A single force is acting on an object. Which type of motion is not physically allowed?
A. the object speeds up
B. the object is at rest
C. the object slows down
D. the object's motion changes direction
B. the object is at rest
(F = ma, if F is non-zero, there must be acceleration, which implies the velocity changes)
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Indicate whether the statement is true or false
During each cycle, a thermodynamic engine takes in 4.0 J of energy, does 1.0 J of work, and expels 3.0 J of energy. What is its efficiency?
What will be an ideal response?
In an elastic solid there is a direct proportionality between strain and
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