Although protons repel each other at a distance, they will actually bind if they come close enough together
Indicate whether the statement is true or false
TRUE
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Which internal energy source is the most important in continuing to heat the terrestrial planets today?
A) accretion B) differentiation C) radioactivity D) tidal heating
A future astronaut exploring Mars would
A) need to stay inside a spacecraft at all times B) be able to walk on the surface at any time wearing only warm clothing C) need to wear a spacesuit at all times D) need to wear a spacesuit only during the winter
An object of radius R and moment of inertia I rolls down an incline of height H after starting from rest. Its total kinetic energy at the bottom of the incline:
a. is gR/I. b. is I/gH. c. is 0.5Ig/H. d. cannot be found from the given information alone.
A pion is an unstable particle that has an average lifetime of 2.55 × 10-8 s
This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the pion. An "average" pion is traveling at 0.230c relative to Earth. How far does it travel in its lifetime, relative to Earth? A) 2.07 m B) 1.81 m C) 2.23 m D) 3.22 m E) 3.50 m