An alpha particle is
a. a neutral helium atom.
b. any positively charged nucleus.
c. an x-ray.
d. None of the above.
d
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Springs: If 4.0 J of work are performed in stretching an ideal spring with a spring constant (force constant) of 2500 N/m, by what distance is the spring stretched?
A. 3.2 cm B. 3.2 m C. 0.3 cm D. 5.7 m E. 5.7 cm
The escape velocity inside a black hole is
A. half the speed of light. B. infinity. C. greater than the speed of light. D. zero. E. unknown.
A sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates
A) net force. B) the difference between force and mass. C) inertia.
What is a chemical equation?
A) It is a shorthand notation for illustrating a chemical reaction. B) It is the sum of the masses of the products and reactants. C) It is the chemical combination of equal numbers of reactants and products. D) It is a picture of the atoms undergoing a chemical equalization. E) It is any type of reaction that takes place at the equator.