An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1000 m, but the speed remained the same, by what factor would its centripetal acceleration change?
A. 0.25
B. 0.50
C. 1.00
D. 2.00
E. 4.00
Answer: B
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An “up” quark has a charge of -2/3 times the electron’s charge. A “strange” quark has a charge of +1/3 times the electron’s charge. What is the net charge of the quark triplet consisting of two up quarks and a strange quark? (This quark triplet is one of a family of three “? particles.”)
A. +(5/3)e B. +e C. +(1/3)e D. zero E. -(1/3)e F. -e T. -(5/3)e
Weather occurs in the troposphere
Indicate whether the statement is true or false
The warming of the lower atmosphere (the greenhouse effect) results from the
A) absorption of long-wave solar radiation. B) reflection of long-wave terrestrial radiation. C) absorption of long-wave terrestrial radiation by atmospheric gases. D) release of atmospheric gases into the ozone layer.
Pitch corresponds to
1) frequency, 2) noise, 3) loudness, whereas amplitude corresponds to 4) frequency. 5) noise. 6) loudness.