Q&A Hero

Physic

Q: If the velocity of an object is negative, a. its speed is decreasing b. its velocity does not exist c. it is reversing direction d. it is moving in the direction labeled negative
Q: Instantaneous speed and average speed are equal a. always c. for accelerated motion b. for motion at constant speed d. never
Q: GPS stands for a. the metric system of measurement b. grams per second c. Global Positioning System d. a space shuttle e. none of the above
Q: An aircraft approaches a runway that runs directly east as a strong wind blows out of the south. The direction that the aircraft should point in order to land on the runway is a. north b. east of north c. east d. south of east e. south
Q: Motion in a circle at constant speed is motion witha. constant acceleration b. constant velocity c. both of the aboved. none of the above
Q: An object moving in a circle undergoes a. constant acceleration b. free fall c. centripetal acceleration d. linear acceleration e. frequency
Q: The slope of a velocity vs. time graph is thea. distance b. velocity c. accelerationd. none of the above
Q: The slope of a distance vs. time graph is thea. distance b. velocity c. accelerationd. none of the above
Q: What is the period of a signal that has a frequency of 60 Hz?a. 60 s b. 60 s-1 c. 1/60 sd. not determinable
Q: A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is a. 0.5 s b. 2 s c. 5 s d. 10 s e. not determinable
Q: The time for one complete cycle of a periodic process to take place is called a. amplitude b. frequency c. period d. wavelength e. speed
Q: The number of cycles of a periodic process that occur per unit time is called a. amplitude b. frequency c. period d. wavelength e. speed
Q: In expressions like Dv and Dt, D stands for a. "change in" c. a constant of proportionality b. "triangle" d. a variable
Q: How many megabytes are there in a gigabyte?a. 10 b. 1000 c. 1000000d. none of the above
Q: Two microcuries is a. 200,000 Ci b. 0.0002 Ci c. 0.00002 Ci d. 0.000002 Ci e. 0.00000002 Ci
Q: Twenty kilometers is a. 200,000 m b. 20,000 m c. 2,000 m d. 200 m e. 0.02 m
Q: Fifteen microseconds is a. 0.0000015 s b. 0.000015 s c. 0.00015 s d. 0.015 s e. 15000000 s
Q: Twenty milliseconds is a. 0.00002 s b. 0.0002 s c. 0.002 s d. 0.02 s e. 20000 s
Q: The metric prefix that means one thousand is a. milli- b. centi- c. one- d. kilo- e. mega-
Q: What is the proper abbreviation for "˜grams?" a. g b. gms c. gm d. gr e. kg
Q: What is the proper abbreviation for "˜kilohertz?" a. kh b. khz c. Khz d. KHz e. kHz
Q: What is the proper abbreviation for "˜seconds?" a. sec b. There is none. It should always be spelled out. c. secs d. s e. none of the above
Q: Which of these are fundamental physical quantities?a. space, time, and matter b. kilograms, seconds, and meters c. length, time, and massd. momentum, energy, and mass
Q: A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is 5 m/s2.
Q: A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is 10 m/s2.
Q: A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is 8 m/s2.
Q: The acceleration after starting from rest is 8 m/s2.
Q: The velocity acquired after starting from rest is 8 m/s.
Q: The distance from the starting point is 16 m.
Q: When a body moves in circular motion at constant speed the velocity and acceleration point in opposite directions.
Q: As the ball is going downwards the velocity and acceleration both point down.
Q: At the peak of the motion the velocity and acceleration are both zero.
Q: As the ball is going upwards the velocity and acceleration both point up.
Q: The object's speed is greatest in region I.
Q: The object is never at rest.
Q: The object's acceleration is negative in region III.
Q: The object's acceleration is zero only in region II.
Q: The object's velocity is never negative.
Q: The object's velocity is positive in region II.
Q: The object's velocity is zero in region II.
Q: The acceleration of the moving object is a non-zero constant.
Q: The velocity of the moving object is a non-zero constant.
Q: The acceleration of the moving object is a non-zero constant.
Q: The velocity of the moving object is a non-zero constant.
Q: An aircraft approaches a runway that runs directly east as a strong wind blows out of the south. The direction that the aircraft should aim in order to land is east of north.
