A cubical box 25.0 cm on each side is immersed in a fluid. The pressure at the top surface of the box is 109.40 kPa and the pressure on the bottom surface is 112.00 kPa. What is the density of the fluid?
A) 1000 kg/m3
B) 1030 kg/m3
C) 1060 kg/m3
D) 1090 kg/m3
E) 1120 kg/m3
C
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A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 20° and increasing at the rate of 10°/s, what is the magnitude of the induced emf in the loop?
A. 13 mV B. 0.27 V C. 4.8 mV D. 14 mV E. 2.2 mV
Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A. Star A is hotter and smaller than Star B. B. Star A is cooler and bigger than Star B. C. Star A is hotter and bigger than Star B. D. Star A is cooler and smaller than Star B.
A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 30.0 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 0.0
Why is the sky blue (on Earth)?
A) because the Sun emits mostly blue light B) because molecules scatter red light more effectively than blue light C) because deep space is blue in color D) because molecules scatter blue light more effectively than red light E) No one knows—this is one of the great mysteries of science.