If a 500-W heater carries a current of 2.00 A, what is the voltage across the ends of the heating element?
a. 2000 V
c. 0.008 V
b. 125 V
d. 250 V
D
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The apparent positions of stars around the sun during an eclipse have been used to prove the general theory of relativity
a. True b. False Indicate whether the statement is true or false
When multiplying several quantities, the number of significant digits in the result must always be
A) larger than the number of significant digits in the most accurate of the quantities. B) equal to the number of significant digits in the most accurate of the quantities. C) equal to the average number of significant digits in the most and least accurate of the quantities. D) equal to the number of significant digits in the least accurate of the quantities. E) smaller than the number of significant digits in the least accurate of the quantities.
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another. b. straight lines in space that are parallel to the wire. c. straight lines in space that are perpendicular to the wire. d. circles that have their centers on the wire and lie in planes perpendicular to the wire. e. circles that have the wire lying along a diameter of the circle.
A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass just before it strikes the ground?
a. 0.18 kJ b. 0.97 kJ c. 0.89 kJ d. 0.26 kJ e. 0.40 kJ