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PHYSICS FINAL
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Terms in this set (37)
Guitar string 1 has a mass of 1/5th that of Guitar string 2. If both strings are the same length and at the same tension, how do the wave speeds in the two strings compare?
V1 = sqrt 5V2
A light spring with a mass at the end of it hangs from the ceiling. You pull the mass down by 10 cm from its equilibrium length and release the spring. If it takes 12.5 s to complete 25 complete oscillations, the frequency of the oscillations is
2 Hz
You are whistling on a beautiful, 20oC day (the speed of sound in air is 343 m/s) and decide to measure the frequency of the sound in your whistle, which you find to be an F#6 (1490 Hz). The wavelength of that sound is
23 cm
You are standing still on the side of the road and you hear the siren of a firetruck that is driving away from you at a speed of 18 m/s. If the firetruck emits a sound wave at a frequency of 820 Hz and the air temperature is 20oC that day, so the speed of sound is 343 m/s, the frequency you hear is
779 Hz
A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 82.5 kHz, and the speed of sound in air is354 m/s, what is the smallest insect the bat can detect
4.3 mm
test 4
...
you have equal masses of water and an unknown liquid. The water is initially at 85C and the unknown liquid is initially at 15C. You pour both liquids into an empty calorimeter and carefully monitor the temperature of the mixture. You notice that the temperature stops changing when the temperature reaches 65C. What can you infer from this experiment?
The specific heat of the unknown liquid must be less than that of water
Snowshoes allow us to walk on top of snow (without sinking into the snow) because?
Increasing the contact surface area between your foot and the snow reduces the pressure between your foot and the snow
You have some amount of an unknown metal in the shape of a cube. You find that it has a mass of 0.450 kg and the cube has sides of 3.91 cm. The metal is likeliest to be?
Steel (7,500 kg/m^3)
If we have a heat engine, the second law of thermodynamics requires that?
The amount of work a heat engine can do must be less than the amount of heat added to the engine
When you perform strenuous exercise, your heart rate increases and the capillaries near the surface of your skin open up to allow more blood flow to your skin. This increase in movement of blood from your warmer core to your cooler skin is an example of heat transport by?
Convection
While scuba diving, you dive down to s depth of 30 meters below the surface of the water. If the atmospheric pressure at the surface of the water is 1.01 x 10^5 Pa, and the density of saltwater is about 1,030 kg/m^3, which is the closet to the total pressure on your body at 30 m below the surface of the water?
4 x 10^5 Pa
Exactly 1.0 mol of a monatomic gas is at a temperature of -10 C. The total internal energy of the gas closet to?
+3.3 kJ
You purchase a cookbook online and realize all the temperatures are listed in celsius and you only have a thermometer that reads temperatures in Fahrenheit. If a recipe calls for you to heat something to 67 C, this temperature in Fahrenheit is closet to?
154 F
Test 3
...
You are watching figure skating and notice that the figure skater tucks his arms close to his body in the middle of a spinning jump and then extends his arms out away from his body just before landing. The skater does this because?
Extending his arms increases his moment of inertia and, since angular momentum is conserved, his rotational speed will decrease
A centrifuge rotates at a rate of 12,000 revolutions per minute. The angular speed of the centrifuge is closet to?
1,300 rad/s
Two solid spheres, each mass M, are rotating with the same rotational kinetic energy. If cylinder A has half the radius of cylinder B, which one of the following is true of the magnitude of their angular velocities?
wa = 2 wb
Two points, marked A and B are on a spinning disk, where A is on the outer edge of the disk and B is half way from the center to the outer edge of the disk. If the disk is rotating at a constant angular velocity, which of the following statements is/are true?
wa = wb
Vt,A > Vt,B
at,A = at,B
You find that it takes a 240 N perpendicular force applied at a distance of 10 cm from the door's hinge to push open a door. If instead you were to push the door at a distance of 60 cm from the hinge, how much perpendicular force would be required to open the door?
40 N
A baker spins a pizza dough as they toss the pizza up in the air. As the pizza dough rapidly spins in the air, its radius increases. Assume that the pizza can be approximated as a solid disk, that the mass of the pizza dough does not change during the toss, and that you can ignore air resistance, which of the following statements is/are true?
As the radius of the pizza increases, the angular speed of the pizza decreases
A satellite of mass msat orbits the earth at a distance of r from the center of the earth and experiences a gravitational force of magnitude Fg1. If the satellite is moved to an orbit of half the original distance from the center of the earth, the new gravitational force, Fg2, is?
Fg,2 = 4Fg,1
You are driving along the highway at a constant speed while traveling through a semi-circular curve in the road. Assuming the radius of curvature of your path does not change, which of the following statements is/are true?
at = 0
ac x 0
vt x 0
Test 2
...
A child and an adult are walking and not paying attention to where they are going, and they collide with one another. Assuming the adult has a much larger mass than the child and that the collision is not perfectly elastic, which of the following statements must be true?
The child must experience a greater change in velocity than the adult during the collision
The child must experience a change momentum
A spaceship is traveling through space at a constant velocity, which of the following can we conclude must be true about this spaceship?
The net external force acting on the spaceship must be zero
You slide a 3.5 kg book 75 cm across a desk while applying a force of 5 N, and then you slide it back to its initial position while applying a force of 7 N. During this whole process, the work done by the normal force is closet to?
o.o J
Your friend (of mass 55 kg) skateboards past you at a velocity to 0.75 m/s to the east. To speed up, your pushes on the ground with horizontal force of 60 N directed along their direction of motion for 0.25s. Which of the below is closet to your friends final momentum after the push?
56 kg x m/s to the east
Two particles collide with each other. If the collision between the two particles is an inelastic collision. Which of the following statements is true?
The total momentum of the two particles is conserved, but the total kinetic energy of the two particles is not conserved
Two particles collide with each other. If the collision between the two particles is a perfectly elastic collision. Which of the following is true?
Both the total momentum and total kinetic energy of the two particles are conserved
A forklift lifts a 200kg pallet from the ground to a height of 1.5 m above the ground and then drives 20 m horizontally across the room snd deposits the pallet on a shelf 0.5 m above the ground. The total change in gravitational potential energy of the pallet during this whole procedure is closet to?
980 J
spring 1 and spring 2 both have the same spring constant and are both secured to a box of mass, m. If spring 1 is compressed by some distance x1 from its equilibrium length and spring 2 is stretched by a distance of [x2] = 2[x1] from its equilibrium length, how do the potential energies stored in the two springs compare?
PEs,1 = 1/4 PEs,2
Test 1
...
If the acceleration of an object is not zero, then which of the following is true?
The velocity of the object must be changing over time
You toss your keys up and across the room to your roommate. Assuming you can ignore air resistance on the keys, which of the following are true when the keys are at the highest point?
the vertical component of the velocity of the keys is zero
A car is traveling at 25 MPH. The cars speed in meters per second is closet to which?
10 m/s
A baksetball player is initially running at a velocity of 5 m/s in the y-direction. At a time 1.0 s later, the basketball player is running at a velocity of 4 m/s along the x-direction. The x-component of the basketball players average acceleration is?
+4.0 m/s^2
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