The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A) Mass is less, weight is the same.
B) Mass is the same, weight is less.
C) Both mass and weight are less.
D) Both mass and weight are the same.
B
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An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. What is the direction of the electric field vector?
A) Horizontal and pointing south B) Vertical and pointing down C) Horizontal and pointing north D) Vertical and pointing up E) Horizontal and pointing east
A steel ball has a mass equal to 5 kilograms. What is the ball's weight?
Diverging light rays from a nearby object (a few focal lengths away from the mirror) strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point. b. a point beyond the mirror's focal point. c. a point nearer than the mirror's focal point. d. none of the above.
A device which transforms electrical energy into mechanical energy is a _________
a. magnet b. transformer c. generator d. motor