A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
a. 20
b. 60
c. 40
d. 80
e. 10
c
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A 78.0 kg object is travelling due North at 15.2 m/s, and experiences a constant net force of 1.72 kN toward the South. How long will it take to stop under the influence of this force?
A. 1.45 s B. 2.98 s C. 0.335 s D. 0.689 s
A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the
A) right. B) left. C) front. D) back. E) none of the above
There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which is the more likely scenario?
A) the huge size of the Atlantic Ocean makes this impossible B) although the force on his finger would have been huge, the pressure would have been small enough for this to occur C) the force on his finger would have been less than 1 N D) both force and pressure on his finger would have been great, but not too great for a public-spirited Dutch lad E) none of the above
The symbol indicating the number of nucleons in a nucleus is N
a. True b. False Indicate whether the statement is true or false