A block of Styrofoam floats on water while a lead block of the same size block lies submerged in the water. The buoyant force is greatest on the
A) lead.
B) Styrofoam.
C) same for both
Answer: A
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Which of the following is most sensitive to low-intensity light?
a. the green cones c. the red cones b. the blue cones d. the rods
The slow ________ of Mercury was first determined using radar signals sent from Earth
Fill in the blank(s) with correct word
The isotope 99m Tc (half-life of 6.0 hours) is used in bone scans. How long does it take a quantity of 99m Tc to reduce to 1% of its initial activity?
A) 0.06 hours B) 3.3 hours C) 33 hours D) 40 hours E) slightly more than one month
A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. The field out of the paper decreases to 0.02 T in 12 milliseconds
(a) What is the magnitude of the change in magnetic flux enclosed by the coil? (b) What is the average voltage induced in the coil as the flux is changing? (c) If the coil has a resistance of 4.0 ohms, what is the magnitude of the current in the coil?