As measured from the Earth, a spacecraft is moving at speed 0.80c when it releases a probe at speed 0.60c relative to the spacecraft in a forward direction. What would be the speed of the probe as measured from the Earth?
a. 0.70c b. 0.81c
c. c d. 0.95c
d
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Uranus and Neptune do not contain liquid metallic hydrogen because they
a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the sun. e. have magnetic fields that are much too weak.
When we say an appliance "uses up" electricity, we are actually saying that
A) current disappears. B) electric charges are dissipated. C) the main power supply voltage is lowered. D) electrons are taken out of the circuit and put somewhere else. E) electrical energy changes to thermal energy.
A sample containing 4.0 × 1018 atoms of a radioactive isotope decays with a half-life of 2.3 years. How many undecayed atoms are left after 3.7 years?
A) 2.5 × 1018 B) 1.7 × 1018 C) 1.3 × 1018 D) 1.1 × 1018
The ________ theory is thought to explain the formation of our solar system
Fill in the blank(s) with correct word