Exam 2: Describing Motion: Kinematics in One Dimension

In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage Point of an observer at the top of the cliff leaning over the edge, the pitch of the scream as he falls Should be

A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the Roadside. What change of frequency does the observer hear?

A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)

Electrically neutral objects cannot exert an electrical force on each other, but they can exert a gravitational force on each other.

As a proton moves in a direction perpendicular to the electric field lines

At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?

The lowest tone to resonate in a pipe of length L that is closed at one end but open at the other end is 200 Hz. Which one of the following frequencies will not resonate in that pipe?

A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere), and after that the rod is also removed. The sphere is now

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis. (a) What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s? (b) What is the average speed of the particle between t = 1.0 s and t = 4.0 s?

Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the Speed of the ball at as it passed the top of the flagpole? Neglect air resistance.

The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?

A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible. (a) How long does it take the ball to reach the maximum height? (b) What is the maximum height reached by the ball? (c) What is its speed after 4.2 s?

The figure shows a graph of the velocity of an object as a function of time. What is the average acceleration of the object over the following time intervals? (a) From t = 0 s to t = 5.0 s (b) From t = 0 s to t = 8.0 s

You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz. You are relieved That he is in pursuit of a different driver when he continues past you, but now you perceive the Frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in Air is 343 m/s.

A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequency of 827 Hz between the sound it emits and the echo bouncing from the wall. What is the Speed of the bat if the speed of sound in air is 343 m/s?

An electronic component with a resistor is rated for use at power levels not exceeding 14 W. How much current can safely flow through the component?

An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration due to gravity on the planet?

If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period?

A) charge B) potential C) resistance D) resistivity E) capacitance

A rock is projected upward from the surface of the Moon, at time t=0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is and the Moon has no atmosphere. The height of the rock when it is descending with a speed of 20.0 m/s is closest to