A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle ? with the doorjamb. What is the acceleration of the car?
A) g sin ?
B) g cos ?
C) g tan ?
D) g ?
E) ?
C
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Discounting the newly discovered role of dark energy, the universe we live in now is said to be ________ dominated
Fill in the blank(s) with correct word
A 40.0 cm long organ pipe is filled with air at 0
and is open at both ends. The velocity of sound in air at 0
is 331 m/s. Another 40.0 cm long organ pipe is filled with air at 20
and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?
A. 20.5 Hz B. 17.5 Hz C. 15.6 Hz D. 14.9 Hz E. 12.3 Hz
Suppose that the Sun shrank in size but that its mass remained the same. What would happen to the orbit of the Earth?
A) Earth's orbit would be unaffected. B) The size of Earth's orbit would shrink, and it would take less than one year to orbit the Sun. C) Earth's orbit would expand, and it would take more than one year to orbit the Sun. D) Earth would change from a bound orbit to an unbound orbit and fly off into interstellar space.
The coefficients of friction for plastic on wood are ?s = 0.50 and ?k = 0.40. How much horizontal force would you need to apply to a 3.0-lb plastic calculator to start it moving from rest?
A) 1.2 N B) 2.7 N C) 6.7 N D) 0.15 N E) 0.50 N