounded as in the quantity with the greatest number of significant figures C. all the digits that show on your calculator D. only whole numbers A. the result rounded to the number of digits as in the quantity with the least number of significant figures Distance convered per unit of time is called: A. inertia B. velocity C. acceleration D. speed D. speed The straight-line distance and direction between two points is called: A. distance B. displacement C. velocity D. speed B. displacement The magnitudes two horizontal displacements are 6 m and 2m, respectively. Given that the vectors may be in either the plus or minus direction, the cannot be added together to give a total displacement of: A. -3 m B. 3 m C. 9 m D. 2 m D. 2m A speedometer idications__________________ if the automobile is traveleing forward A. instantaneous velocity B. average speed C. instantaneous acceleration D. instantaneous speed A. instantaneous velocity If an object moves with constant velocity, A. all of these B. its speed is constant C. its average speed is constant D. its direction is constant A. all of these The rate at which an object's velocity changes with time is called its: A. instantaneous velocity B. speed C. motion D. acceleration D. acceleration An automobile's acceleration may be changed by using the: A. radio B. steering wheel C. windshield wipers D. horn B. steering wheel Which one of the following is true for deceleration? A. the acceleration is zero B. the acceleration is necessarily negative C. The acceleration is in the direction opposite of the motion D. the velocity remains constant C. The acceleration is in the diection opposite the motion The distance traveled by an automobile moving at a constant velocity is: A. directly proportional to the time B. directly proportional to the time sqared C. inversely proportional to the time D. none of these A. directly proportional to the time An object that is moving in a linear path with an acceleration in the direction opposite has a(n) ___________________ velocity: A. decreasing B. constant C. increasing A. decreasing As a block slides down a 30º frictionless incline, its acceleration: A. decreases B. is greatest at the bottom of the incline C. increases D. remains constant C. increases A possible unit of acceleration is: A. m2/s B. m/s2 C. (m/s) x (s) D. m/s B. m/s2 If the veloxity of an object increases, we may be sure that during the time of this increase: A. None of these B. the acceleration of the object increases C. the object is moving in a straight path D. the object is accelerated D. the object is accelerated A freely falling object: A. has a uniformly increasing displacement B. has an acceleration that depends on its mass C. is unaffected by gravity D. has a uniformly increasing velocity D. has a uniformly increasing velocity An object in free fall has: A. an acceleration that depends on its mass B. a velocity that changes 9.8 m/s each second C. air resistance acting on it D. a constant velocity B. a velocity that changes 9.8 m/s each second An object with a mass of 2 kg is dropped. It takes 3s to hit the ground. Then an object with a mass of 4 kg is dropped from the same point. How long does it take to hit the ground? A. 6 s B. 1.5 s C. 3 s D. 9 s C. 3 s A car is moving down a freeway in a straight line at a constant rate of 25 m/s. Its acceleration is: A. zero B. 9.8 m/s C. 9.8 m/s2 D. 25 m/s A. zero A freely falling object has a contasnt acceleration of 9.8 m/s2. This means that: A. the object's displacement changes by 9.8 m every second squared B. the object's acceleration increases by 9.8 m/s2 each second C. the object's speed increases by 9.8 m/s each second D. the object travels 9.8 m each second C. the object's speed increases by 9.8 m/s each second An object that is moving with an acceleration different from zero will always have a(n) ____________________ velocity. A. increasing B. changing C. constant D. decreasing B. changing The distance traveled by a dropped object in free fall is directly proportional to: A. none of these B. its mass C. the time of fall D. the time of fall squared D. the time of fall squared Which of the following statements is not true? A. displacement has a direction and a magnitude B. Speed has a magnitude only C. Acceleration has a magnitude only D. Velocity has a magnitude and a direction C. Acceleration has a magnitude only All the following may be represented by vectors except: A. acceleration B. speed C. velocity D. displacement B. speed An object in univorm circular motion has: A. variable radial distances B. constant acceleration C. constant speed D. constant velocity C. constant speed In the equation ac=v2/r, the r stands for: A. rate B. distance C. radius D. diameter C. radius An object travels in a cicle of radius 3m with a constant speed of 4 m/s. What is the direction of its acceleration? A. normal to the plane of the circle B. insufficient data given for the determination C. tangential to the circle D. toward the center of the circle D. toward the center of the circle The magnitude of the acceleration of an object moving in a circle at a constant speed is: A. directly proportional to the velocity squared B. variable C. directly proportional to the radius of the circle D. directly proportional to the linear value of the velocity. A. directly proportional to the velocity squared If the speed of an object in circular motion is doubled, its centripedal acceleration for the same radius will be increased by a factor of: A. four B. three C. six D. two A. four A projectile's vertical velocity component: A. changes most rapidly near the bottom of its trajectory B. Changes at a constant rate C. does not change D. changes most rapidly near the top of its trajectory B. changes at a constant rate Ideally, a projectile's horizontal velocity component: A. changes most rapidly near the top of its trajectory B. changes most rapidly near the bottom of its trajectory C. changes at a constant rate