Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s
b. 16 m/s
c. 24 m/s
d. 30 m/s
e. 4.0 m/s
b
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The Mississippi River delta has widely spaced distributary channels extending long distances into the Gulf of Mexico. This is an example of a(n) ________ delta.
a. estuarine b. bird's-foot c. alluvial d. fluvial e. arcuate
A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 500 gm and has a radius of 4.00 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 1.24 sec. B. 1.42 sec. C. 1.74 sec. D. 1.90 sec. E. 2.25 sec.
Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth
Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip? A) 14.4 years B) 15.0 years C) 10.8 years D) 4.20 years E) 22.7 years
Which of the following polyatomic ions has a doubly negative charge?
a. Acetate b. Sulfate c. Phosphate d. Ammonium