An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?
A) -225 kJ
B) -1075 kJ
C) 1075 kJ
D) 225 kJ
E) 276 kJ
B
You might also like to view...
Suppose Earth were to cool down a little. How would the carbon dioxide cycle tend to restore temperatures to normal?
A) Cooler temperatures lead to slower formation of carbonate minerals in the ocean, so carbon dioxide released by volcanism builds up in the atmosphere and strengthens the greenhouse effect. B) Cooler temperatures cause volcanoes to become more active, so they release more carbon dioxide into the atmosphere than they do when temperatures are warmer. C) Cooler temperatures allow carbon dioxide to form rain and rain out of the atmosphere. D) Cooler temperatures mean more ice and more erosion, which somehow makes the planet warm up.
The astrometric technique looks for planets with careful measurements of a star's
A) brightness. B) velocity towards or away from us. C) position in the sky. D) all of the above
A fancy sports car passes Big Ben at a speed of 0.600c. What time interval will the driver measure for a one-second interval on the large clock?
A. 1.67 s B. 0.800 s C. 1.25 s D. 0.600 s E. 1.00 s
A parallel-plate capacitor is filled with a dielectric with K = 4. The plate area is 3 m2 and the plate separation is 2 mm. The capacitance of this capacitor is
A) 8 nF. B) 210 nF. C) 18 nF. D) 53 nF. E) 13 nF.