The Luyten 726-8 binary system is approximately 9 light-years away. If we send a spacecraft to visit this system traveling at 90% of the speed of light, how long will a one- way trip take as measured from the Earth?
A) it's impossible to tell unless we know the spacecraft's method of propulsion
B) more than 10 years
C) 10 years
D) less than 10 years
C
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A 2.00 kg pendulum bob on a string 1.50 m long, is released with a velocity of 2.00 m/s when the support string makes an angle of 30.0 degrees with the vertical. What is the velocity of the bob at the bottom of the swing?
A. 4.32 
B. 4.00
C. 3.75
D. 3.04
E. 2.81
Which of the following stars will live longest?
A) 1 solar-mass star B) 2 solar-mass star C) 3 solar-mass star D) 4 solar-mass star
The ac motor and generator were invented by
A. Edison. B. Tesla. C. Westinghouse. D. Maxwell. E. Hertz.
The triple point of water occurs only at a unique temperature and pressure
Indicate whether the statement is true or false