The work you do when pushing a shopping cart twice as far while applying the same force is
A) half as much.
B) twice as much.
C) four times as much.
D) the same amount.
Answer: B
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What is the average kinetic energy of a nitrogen molecule in the air in a room in which the air temperature is 17°C?
A) 6.01 × 10-21 J B) 4.00 × 10-21 J C) 5.00 × 10-21 J D) 7.00 × 10-21 J E) 9.00 × 10-21 J
A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass just before it strikes the ground?
a. 0.18 kJ b. 0.97 kJ c. 0.89 kJ d. 0.26 kJ e. 0.40 kJ
A circuit breaker is wired:
1.in series with the device it is protecting. 2.in parallel. 3.neither in series or in parallel. 4.It is impossible to tell.
In the wave model, light is ________.
A. a mix of electric and magnetic energy B. a packet of energy moving through space C. a compression wave moving through the air D. a ripple in space-time E. the absence of dark