An elevator accelerates upward with an acceleration equal to the acceleration of gravity
A ray of light emitted from one wall inside the elevation at a height h relative to the floor of the elevator will hit the opposite wall at a height (relative to the floor) A)
greater than h.
B)
less than h.
C)
equal to h.
B
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Suppose object C is in thermal equilibrium with object A and with object B. The zeroth law of thermodynamics states:
A. that C will always be in thermal equilibrium with both A and B B. that C must transfer energy to both A and B C. that A is in thermal equilibrium with B D. that A cannot be in thermal equilibrium with B E. nothing about the relationship between A and B
A child drops a toy at rest from a point 4.0 m above the ground at the same instant her friend throws a ball upward at 6 m/s from a point 1.0 m above the ground. At what distance above the ground do the ball and the toy cross paths?
What will be an ideal response?
When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
A. r. B. r2. C. r3. D. r4. E. r6.
What is the main potential concern regarding the creation of artificial life?
A) that they would rapidly evolve and replace existing life on Earth B) that they would be used by hostile nations to build clone armies C) that they might be the source of new diseases or toxins for which terrestrial life would have little resistance D) that they would travel on our robotic space probes and contaminate other planets