Two identical objects are released from rest from heights R and 2R above the surface of the Earth. After traveling a distance R/2, which object has the larger speed?
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When a nucleus undergoes beta-minus decay, it changes into
A) another isotope of itself. B) a higher mass number. C) a higher atomic number. D) a higher neutron number. E) a lower proton number.
Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars. B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth. C) redshift in the light from the earliest galaxies in the universe. D) force of gravity acting on laboratory objects. E) redshift in the light from the explosions of distant supernovas.
When you suck through a straw, the force that makes the liquid go up the straw is
a. a suction force. b. due to surface tension. c. due to the pressure of the atmosphere. d. antigravity.
According to the equation E = mc2, an object turns into energy when it reaches the speed of light
A) True B) False