Which of the following type(s) of materials is(are) repelled when a magnet is brought near by?
a. paramagnetic
b. diamagnetic
c. ferromagnetic
d. paramagnetic and ferromagnetic
e. paramagnetic, ferromagnetic, and diamagnetic
b
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Banked Curves: A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the speed with which to take the curve without tending to slide either up or down the surface of the road?
A. 9.4 m/s B. 28 m/s C. 780 m/s D. The curve cannot be taken safely at any speed.
Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2020. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed very close to the speed of light—say, 0.9999c
According to Gwen back on Earth, about how long does it take Jackie to reach Vega? A) about a month B) about 10 years C) about 25 years D) about 100 years
The curved section of a horizontal highway is a circular unbanked arc of radius 740 m
If the coefficient of static friction between this roadway and typical tires is 0.40, what would be the maximum safe driving speed for this horizontal curved section of highway? A) 54 m/s B) 48 m/s C) 52 m/s D) 46 m/s E) 50 m/s
Einstein's famous equation E = mc2 is a statement of __________
Fill in the blank(s) with correct word