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
C
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An object may be electrically neutral, but regions may be charged by ______________
Fill in the blank(s) with correct word
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
Mars has a mass that is 1/10th the mass of the Earth and a radius that is 1/2 the radiusof Earth. Compare the force of gravity on Mar's surface to that on the surface of Earthusing the proportional relationship F is proportional toM/R2
a) Gravity on Mars is 10 times stronger than on Earth. b) Gravity on Mars is 1/10th as strong as on Earth. c) Gravity on Mars is 4/10ths as strong as on Earth. d) Gravity on Mars is 4 times stronger than on Earth. e) Gravity on Mars is equal to gravity on Earth.
Which property is common to spiral galaxies?
A) very little internal structure B) open clusters in the halo C) globular clusters in the nucleus D) ongoing star formation and emission nebula in the arms E) ongoing star formation and emission nebula in the halo