A roadway is designed for traffic moving at a speed of 66 m/s. A curved section of the roadway is a circular arc of 290 m radius. The roadway is banked—so that a vehicle can go around the curve—with the lateral friction forces equal to zero
The angle at which the roadway is banked is closest to: A) 57°
B) 59°
C) 55°
D) 53°
E) 51°
A
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Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because ________
A) of increased magnetic interference B) it is too dangerous to send the Space Shuttle to service satellites during solar maximum C) they are more likely to have their electronics "fried" by a solar flare during solar maximum D) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits
If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial Erms of the beam?
a. 
b. 
c. 
d. 
e. 
A city uses 6.8 × 10^9 gallons of water every day. How many gallons per minute must be pumped from the reservoir to meet the city's water needs?
a. 4.7E+6 b. 7.9E+4 c. 2.8E+8 d. 6.8E+9
Planets with orbital semimajor axes less than 0.1 AU are called ________
Fill in the blank(s) with correct word