A freely-falling object has a speed of 30 m/s at one instant. Exactly 2 seconds later its speed will be
A) the same.
B) 40 m/s.
C) 50 m/s.
D) more than 50 m/s.
Answer: C
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Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
a. decreases by 1/4 b. decreases by 1/2 c. stays the same d. increases by 2 times e. increases by 4 times
Electromagnetic waves with wavelengths shorter than gamma rays are called infrared radiation
Indicate whether the statement is true or false
The internal activity of Mercury is responsible for its ________.
A. slow rotation B. lack of an atmosphere C. high surface temperature D. magnetic field
According to our present theory of solar system formation, how did Earth end up with enough water to make oceans?
A) The water was mixed in the other materials in the planetesimals that accreted at our distance from the Sun. B) The water was formed by chemical reactions among the minerals in the Earth's core. C) The water was brought to the forming Earth by planetesimals that accreted beyond the orbit of Mars. D) Earth formed in the relatively narrow region of the solar nebular in which liquid water was plentiful.