Similar to our Sun, pulsars' rotations are believed to slow down because
a. they are losing angular momentum into space via outward streaming particles.
b. they are dragging companion stars around in their magnetic field.
c. they are getting tired.
d. of conservation of angular momentum.
e. their mass is increasing.
a
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What is an advantage of using chlorine gas to disinfect drinking water supplies?
A) It provides residual protection against pathogens. B) It gives the water a fresh taste. C) Residual chlorine in water helps to whiten teeth. D) Excess chlorine is absorbed in our bodies as a mineral supplement.
Two capacitors with CA greater than CB are connected in parallel with a battery. Which of the following is true?
a. There is more potential difference across CA. b. There is more potential difference across CB. c. There is the same charge stored on each capacitor. d. There is the same potential difference across both capacitors.
If 50 g of material at 100°C is mixed with 100 g of water at 0°C, the final temperature is 40°C. What is the specific heat of the material?
A) 0.33 kcal/kg ? °C B) 0.75 kcal/kg ? °C C) 1.33 kcal/kg ? °C D) 7.5 kcal/kg ? °C E) 33 kcal/kg ? °C
A lunar month is about 28 days. If the Moon were farther from Earth than it is now, the lunar month would be
A) more than 28 days. B) less than 28 days. C) about 28 days.