Exam 2: Describing Motion: Kinematics in One Dimension

A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is 0.82 m long and open at both ends into its second overtone Resonance. What is the distance between a node and an adjacent antinode, in the string? The speed Of sound in air is 345 m/s.

A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator Moves upward with constant acceleration?

You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway. When the Vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you The frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 M/s)

An object having a fixed emissivity of 0.725 radiates heat at a rate of 10 W when it is at an absolute temperature T. If its temperature is doubled to 2T, at what rate will it now radiate?

You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be

When the current through a resistor is increased by a factor of 4, the power dissipated by the resistor

If a flower is 6.5 cm wide, its width expressed in millimeters is x mm, where x is

The captain orders his starship to accelerate from rest at a rate of How many days does it take the starship to reach 10 % the speed of light? (Light travels at

To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total Elapsed time of 4.1 s. How high is the pole above the point where the ball was launched? Neglect Air resistance.

A car with good tires on a dry road can decelerate (slow down) at a steady rate of about when braking. If a car is initially traveling at 55 mi/h (a) how much time does it take the car to stop? (b) what is its stopping distance?

The absolute temperature of an ideal gas is directly proportional to which of the following quantities?

A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?

If the electric potential at a point in space is zero, then the electric field at that point must be

Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?

A 34-kg child on an 18-kg swing set swings back and forth through small angles. If the length of the very light supporting cables for the swing is 4.9 m, how long does it take for each complete Back-and-forth swing? Assume that the child and swing set are very small compared to the length Of the cables.

A person consumes a snack containing 14 food calories (14 kcal). What is the power this food produces if it is to be "burned off" due to exercise in 6 hours? (1 cal = 4.186 J)

Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object.

An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s² and there is no air. To determine the depth of the crater, she drops a rock and measures the Time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater?

A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?

A race car circles 10 times around a circular 8.0-km track in 20 min. Using SI units (a) what is its average speed for the ten laps? (b) what is its average velocity for the ten laps?