PHYSICS 131 FINAL QUESTIONS AND ANSWERS
An object is vibrating with a frequency of 20 Hz, what is the period - Answers - 0.05 s
What is the acceleration of a 20 kg mass when pulled along a frictionless surface by a 2
N force - Answers - 0.1 m/s^2
What is the speed of sound in air on a very cold winter day when the temperature is
15.8F? - Answers - 326 m/s
An object travels at 10m/s for 3.5 hours, how far does it travel - Answers - 126 km
Two identical twins (same mass, height, etc) are standing on a dance floor. Twin a is
wearing a pair of high heels and twin b is barefoot. Which twin exerts more force on the
floor - Answers - the same
A sound wave in the air is observed to have a wavelength of 25cm in air at room
temperature, what is the frequency of this wave? - Answers - 1372 Hz
Which of the following is NOT a property of waves? Reflection, diffraction, conversion,
interference, refraction - Answers - conversion
Five waves with the following wavelengths (100,200,300,400,500cm) travel through a
hole, which exhibits the MOST diffraction - Answers - 500cm
In the 1920s, astronomer Edwin Hubble determined that the universe was expanding,
leading to the Big Bang theory. What wave property did Hubble use to determine
galaxies were moving away? - Answers - doppler effect
The body of a guitar is excited by the strings acting through the... - Answers - bridge
What pressure does a 2.5 kg book exert on the table is it has dimensions of 0.3m long
by 0.2m wide? - Answers - 408 Pa
The rms titanic sunk in the North Atlantic in 1912. The wreck was discovered in 1985
laying on the seafloor at a depth of approximately 3800m. What is the pressure (in
atmospheres) at this depth - Answers - 368 atm
A police car with a siren of 400 Hz is chasing a bank robber. The bank robber is driving
east at 30 m/s while the police car is chasing him at 60 m/s. What frequency would the
bank robber observe the siren to be? - Answers - 442 Hz
The Titanic sunk because it was unable to avoid an iceberg on a dark night. What
technology was invented after this disaster to help prevent similar accidents in the
future? - Answers - SONAR
, If you know your mass to be 50kg, on which planet would your weight be the most -
Answers - jupiter (g=24.8m/s^2)
While you are sitting outside you notice a police car driving away from you at 20 m/s.
You know its siren normal sounds with a frequency of 440 hz, but now it sounds about
415 hz. What is the temperature outside? - Answers - 1.1 celcius
The sound intensity in a room is measured to be 0.75 W/m^2 everywhere in the room.
There is a window in the room that measures 50 cm by 50 cm. How much sound power
flows through this window? - Answers - 0.1875 W
A firework explodes high in the sky. You know you are 400m away from the explosion
and you measure the sound intensity at your location to be 0.01W/m^2, how much
sound power does the explosion emit - Answers - 20096 W
You slide a mass of 2.5 kg into a mass of 5 kg, how much of the original energy does
the 5 kg mass obtain? - Answers - 89%
You shine a monochromatic light at glass (n=1.5), what percent of the light will reflect
(n-air=1.0)? - Answers - 4%
You are trying to add an anti-reflection coating to a pair of eyeglasses. You know the
index of refraction of air is 1.0 and the index of refraction for glass is 1.6. What should
the index of refraction of your coating be? - Answers - 1.26
Which of the following phenomenon is due to refraction? - Answers - mirage
Where would the water pressure be greater, in a small swimming pool with a depth of
2m or in a large lake at a depth of 2m? - Answers - the same
If the energy is flowing between two objects that have a large impedance mismatch,
most of the energy will... - Answers - reflect
An ocean wave observed to have a wavelength of 6m and a period of 2s, what is the
wave speed? - Answers - 3 m/s
In general, the speed of sound in air would be faster in the ___ than the ____ - Answers
- daytime, nighttime
A person slides a penny into another stationary penny, what percentage of the original
energy is reflected (i.e. By retained by sliding penny)? - Answers - 0%
A sound has a wavelength of 1.5 m, what is its frequency? - Answers - 229 Hz
