The Instability Strip on the H-R Diagram is the location for what type of stars _______________
Fill in the blank(s) with correct word
Cepheid variables
RR Lyrae variables
pulsating stars
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A rad is
A) a dosage of 2.58 × 10-4 C/kg. B) 10-2 J/kg. C) the SI unit of radioactivity ( = 1 decay/s). D) the SI unit of absorbed dose = 1 J/kg = 100 rad. E) 3.70 × 1010 decays/s in radium.
An elevator suspended by a vertical cable is moving downward but slowing down. The force that the cable exerts on the elevator must be
A) greater than the force that Earth exerts on the elevator. B) less than the force that Earth exerts on the elevator. C) equal to the force that Earth exerts on the elevator.
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
a. 1 c. 3 b. 2 d. 4
A magnetic field will deflect a(n)
a. alpha particle b. beta particle c. gamma ray d. x ray e. all of the above