True or False
True or False: Compared to other fundamental forces, gravity is weak.
True
A wave of 15,000Hz is in which range?
a. Infrasonic
b. Sonic
c. Supersonic
d. Ultrasonic
b. Sonic
According to Fermat’s principle, light will always:
a. Travel the path that is the shortest in distance
b. Travel the path that causes the most refraction
c. Travel the path that is the shortest in time
d. Travel the path less traveled
c. Travel the path that is the shortest in time
Draw a (1) concave mirror, (2) convex mirror, (3) double convex lens (4) double concave lens
)
(
()
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True or False: A planet orbiting the sun will travel faster when it is closer to the sun
True
A spring with a higher spring constant will be _ than a spring with a lower constant.
a. Longer
b. Shorter
c. More flexible
d. Stiffer
Which of the following factors would result in more diffraction of a wave passing through an opening?
a. A higher wave frequency
b. A lower wave frequency
c. A larger opening
d. A smaller opening
d. A smaller opening
di is positive, and M and Hi are negative. Classify the image. (real/ virtual & upright/ inverted)
Real & Inverted
True or False: When riding a carousel, your angular velocity increases further out from the center you are.
False
A surfer in the trough of a wave takes 2.8 seconds to reach the highest point of the wave. The velocity of the wave is 6 m/s. What is its wavelength?
V=λf
λ=33.6
(Test 5, #7)
A blue laser beam is incident on a mirror at an angle of 34.5° from the surface of the mirror. What will the angle of reflection be?
90 - 34.5 = 55.5 degrees
A 1.5 cm tall object located 3cm away from a certain mirror has a di of -6cm.
a. What is the magnification of the image?
b. What is the height of the image?
magnification = (--6/3) = 2
height = 2 * 1.5 = 3 cm
True or False: Centrifugal force is caused by having a high velocity.
False
A police car, sounding its 710 Hz siren, is driving at 26.8 m/s to try to catch a driver going through Cushing’s campus. If the driver evading the police drives at 32 m/s away from the police, what frequency will they hear the siren at? Assume the speed of sound is 340 m/s.
f = 710 ((340-32)/(340-28.6)) = 698.2 Hz
*observer away from source-- negative
*source toward observer-- negative
If you shine a red light on a green apple, what color will the apple appear? Explain.
Black
The red light is absorbed, and there is no green light to be reflected. If no light is reflected, the object will appear black.
An object is placed 6cm away from a double concave lens with a focal length of 4cm. Calculate the image distance.
(1/-4) = (1/6) + (1/di)
di = -2.4 cm