Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound waves in air is 335 m/s, what is the smallest size insect they can detect?
a. 4.6 mm
b. 3.6 mm
c. 5.6 mm
d. 6.6 mm
e. 7.6 mm
c
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The warmth you feel from the sun at the beach is an example of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above
The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
D
e.
C and D
Which of these things did Galileo NOT do?
a. Make up a thought experiment that indicated that objects would fall at the same rate. b. Invent the concept of acceleration. c. Stop publishing his scientific work after being convicted of heresy. d. Experiment with rolling balls down ramps of increasing steepness to test how objects would fall. e. Argue that Earth moves around the Sun.
Saturn's orbit is more elliptical than Jupiter's, and its tilt is much larger as well
Indicate whether the statement is true or false