A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail
What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg ? K.
A) 3.6 K B) 1.8 K C) 7.7 K D) 8.1 K E) 2.7 K
D
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John is nearsighted and cannot see things beyond 110 cm from his eyes. What is the focal length of the contact lenses that will enable him to see distant objects clearly?
A) +50 cm B) -50 cm C) -110 cm D) +110 cm E) -30 cm
Mercury's Caloris Basin is aptly named, since:
A) it is the region on Mercury looking much like our own "painted desert." B) it is the only such large basin on Mercury. C) it is the hottest region, turning to face the Sun when Mercury is at perihelion. D) it is always pointed directly at the Sun. E) it is the largest impact basin found in the solar system.
Describe the possible history of a typical Plutino as astronomers now believe it occurred
What will be an ideal response?
If you took a Ferris wheel ride in space while sitting on a bathroom scale, your weight
A. would increase and decrease just as on Earth. B. would be constant and larger than zero for the entire ride. C. would start large and continually decrease. D. would start small and continually increase. E. would be zero for the entire ride.