Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about Jupiter would be
A) less than 8 km/s.
B) greater than 8 km/s.
C) about 8 km/s.
Answer: B
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As we look at larger and larger scales in the universe, we find
A) a larger and larger percentage of the matter is dark. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) smaller and smaller masses. E) an equal amount of visible and dark matter.
A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball. b. There is a greater residual force from the hand on A than there is on B. c. Only gravity acts on B but there is an additional residual force from the hand on A. d. There is an additional downwards force besides gravity on each ball. e. The only force acting on each ball is the gravitational force.
The threshold energy to initiate a certain nuclear reaction is 3.16 MeV and the Q for the reaction is -2.37 MeV. The stationary target is how many times as massive as the incident particle?
What will be an ideal response?
Which of the following molecules does NOT occur in left- and right-handed forms (carbon is the central atom and the groups around this central atom are in parentheses)?
A) (H) (Cl) C (F) (D) B) (CH3 ) (NH2 ) C (COOH) (H) C) (CHO ) (C2H5 ) C (C2H5 ) (H) D) (C4H9 ) (C2H5 ) C (CH3 ) (C3H7)