A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip
(a) How long did the trip take according to an observer on Earth?
(b) How long did the trip take according to an observer on the spaceship?
(a) 9.0 light-years (b) 7.8 years
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Resistors in Combination: Three 2.0-? resistors are connected to form the sides of an equilateral triangle ABC as shown in the figure. What is the equivalent resistance between any two points, AB, BC, or AC, of this circuit?
A. 2.0 ? B. 6.0 ? C. 4.3 ? D. 3.3 ? E. 1.3 ?
While more massive than most of its neighbors, the Sun is still technically a low mass star
Indicate whether the statement is true or false
A nuclide whose "generic" symbol is 64 30X would have ______ protons and ______ neutrons.
A. 64, 30 B. 30, 64 C. 30, 34 D. 34, 30
A 75.0-kg swimmer dives horizontally off a 465-kg raft initially at rest. If the diver's speed immediately after leaving the raft is 5.00 m/s, what is the corresponding raft speed?
a. 31.0 m/s b. 375 m/s c. 0.806 m/s d. 1.24 m/s e. 5.00 m/s