Q: A fast-moving body must have a larger acceleration than a slow-moving body.
Q: If an object's acceleration is positive, its speed must be increasing.
Q: An object moving in a circle undergoes centripetal acceleration.
Q: The slope of a velocity vs. time graph is the acceleration.
Q: The slope of a distance vs. time graph is the acceleration.
Q: A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is 2 s.
Q: Experimenting is part of the scientific method.
Q: The maximum possible speed in nature is the speed of light.
Q: The period of oscillation for a signal having a frequency of 60 Hz is 60 seconds.
Q: The time for one complete cycle of a periodic process to take place is called the period.
Q: The number of cycles of a periodic process that occur per unit time is called the period.
Q: The second is a metric unit of measure.
Q: There are one thousand megabytes in a gigabyte.
Q: Twenty milliseconds is 0.020 s.
Q: The metric prefix that means one thousand is milli-.
Q: The proper abbreviation for "˜kilohertz" is "˜kHz."
Q: The proper abbreviation for "˜grams' is "˜g."
Q: The proper abbreviation for "˜seconds' is "˜sec."
Q: If an object's velocity is constant, its speed must also be constant.
Q: If an object's speed is constant, its velocity must also be constant.
Q: The terms velocity and speed have identical meanings in physics.
Q: Uniform motion is any motion at constant speed.
Q: Motion in a circle at constant speed is motion with constant velocity.
Q: Motion in a circle at constant speed is motion with constant acceleration.
Q: Speed can sometimes be negative.
Q: A vector quantity has only a magnitude and no direction associated with it.
Q: Refraction occurs for both sound and light. When refraction occurs there is a change in 1) frequency. 2) wavelength. 3) speed. 4) all of the above. When sound travels faster near the ground than above, bending of sound tends to be 5) upward. 6) downward. 7) neither of these.
Q: Figure S-4 A supersonic aircraft flies between observers A and B as shown. The resulting sonic boom will soon be heard by 1) only observer A. 2) only observer B. 3) both A and B. 4) neither A nor B. The intensity of the sonic boom depends on the 5) speed of the aircraft. 6) size of the aircraft. 7) distance from the aircraft. 8) all of the above. 9) none of the above.
Q: Figure S-3 A V-shaped bow wave is produced when a boat moves 1) more slowly than the velocity of waves in the water. 2) as fast as the waves in the water. 3) faster than the velocity of waves in the water. 4) at any speed, slower or faster than the water waves. Which bow wave corresponds to the faster-moving boat? 5) I 6) II
Q: The aircraft that generates a shock wave will fly at 1) half the speed of sound. 2) exactly the speed of sound. 3) twice the speed of sound. 4) all of these. A sonic boom is produced by a missile traveling 5) near the speed of sound. 6) at the speed of sound. 7) only above the speed of sound. 8) near, at, or above the speed of sound.
Q: When a source of sound approaches, measurements will show an increase in the sound's 1) speed, 2) frequency, 3) wavelength, 4) all of these, 5) none of these, and when a source of sound recedes, measurements will show an increase in the sound's 6) speed. 7) frequency. 8) wavelength. 9) all of these. 10) none of these.
Q: If the handle of a tuning fork is held solidly against a table, its resulting sound is 1) louder, 2) softer, 3) doesn't change, and as a result of this, the length of time the fork keeps vibrating 4) increases. 5) decreases. 6) doesn't change.
Q: Compared to a soft sound, the speed of a loud sound is 1) less, 2) greater, 3) the same, and compared to low-frequency sound, higher-frequency sound travels 4) more slowly. 5) faster. 6) the same speed.
Q: Figure S-2 If these are sound waves, which corresponds to the highest pitch? 1) Wave I 2) Wave II 3) Wave III 4) Wave IV And which has the greatest wavelength? 5) Wave I 6) Wave II 7) Wave III 8) Wave IV 9) all have the same wavelength
Q: Figure S-1 Which wave has the greatest period of oscillation? 1) Wave I 2) Wave II 3) Wave III 4) Wave IV If the waves have the same frequency, which is going by with the greatest speed? 5) Wave I 6) Wave II 7) Wave III 8) Wave IV 9) all have the same speed
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