A car of mass m goes around a banked curve of radius r with speed v
If the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to A)
mg/2.
B)
mg.
C)
mg sin? .
D)
mv2/r.
E)
tan[v2/(rg)].
D
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An amusement ride consists of a car moving in a vertical circle on the end of a rigid boom. The radius of the circle is 10 m. The combined weight of the car and riders is 5.0 kN. At the top of the circle the car has a speed of 5.0 m/s which is not changing at that instant. What is the force of the boom on the car at the top of the circle?
a. 3.7 kN down b. 1.3 kN down c. 6.3 kN up d. 3.7 kN up e. 5.2 kN down
If the temperature of the Earth warms up how does the carbon dioxide cycle respond?
A) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere B) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production C) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production D) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere
A boat at anchor is rocked by waves whose crests are 40 m apart and with wave speed 10 m/s. These waves reach the boat once every
A) 400 s. B) 30 s. C) 4 s. D) 0.25 s.
The Phanerozoic is a(n)
a. epoch. b. era. c. eon. d. period.