Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following?
a. neutron
b. proton
c. nucleus
d. positron
c
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A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force exerted on it by the water?
A) the aluminum B) the lead C) The same buoyant force is exerted on both. D) It cannot be determined without knowing their volumes.
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 10^3 kg/m3.)
a. 5.9 b. 4.5 c. 6.4 d. 3.9 e. 3.1
Standing Waves on a String: A string of linear density 1.5 g/m is under a tension of 20 N. What should be its length if its fundamental resonance frequency is 220 Hz?
A. 0.26 m B. 0.96 m C. 1.1 m D. 1.2 m
A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 × 10^7 m. If the radius of Roton is 5.0 × 10^6 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
a. 31 m/s2 b. 27 m/s2 c. 34 m/s2 d. 40 m/s2 e. 19 m/s2