The Galileo mission put a spacecraft into orbit around Jupiter. Which statement is true?
A) Intense magnetic fields were discovered in the asteroid belt.
B) A saltwater ocean was discovered on Jupiter.
C) The spacecraft crashed into the moon Europa.
D) The spacecraft used a gravity assist from both Venus and Earth.
E) A probe was released which soft landed on Io.
D
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Under what condition is average velocity equal to the average of the object's initial and final velocity?
A) This can only occur if there is no acceleration. B) The acceleration must be constant. C) The acceleration must be constantly increasing. D) The acceleration must be constantly decreasing. E) This can occur only when they are zero.
If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)
a. 2.20 m/s2 b. 3.73 m/s2 c. 4.20 m/s2 d. 5.50 m/s2
Electrical forces between charges are strongest when the charges are
a. far apart b. close together c. the electrical force is constant everywhere
A region in the Universe where there are almost no galaxies is called a ________.
A. void B. supermassive black hole C. dark nebula D. zone of avoidance