If two observatories on opposite sides of the Earth were to measure the position of a star to calculate its parallax, then the diameter of the Earth would be the ________
Fill in the blank(s) with correct word
baseline
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The acceleration of gravity on Earth's surface is 9.8 m/s2. What is the acceleration of gravity at a height of 6,400 km above Earth's surface? (Hint: recall the 1/r2 dependence and note that Earth's radius is 6,400 km.)
A. 19.6 m/s2 B. 2.45 m/s2 C. 9.8 m/s2 D. 4.9 m/s2
If a guitar string has a fundamental frequency of 512 Hz, what is the frequency of its first overtone?
a. 511 Hz b. 256 Hz c. 510 Hz d. 1 020 Hz e. 513 Hz
In a lab experiment, a student brings up the rotational speed of a rotational motion apparatus to 30.0 rpm. She then allows the apparatus to slow down on its own, and counts 240 revolutions before the apparatus comes to a stop
The moment of inertia of the flywheel is 0.0850 kg?m2. What is the retarding torque on the flywheel? A) 0.0425 Nm B) 0.159 Nm C) 0.0787Nm D) 0.000278 Nm E) 0.0000136 Nm
A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16 cm high steps a 70 kg athlete could ascend in one minute while expending one horsepower is
a. 4. b. 7. c. 65. d. 408. e. 4 567.