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Unformatted text preview: at 1000 Hz. If the car is
traveling in a straight line at 20.0m/s, what is
the perceived wavelength (to three significant
figures) as measured by someone standing on
the road directly in front of the car? Take the
speed of sound to be 335 m/s.
a. 0.305 m
b. 0.203 m
c. 0.315 m
d. 0.335 m
27. Converging lenses can produce:
a. Only upright images
b. Only inverted images
c. Both upright and inverted images
depending on the distance of the
d. Both upright and inverted images
simultaneously 30. A roller coaster of mass 200 kg starts from a
height of 50.0 m going plunges to a height of
0.0 m, goes then uphill again and comes to rest
on top of the hill at 40.0 m height. The total
distance travelled is 150 m, and some amount
of work was done against fritional forces on
the track. 50
d. 28. An electron is accelerated from rest through a
potential difference of 3.0⋅103V in a particle
accelerator. How fast will it be moving after
this acceleration in m/s?
a. 8.7 × 10
b. 2.4 × 10
c. 2.3 × 10
d. 3.2 × 10
29. 10 kg of the isotope tritium, which has a halflife of 12.3 years, is produced at a reactor.
Which of the following values, in kg, is
closest to the mass of tritium that will remain
after 30 years?
d. 6.6 750 J
19600 J 31. A layer of ethyl alcohol (index of refraction n
= 1.361) lies on top of water (index of
refraction n = 1.333). At what angle relative
to the normal to the interface between the two
liquids, to the nearest degree, is the light from
ethyl alcohol to water totally reflected
d. There is no critical angle
32. A compound microscope is made with an
objective lens with focal length f0 = 0.90 cm
and an eyepiece with focal length fE = 1.1 cm.
The lenses are separated by a distance of 10
cm. If an object is 1.0 cm in front of the
objective lens, where will the final image be
located (to the nearest cm) with respect to the
a. -30 cm
b. -15 cm
c. -23 cm
d. -11 cm Page 5 of 15 ©Prep101...
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- Spring '11