Star 1 is approaching the Earth with speed v. Star 2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star 1
b. Both stars will have the same shift.
c. The value of the speed must be known before an answer can be found. d. star 2
Question 2
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would be the result to be?
a. It would be that of copper since copper is on the outside.
b. It would be that of zinc since zinc is in the center.
c. It would be the sum of the copper and zinc specific heats.
d. It would be between that of copper and that of zinc, depending on coating thickness.
From space earth shows itself as a planet covered mostly by water.
Earth’s Magnetic Field
Star-Nosed Mole
A Rotating, Magnetized Neutron Star
Flexible cooling fan blades change shape as the engine speed changes.
Escape Speed from Earth