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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

A magnetic field will deflect a(n)

a. alpha particle b. beta particle c. gamma ray d. x ray e. all of the above

Physics & Space Science