How fast must a 6.0-kg cat run to have a kinetic energy of 150 J?
What will be an ideal response?
7.1 m/s
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Magnetic Poles: If you were to cut a small permanent bar magnet in half,
A. one piece would be a magnetic north pole and the other piece would be a south pole. B. neither piece would be magnetic. C. each piece would in itself be a smaller bar magnet with both north and south poles. D. None of these statements is true.
Calorimetry: If 50 g of lead (of specific heat 0.11 kcal/kg ? C°) at 100°C is put into 75 g of water (of specific heat 1.0 kcal/kg ? C°) at 0°C. What is the final temperature of the mixture?
A. 2.0°C B. 6.8°C C. 25°C D. 50°C
If M = 6.0 kg, what is the tension in string 1?
A. 39 N B. 34 N C. 29 N D. 44 N E. 51 N
An iron core cannot support a star because
A) iron is the heaviest element, and sinks upon differentiation. B) iron cannot fuse with other nuclei to produce energy. C) iron is in the form of a gas, not a solid, in the center of a star. D) iron supplies too much pressure. E) iron has poor nuclear binding energy.