A large block of wood and a smaller block of iron on weighing scales both register 1 ton. Taking buoyancy of air into account, which has the greater mass?
A) wood
B) iron
C) both have the same mass.
D) need more information
Answer: A
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Sometimes the outermost layers of a pulsating variable star are too opaque to allow much energy to escape to space. What happens to the star as a consequence of this?
A) Pressure builds up, causing the outer layers to expand until they are transparent enough for the energy to escape. B) The star builds up so much energy that it explodes as a supernova. C) The entire star heats up dramatically, causing the rate of fusion to increase in the core. D) The star becomes a red giant.
Assume a proton in a 1-dim box of width 3.0 fm is in its 1 st excited state
(a) What is its "kinetic" energy (in eV)? (b) How close (fm) to the wall of the "box" is the probability density a maximum?
You can see your image in a mirror because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.
The water hole is important to SETI because it is a(n) ________ part of the radio spectrum
Fill in the blank(s) with correct word