Two concentric imaginary spherical surfaces of radius R and 2R, respectively, surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux ?1 through the surface of radius R, the electric flux ?2 through the surface of radius 2R is
a.
.
b.
.
c
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A wooden raft has a mass of 50 kg. When empty it floats in water (density 1000 kg/m3 ) with 69% of its volume submerged. What mass of sand can be put on the raft without it sinking?
What will be an ideal response?
A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction acted on the stone as it fell?
A) 4.1 N B) 2.9 N C) 0.13 kN D) 7.2 N E) 1.2 N
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (p) rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
a. zero b. 13 mV c. 26 mV d. 20 mV e. 18 mV
The color force between quarks is carried by mesons
a. True b. False Indicate whether the statement is true or false