About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun, which is 1.5 × 1011 m away
Use this information to estimate the average power output of the sun.
A) 1 × 1026 W
B) 2 × 1026 W
C) 3 × 1026 W
D) 4 × 1026 W
D
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A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table
A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
Suppose that the temperature of the solar nebula had been much colder. How might the Solar System look different today?
A) Terrestrial planets may have formed at a larger distance from the Sun. B) The gas giant planets might be bigger and farther from the Sun. C) The gas giant planets might be bigger and closer to the Sun. D) More planets would have formed.
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
a.
7.0 kN up
b.
7.0 kN down
c.
2.8 kN down
d.
2.8 kN up
e.
5.6 kN down
Opacity is
a. the balance between the pressure and force of gravity inside a star. b. the force that binds protons and neutrons together to form a nucleus. c. the force that binds an electron to the nucleus in an atom. d. a measure of the resistance to the flow of radiation (photons) through a gas. e. the temperature and density at which a gas will undergo thermonuclear fusion.