D. does not change D. does not change A golfer hits a ball on a level fairway at an angle of 40º relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed, but at another angle, and it lands on the green by the other ball. What was the launge angle for the second golfer? A. 60º B. 30º C. 45º D. 50º D. 50º A basketball player when running and jumping to score seems to "hang" in the aire because: A. both components of motion are zero B. his acceleration is zero C. his vertical velocity is quite small D. his horizontal velocity is quite small C. his vertical velocity is quite small The essentials of the first law of motions were first developed by: A. an unknown scientist B. Newton C. Galileo D. Aristotle C. Galileo The natural tendency of an object to remain at rest or in motion with a constant velocity is called: A. an external force B. all of these C. inertia D. an unbalanced force C. inertia A mass is accelerated when __________________ acts upon the mass. A. an unbalanced force B. a balanced force C. any force D. none of these A. An unbalanced force Mass is a measure of: A. grams B. force C. inertia D. weight C. inertia Two equal and opposite forces of 5 N act on an object. The unbalanced force on the object is: A. 0 N B. cannot be calculated c. 10 N D. 5 N A. 0 N An automobile travles due north with a constant speed of 90 km/hr. The unbalance force acting on the auto with respect to the highway is: A. downward B. zero C. southward D. northward B. zero A constant net force acting on an object that is free to move will produce a constant: A. speed B. acceleration C. displacement D. velocity A. speed The acceleration produced by an unbalanced force acting on an object is: A. inversely proportional to the mass of the object B. directly proportional to the magnitude of the force C. in the direction of the force D. all of these D. all of these The SI base units making up the newton are: A. kg2-m/s B. kg-m/s2 C. kg-m/s D. kg/s2 B. kg-m/s2 When a net force on a moving object increases, the object will: A. have a change in speed and/or direction B. maintain a constant acceleration C. always show an increase in speed D. maintain the same velocity A. have a change in speed and/or direction Mass and weight on the Earth's surface: A. are defined by inertia B. are the same thing C. differ in magnitude by a constant D. are explained by the third law C. differ in magnitude by a constant A spacecraft in space keeps going at the same velocity, even without firing its rockets, in accordance with the ____________ law of motion. A. first B. fourth C. second D. third A. first If a person weighs 120 lbs on the Earth, her weight on the moon would be: A. 60 lbs B. 20 lbs C. 720 lbs D. 120 lbs B. 20 lbs Which of the following would be different for a person on the moon rather than on the earth? A. mass B. height C. inertia D. weight D. weight The relationship between mass and weight is given b the equation: A. m=wg B. w=mg C. g=mw D. w=m/g B. w=mg "For every action there is an equal and opposite reaction" is a statement of Newton's: A. Third law B. law of universal gravitation C. second law D. first law A. third law Newton's third law of motion states that the force pair acting on different objects consists of two forces that: A. are equal and in opposite directions. B. are under the influence of gravity C. are equal and in the same direction D. always produce an acceleration A. are equal and in opposite directions According to Newton's second law, the force required to accelerate an object is equal to its A. weight times the velocity B. mass times the acceleration C. mass divided by the velocity D. acceleration divided by its mass B. mass times the acceleration In the equation A=B/C, the A and C are _________________ proportional. A. not B. directly C. inversely C. inversely In the equation A=B/C, the A and B are ___________________ proportional. A. inversely B. directly C. not B. directly Newton's law of universal gravitation is believed to be applicable: A. throughout the universe B. on the Earth only C. to the Milky Way only D. on the Earth and Moon only E. to the solar system only A. throughout the universe "Weightlessness" occurs when an object: A. has zero acceleartion B. is midway between the earth and the moon C. is in free fall. C. is in free fall The constant G that appears in the equation F=Gm1m2/r2 is: A. a universal constant B. the acceleration due to gravity C. the force of gravity D. equal to g E. smaller on the moon than on the earth A. a universal constant The acceleration of an object acted on by a net force perpendicular to the direction of the object's original motion is: A. not covered by Newton's laws B. due to a change in direction C. a deceleration D. zero B. due to a change in direction To cause an object to go around in a circle, a(n) _________________ force must be provided. A. gravitational B. centripedal C. unbalanced D. inertial B. centripedal The linear momentum of a mass can be determined by taking the product of the mass and the A. acceleration of the mass B. velocity of the mass C. time that the mass moves D. distance that the mass moves B. velocity of the mass Momentum: A. has magnitude and direction B. none of these C. has the units of mass times acceleration D. is a scalar quantity A. has magnitude and direction The quantity mvr is an object's: A. linear momentum B. centripedal force C. torque D. angular momentum E. intertia D. angular momentum What must be exerted to change the angular momentum of a system? A. torque B. linear momentum C. force D. inertia A. torque The total linear momentum of an isolated system of masses remains the same if there are no external ________________ acting on the system. A. torques B. unbalanced torques C. forces D. unbalanced forces D. unbalanced forces The angular momentum of a body is constant if the: A. net force is constant B. net torque is zero C. net force is zero D. net torque is constant B. net torque is zero