What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?
a. Hubble's law
b. supernova observations
c. period-luminosity relationship of variable stars
d. parallax
a
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Magnetic Field of a Long Wire: At point P the magnetic field due to a long straight wire carrying a current of 2.0 A is 1.2 µT. How far is P from the wire? (?0 = 4? × 10-7 T ? m/A)
A. 11 cm B. 22 cm C. 33 cm D. 44 cm E. 55 cm
A 
cm rectangular piece of copper is at a temperature of 10.0
The coefficient of linear expansion of copper is 
If the temperature of the copper rectangle increases its temperature by 2.00
then what is the change in the area of the rectangular piece of copper?
A. 
B. 
C. 
D. 
E. 
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
A player hits a tennis ball into the air with an initial velocity of 32 m/s at 35° from the vertical. How fast is the ball moving at the highest point in its trajectory if effects of air are negligible?
What will be an ideal response?