In an isobaric process 4.0 × 10^4 J of work is done on a quantity of gas while its volume changes from 2.5 m3 to 1.5 m3 . What is the pressure during this process?
a. 3.4E+4 Pa
b. 2.8E+4 Pa
c. 4.0E+4 Pa
d. 4.6E+4 Pa
c
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According to our theory of solar system formation, why does the Sun rotate slowly today?
A) The Sun once rotated much faster, but it transferred angular momentum to charged particles caught in its magnetic field and then blew the particles away with its strong solar wind. B) The Sun once rotated much faster, but it transferred angular momentum to the planets during the parts of their orbits where they come closest to the Sun. C) The Sun once rotated much faster, but it lost angular momentum due to internal friction. D) The Sun once rotated much faster, but it lost angular momentum because everything slows down with time. E) The Sun was born rotating slowly because the solar nebula had very little angular momentum.
Stars that have masses similar to the Sun's, and sizes similar to the Earth are:
A) main sequence stars. B) white dwarfs. C) red giants. D) red dwarfs. E) brown dwarfs.
Does red light have higher or lower energy than blue light?
What will be an ideal response?
A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective. How far apart are the lenses?
A) 20 mm B) 21 mm C) 23 mm D) 33 mm E) 41 mm