In terms of thermal expansion it is important that
A) a key and its lock are made of similar or the same material.
B) the fillings in your teeth expand at the same rate as teeth.
C) iron rods and concrete in which they're embedded expand equally.
D) all of the above
E) none of the above
Answer: B
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A box is sliding down an incline tilted at a 12.0° angle above horizontal. The box is initially sliding down the incline at a speed of 1.50 m/s. The coefficient of kinetic friction between the box and the incline is 0.340
How far does the box slide down the incline before coming to rest? A) 0.920 m B) 2.33 m C) 1.78 m D) 0.720 m E) The box does not stop. It accelerates down the plane.
Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?
a. Science requires that experimental and theoretical findings be reproducible. b. All scientists are bound by a code of ethics preventing them from publishing fraudulent work. c. Scientific results are reviewed by other scientists before they are published. d. Scientific journals only allow certain highly trusted individuals to publish their work. e. a and c above
Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following?
a. proton c. nucleus b. neutron d. positron
An RBE
A) is an effective dose of 1 Gy. B) is equivalent to 3.70 × 1010 decays/s in radium. C) is 10-2 J/kg. D) when multiplied into dosage, yields the effective dose. E) is an SI unit of absorbed dose = 1 J/kg = 100 rad.