Both He3 and He4 are important in the proton-proton cycle. How are they different, and which comes first?
What will be an ideal response?
Helium 3 has two protons and one neutron, and two of them collide in the last step of the proton-cycle to make helium 4 with two protons and two neutrons; they also release two extra protons.
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The highest-temperature aircraft gas-turbine blades are made from
(a) Tungsten (b) Single crystals of nickel-based alloys (c) Polycrystals of nickel-based alloys (d) Alumina
A uniform cylinder of radius R, mass M, and length L rotates freely about a horizontal axis parallel and tangent to the cylinder, as shown below. The rotational inertia of the cylinder about this axis is
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A.
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.In a circuit powered by a battery it is correct to say that electrons flow
A) from the battery and into the circuit. B) from the negative terminal to the positive terminal of the battery. C) through both the battery and the devices making up the circuit. D) none of the above
The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ? m2 to 5.0 × 10-5 T ? m2 in 0.10 s. What emf is induced in this coil?
A) 5.0 × 10-4 V B) 4.0 × 10-4 V C) 1.0 × 10-4 V D) None of the given answers are correct.