The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) either of these
D) neither of these
Answer: B
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Relative Velocity: A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the shore) in order to travel directly across the stream.(a) What is the speed of the current?(b) What is the resultant speed of the boat with respect to the shore?
What will be an ideal response?
A river flows toward the East at 1.7 m/s. Steve can swim 2.0 m/s in still water. If he swims, relative to the water at a direction of 33 degrees west of north, how long will it take him to cross the 75 m wide river?
A. 45 s B. 39 s C. 123 s D. 27 s
Which of the following statements is TRUE?
A. Saturn has small- and medium-sized moons, but no large ones. B. Jupiter's solid surface lies just below the cloud layers visible from Earth. C. Neither Uranus or Neptune have ring systems. D. The Great Red Spot is an anti-cyclone on Jupiter E. There is no evidence to suggest that either Jupiter or Saturn has a rocky core.
As ice floats in water, about 10% of the ice floats above the surface of the water. If we float some ice in a glass of water, what will happen to the water level as the ice melts?
a. The water level will rise 10% of the volume of the ice that melts. b. The water level will rise, but not as much as the 10% indicated in answer a. c. The water level will remain unchanged. d. The water level will become lower.