A box sits on a countertop, stationary. A boy pushes horizontally to the right on the box, and a girl pushes on it to the left, yet it remains stationary. Which of the following statements is false?
A. We know the force of the boy on the box is equal in magnitude to that of the girl on the box because
the box is in equilibrium.
B. We know the force of the boy on the box is equal in magnitude to that of the box on the boy because
of Newton’s third law.
C. We know the weight and normal force are equal in magnitude because the box is in equilibrium.
D. We know the weight and normal force are equal in magnitude because of Newton’s third law.
D. We know the weight and normal force are equal in magnitude because of Newton’s third law.
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Indicate whether the statement is true or false
Of the thousands of different isotopes known to exist,
a. most of them are radioactive b. only a couple can be used to build an atom bomb c. some are used in medical diagnosis and treatment d. most occur naturally e. all of the above
The present standard for time is based on
a. the transition of an electron between two energy levels of the cesium-133 atom. b. Earth's rotation. c. Earth's orbit. d. none of these.
Swidden agriculture typically gives yields that are much higher than those in developed countries
What will be an ideal response?