MOTION
The term "uniform motion" means
a. acceleration is constant
b. displacement is constant
c. speed is constant
d. velocity is zero
e. velocity is constant
e. velocity is constant
A curling stone is sliding along the ice just after the curler has released it. Which of the following statements is true?
a. The frictional force is greater than the applied force which is acting.
b. The applied force is just equal to the frictional force.
c. The stone is moving with uniform motion.
d. The net force acting on the stone is supplied by friction.
e. The net force is zero.
d. The net force acting on the stone is supplied by friction.
A person lifts a pail of water of mass of 1.50 kg from the ground to a deck, 1.00 m above the ground. How much work was done by gravitational force on the pail of water?
–14.7 J
A transverse wave has an amplitude of 2.4 m. What is the vertical distance, in metres, between the top of a crest and the bottom of a trough?
4.8 m
The frequency of a sound wave is 50 Hz. What is its period?
0.02 s
The area under a velocity-time graph always represents
displacement
What is the weight of one metric ton?
a. one kilonewton
b. ten kilonewtons
c. one hundred newtons
d. ten newtons
e. one ton
b. ten kilonewtons
A boy decides to ignite caps from a toy gun in the following manner: He uses a magnifying glass to focus the sun's rays on a cap. It ignites with a loud bang. Which of the following energy transformations best describes the situation?
a. sound -> radiant -> chemical
b. sound -> chemical -> radiant
c. radiant -> chemical -> sound
d. chemical -> radiant -> sound
e. none of the above
c. radiant -> chemical -> sound
In an ideal wave, which of the following wave properties does not change as it travels along the same medium?
a. amplitude
b. wavelength
c. period
d. frequency
e. all of the above
e. all of the above
The speed of sound is most dependent on which of the following?
a. intensity of the sound wave
b. distance between the source and the observer
c. number of crests and troughs in the wave
d. medium in which the sound wave is travelling
e. frequency of the original source of the sound
d. medium in which the sound wave is travelling
A car drives 6.0 km [E], then 8.0 km [S] in a total time of 0.30 h. What is the car's average speed?
47 km/h
Your "weight" is properly defined as
a. the amount of material of which you are composed
b. the gravitational force which Earth exerts on you
c. the gravitational force you exert on Earth
d. the force you exert on a set of bathroom scales
e. none of the above
b. the gravitational force which Earth exerts on you
The amount of work done when a 80.00-kg person jumps 1.000 m into the air in 0.5000 s is
784.00 J
The three possible types of vibrations are
transverse, longitudinal, and torsional
One sound source has an intensity of 40 dB, while another has an intensity of 70 dB. The intensity of these two differs by a factor of
1000
Which statement describes the motion represented by a horizontal line on an acceleration vs time graph?
The object is moving with uniform motion.
b. The object has a constant velocity.
c. The object has a uniform acceleration.
d. The object is stopped.
e. The object has a changing acceleration.
c. The object has a uniform acceleration.
The weight of an object in free fall just above Earth's surface is
a. zero
b. less than normal
c. normal
d. greater than normal
e. almost zero
c. normal
A 15-kg load of groceries is lifted up from the ground to the fifth floor of an apartment building. Each floor is 5.00 m high. The potential energy of the groceries with respect to the second floor is
3.68 x 103 J
A 512-Hz tuning fork produces a sound wave with a wavelength of 68 cm. With what speed does the sound wave travel?
350 m/s
For every 10ºC increase in air temperature, the speed of sound in the air
increases by 6.0 m/s
If a person travels 2 km [E], 4 km [S], then 1 km [E], what displacement is required to return to their original position?
5 km [37° W of N]
If Earth was twice its present mass, but its size was not changed, you would weigh
twice as much
Two girls are playing baseball in a park. The batter hits the 400-g ball with a speed of 20.0 m/s. It travels over the park's fence that is 4.00 m high. Assuming that the ball loses half of its energy to air resistance, at what speed does the ball travel over the fence?
14.1 m/s
A water wave travels from shallow water to deep water and speeds up. Which of the following statements best describes the wave's behaviour as it changes mediums?
a. The wavelength is unaffected.
b. The frequency of the wave is lower in the shallow water and higher in the deeper water.
c. The wavelength is longer in the shallow water and shorter in the deeper water.
d. The wavelength is shorter in the shallow water and longer in the deeper water.
e. The frequency of the wave is higher in the shallow water and lower in the deeper water.
d. The wavelength is shorter in the shallow water and longer in the deeper water.
The frequency produced by a vibrating string is 800 Hz. What will its frequency be if its tension is quadrupled?
1600 Hz