An object is vibrating with a frequency of 20 Hz, what is the period - Answers - 0.05 s
What is the acceleration of a 20 kg mass when pulled along a frictionless surface by a 2
N force - Answers - 0.1 m/s^2
What is the speed of sound in air on a very cold winter day when the temperature is
15.8F? - Answers - 326 m/s
An object travels at 10m/s for 3.5 hours, how far does it travel - Answers - 126 km
Two identical twins (same mass, height, etc) are standing on a dance floor. Twin a is
wearing a pair of high heels and twin b is barefoot. Which twin exerts more force on the
floor - Answers - the same
A sound wave in the air is observed to have a wavelength of 25cm in air at room
temperature, what is the frequency of this wave? - Answers - 1372 Hz
Which of the following is NOT a property of waves? Reflection, diffraction, conversion,
interference, refraction - Answers - conversion
Five waves with the following wavelengths (100,200,300,400,500cm) travel through a
hole, which exhibits the MOST diffraction - Answers - 500cm
In the 1920s, astronomer Edwin Hubble determined that the universe was expanding,
leading to the Big Bang theory. What wave property did Hubble use to determine
galaxies were moving away? - Answers - doppler effect
The body of a guitar is excited by the strings acting through the... - Answers - bridge
What pressure does a 2.5 kg book exert on the table is it has dimensions of 0.3m long
by 0.2m wide? - Answers - 408 Pa
The rms titanic sunk in the North Atlantic in 1912. The wreck was discovered in 1985
laying on the seafloor at a depth of approximately 3800m. What is the pressure (in
atmospheres) at this depth - Answers - 368 atm
A police car with a siren of 400 Hz is chasing a bank robber. The bank robber is driving
east at 30 m/s while the police car is chasing him at 60 m/s. What frequency would the
bank robber observe the siren to be? - Answers - 442 Hz
The Titanic sunk because it was unable to avoid an iceberg on a dark night. What
technology was invented after this disaster to help prevent similar accidents in the
future? - Answers - SONAR
, If you know your mass to be 50kg, on which planet would your weight be the most -
Answers - jupiter (g=24.8m/s^2)
While you are sitting outside you notice a police car driving away from you at 20 m/s.
You know its siren normal sounds with a frequency of 440 hz, but now it sounds about
415 hz. What is the temperature outside? - Answers - 1.1 celcius
The sound intensity in a room is measured to be 0.75 W/m^2 everywhere in the room.
There is a window in the room that measures 50 cm by 50 cm. How much sound power
flows through this window? - Answers - 0.1875 W
A firework explodes high in the sky. You know you are 400m away from the explosion
and you measure the sound intensity at your location to be 0.01W/m^2, how much
sound power does the explosion emit - Answers - 20096 W
You slide a mass of 2.5 kg into a mass of 5 kg, how much of the original energy does
the 5 kg mass obtain? - Answers - 89%
You shine a monochromatic light at glass (n=1.5), what percent of the light will reflect
(n-air=1.0)? - Answers - 4%
You are trying to add an anti-reflection coating to a pair of eyeglasses. You know the
index of refraction of air is 1.0 and the index of refraction for glass is 1.6. What should
the index of refraction of your coating be? - Answers - 1.26
Which of the following phenomenon is due to refraction? - Answers - mirage
Where would the water pressure be greater, in a small swimming pool with a depth of
2m or in a large lake at a depth of 2m? - Answers - the same
If the energy is flowing between two objects that have a large impedance mismatch,
most of the energy will... - Answers - reflect
An ocean wave observed to have a wavelength of 6m and a period of 2s, what is the
wave speed? - Answers - 3 m/s
In general, the speed of sound in air would be faster in the ___ than the ____ - Answers
- daytime, nighttime
A person slides a penny into another stationary penny, what percentage of the original
energy is reflected (i.e. By retained by sliding penny)? - Answers - 0%
A sound has a wavelength of 1.5 m, what is its frequency? - Answers - 229 Hz
