A thermodynamic engine has an efficiency of 35.0% and receives 150 J of energy per cycle
(a) How much work does it do in each cycle?
(b) How much thermal energy does it "waste" in each cycle?
(a) 52.5 J (b) 97.5 J
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A coin is 12 cm in front of a converging lens with focal length of magnitude 4.0 cm. Where is the image?
A) 6.0 cm in front of the lens B) 6.0 cm behind the lens C) 8.0 cm behind the lens D) 4.0 cm in front of the lens
Newton's Second Law in 1 Dimension: The figure shows an acceleration-versus-force graph for a 125-g object. What should be the value of the first tick-mark on the vertical scale, as indicated by the arrow in the figure?
A. 4 B. 8 C. 0.00400 D. 0.00800
A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 435,000 N, how much further does it travel along the runway before it comes to a stop?
A) 40.5 m B) 142 m C) 181 m D) 251 m E) 456 m
When the momentum of a punch is stopped by the fighter's jaw, he "rides with the punch" so as to
1) decrease the velocity of the blow, 2) increase the time of contact of the blow, and thereby reduce the 3) force. 4) impulse. 5) momentum. 6) energy.