Radioactive particles moving at 0.80 c are measured to have a half-life of 
What is their half-life when at rest?
A. 
B. 
C. 
D. 
E. 
B.
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Several of the tributary canyons of the Valles Marineris on Mars are thought to be formed:
A. when water coming from the volcanoes started flowing through the planet. B. from impacts with irregularly shaped comets and asteroids. C. from a chemical reaction between iron oxide and water. D. when strong wind currents along the equatorial region started blowing out sand. E. when ground water, escaping from opening cracks, flowed and cut a channel through the surface beneath.
A spaceship, traveling at 0.100c away from a stationary space platform, launches a secondary rocket towards the station, with a speed of 0.560c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A) 0.460c B) 0.487c C) 0.492c D) 0.660c
We can find the masses and diameters of stars that are in eclipsing binary systems
a. True b. False Indicate whether the statement is true or false
Describe the motion of an object that possesses kinetic energy yet undergoes no net displacement.
a) The object must be rolling b) The object must be sliding c) The object must be at rest d) The object must be spinning e) The object must be falling