An object is placed 15 cm to the left of a convex lens of focal length 20 cm. Where is the image of this object located?
A) 60 cm to the right of the lens
B) 60 cm to the left of the lens
C) 8.6 cm to the right of the lens
D) 8.6 cm to the left of the lens
E) 30 cm to the left of the lens
B
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Calorimetry: A jogger is running outdoors on a cold day when the temperature is -20.0°C. She is breathing at the rate of 25 breaths per minute, and each time she breathes in she inhales 0.00450 m3 of air. How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her lungs is heated to her body temperature of 37.0°C before it is exhaled? The specific heat of air is 1020 J/kg ? K and the density of air under typical conditions is 1.29 kg/m3.
A. 169 kJ B. 278 kJ C. 354 kJ D. 431 kJ E. 543 kJ
Which of the following frequencies could NOT be present as a standing wave in a 2m long organ pipe open at both ends? The fundamental frequency is 85 Hz
a. 85 Hz. b. 170 Hz. c. 255 Hz. d. 340 Hz. e. 382 Hz.
Refer to the H-R diagram above that shows the life track of a 1-solar-mass star, with various stages labeled with Roman numerals. After all its life stages are completed, the remaining core of this star will be left behind as
A) a white dwarf made primarily of carbon and oxygen. B) a white dwarf made primarily of hydrogen. C) a neutron star. D) a black hole. E) a supernova.
How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material. B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material. C) Asteroids are made of icy material and are denser than the comets, which are more rocky. D) Asteroids are made of icy material and are less dense than the comets, which are rockier. E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.