Buoyancy: A cylindrical rod of length 12 cm and diameter 2.0 cm will just barely float in water of density 1000 kg/m3. What is its mass?
A. 38 g
B. 75 g
C. 150 g
D. 300 g
Answer: A
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A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path
In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm. What was the potential difference V? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C) What will be an ideal response?
A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
The CNO cycle produces energy by fusing
A. silicon into iron. B. hydrogen into helium. C. neon into magnesium and oxygen. D. carbon and nitrogen into oxygen.
The primary purpose of a lightning rod is to
A) attract lightning and guide it to the ground. B) discharge the structure to which it is attached. C) cancel the electric field within the structure to which it is attached. D) induce a charge opposite to that of charged clouds overhead.