Like the RR Lyrae stars, Cepheids are all similar in luminosity, hence their use in measuring stellar distances
Indicate whether the statement is true or false
FALSE
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Identical particles are placed at the 50-cm and 80-cm marks on a meter stick of negligible mass. This rigid body is then mounted so as to rotate freely about a pivot at the 0-cm mark on the meter stick. If this body is released from rest in a horizontal position, what is the angular speed of the meter stick as it swings through its lowest position?
A. 4.2 rad/s B. 5.4 rad/s C. 4.6 rad/s D. 5.0 rad/s E. 1.7 rad/s
Specific Heat: A 920-g empty iron kettle is put on a stove. How much heat in joules must it absorb to raise its temperature form 15.0°C to 93.0°C? The specific heat for iron is 113 cal/kg ? C°, and 1 cal = 4.186 J.
A. 33,900 J B. 40,500 J C. 8110 J D. 40,100 J
A laser can be used for very accurate measurements of distances between objects
a. True b. False Indicate whether the statement is true or false
State the first postulate of the special theory of relativity (relativity principle)
What will be an ideal response?