Which of the following statements is true of fusion reactions in stars?
A) They only occur outside the atomic nuclei.
B) They occur only when nuclei of two atoms get very close to each other.
C) They only occur as endothermic reactions.
D) They only occur when the Coulomb force is zero and there is no Coulomb barrier.
B
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A runner runs on a circular path of radius 10 m. What is the magnitude of the displacement of the jogger if he runs (a) half-way around the track? (b) all the way around the track?
What will be an ideal response?
Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ?s. When the speed of the turntable is gradually increased,
A. only the lighter container slides outward off the turntable; the heavier one stays on. B. only the heavier container slides outward off the turntable; the lighter one stays on. C. both containers slide off the turntable at the same turntable speed. D. the lighter container slides inward. E. the heavier container slides inward.
A sheet of graphite that is one atom layer thick is called _________.
Fill in the blank(s) with the appropriate word(s).
Show that the conservation of mass equation is satisfied by the stream function ? which satisfies
