The source of all magnetism is
A) tiny pieces of iron.
B) tiny domains of aligned atoms.
C) ferromagnetic materials.
D) moving electric charge.
E) none of the above
Answer: D
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A uniform pressure of 21 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 2.4 × 10^-2 % c. 8.4 × 10^-2 % b. 1.5 × 10^-3 % d. 0.5 × 10^-3 %
A muon formed high in the Earth's atmosphere travels at a speed 0.870c for a distance of 4.00 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 3.1E–5 s b. 7.6E–6 s c. 1.5E–5 s d. 5.1E–5 s e. 4.3E–5 s
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Indicate whether the statement is true or false
An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 30 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 7.8 × 10^2 N c. 50 N b. 2.0 × 10^2 N d. 1.7 × 10^2 N