The greenhouse effect keeps Venus hot because

a. the atmosphere contains free oxygen.
b. the atmosphere is predominantly carbon dioxide.
c. the surface converts infrared into visible radiation.
d. the surface is free of sulfur compounds.
e. the magnetic field traps a large number of particles from the solar wind.


b

Physics & Space Science

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The inside temperature of a house is 65When the temperature outside the house is 35the furnace supplies 100 Joules per hour to keep the inside of the house warm. If the temperature outside the house goes to 50then what is the fuel consumption of the furnace?

A. 38 Joules per hour B. 42 Joules per hour C. 50 Joules per hour D. 56 Joules per hour E. 61 Joules per hour

Physics & Space Science

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

A. 16 N B. 17 N C. 21 N D. 11 N E. 25 N

Physics & Space Science

In which of the following application of technology in the home is radioactivity utilized?

A) a door-bell B) a humidifier C) a smoke detector D) a food sterilizer

Physics & Space Science

If there were no gravity, a ball thrown upward at an angle would follow a straight-line path. Due to gravity, however, at the end of 1 s it is

A) 5 m below the straight line. B) 10 m below the straight line. C) 15 m below the straight line. D) 20 m below the straight line. E) more than 20 m below the straight line.

Physics & Space Science