How are the polar regions of Mercury and the Moon similar?
A) Both are covered by huge mare-type basins from impacts.
B) Both seem to have ice pockets in the deepest, darkest crater floors.
C) Both have bright dry ice polar caps, like Mars.
D) Both have lakes of liquid water under their regolith.
E) Both have been hit by large comets that melted there.
B
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A star with the mass of our Sun will go through several stages of energy generation through fusion. Which sequence accurately describes these stages in the correct order?
a. hydrogen core ? hydrogen shell ? helium shell ? helium core b. hydrogen core ? helium core ? hydrogen shell ? helium shell c. hydrogen core ? hydrogen shell ? helium core ? helium shell ? carbon core d. hydrogen core ? hydrogen shell ? helium core ? helium shell e. hydrogen shell ? hydrogen core ? helium shell ? helium core
A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T,
what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? ((e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg) A) 5.9 × 103 V/m B) 6.0 × 105 V/m C) 7.2 × 106 V/m D) 1.9 × 105 V/m E) 1.1 × 105 V/m
A 6-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g•°C. The heat of fusion of lead is 24.5 J/g
a. 227°C c. 293°C b. 260°C d. 327°C
Briefly explain how mass transferred from one star to another in a binary system flows into a rapidly rotating whirlpool called an accretion disk
What will be an ideal response?