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.
B
You might also like to view...
Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place. B) Astronomers have detected small lakes of liquid water on Europa's surface. C) Europa has a magnetic field that appears to respond to Jupiter's magnetic field. D) Europa's surface shows very few impact craters.
The universe we live in now is said to be ________ dominated
A) hydrogen B) matter C) dark matter D) dark energy E) radiation
Consider two containers with the same volume and temperature. Container One holds "dry" air--a mixture of nitrogen and oxygen. Container Two holds "moist" air. The "moist" air has the same ratio of nitrogen to oxygen molecules, but also contains water vapor. According to the ideal gas law, if the pressures are equal, the weight of the gas in Container One will be
a. lighter than the gas inside the second container. b. equal to the weight of the gas in the second container. c. heavier than the gas inside the second container. d. all the above are incorrect because the pressures cannot be equal.
Sarah traveled by automobile from Ft
Lauderdale to Naples, Florida, a distance of 120 miles, at an average speed of 60 mi/h. The time required was a) 5000 hours. b) 2.0 hours. c) 0.50 hours. d) 2.5 hours.