Unit 8 Test

If we double the frequency of a system undergoing simple harmonic motion, which of the following statements about that system are true?

• The period is doubled.

• The wavelength is doubled.

• The amplitude is doubled.

• The period is reduced to one-half of what it was.

Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate?

• Raise the weight.

• Lower the weight.

• Add more mass to the weight.

• Remove some mass from the weight.

• Increase the amplitude of swing by a small amount.

In a classic TV commercial, a group of cats feed from bowls of cat food that are lined up side by side. Initially, there is one cat for each bowl. When an additional cat is added to the scene, it runs to a bowl at the end of the line and begins to eat. The cat that was there originally moves to the next bowl, displacing that cat, which moves to the next bowl, and so on down the line. What type of wave have the cats created?

• Standing wave

• Longitudinal wave

• Transverse wave

• Mechanical wave

• Feeding wave

A little league baseball coach picked up a new baseball bat for his team of Kindergartners to use for the game. While most of his players were successful using the team bat, some struggled to swing fast enough (as the bat was too heavy for them). As a coach, what advice should he give those struggling players?

• Slide their hands towards the end of the bat.

• Start their swing later.

• Scoot their feet up in the batter's box.

• "Choke up" on the bat (slide their hands towards the top of the grip and away from the end of the bat)

What is the frequency of the wave shown?

• 0.5 Hz

• 1 Hz

• 2 Hz

• 4 Hz

• It cannot be determined.

If guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?

• 250 Hz

• 750 Hz

• 1500 Hz

• 1750 Hz

A pendulum swings back and forth. How many times does it pass through the equilibrium position during one cycle of motion? Assume that the cycle begins when the pendulum is at maximum displacement from equilibrium.

• once

• twice

• three times

• four times

A grandfather clock keeps perfect time at sea level. If the clock is taken to a ski lodge at the top of a nearby mountain, what do you expect to happen to its ability to keep time?

• run slower

• run faster

• keep correct time

If a string fixed a both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate?

• 100 Hz

• 300 Hz

• 450 Hz

• 500 Hz

• 600 Hz

Which of the following is an example of frequency?

• 80 hours

• 3.00 x 10⁶ Hz

• 476 meters

• 5.05 cycles/second

• 6 seconds / cycle