A spherical interplanetary grain of dust of radius 0.2 mm is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun’s light. Suppose the grain is compressed so that it crystallizes into a sphere with significantly higher density, still at a distance r1. What is the net force exerted on the grain?
1.toward the Sun
2.away from the Sun
3.zero
4.impossible to determine without knowing the mass of the grain
1
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Intensity: 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
Initially, fewer neutrinos were detected than predicted by theoretical models because
A) neutrinos changed form to undetected types of neutrinos. B) the wrong liquid was being used in neutrino detectors. C) particle physicists did not understand the proton-proton chain. D) the proton-proton chain does not actually produce neutrinos. E) neutrinos take many years to pass out of the sun from its core.
Which of the terrestrial worlds has the strongest magnetic field?
A) the Moon B) Mercury C) Earth D) Mars E) Venus
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground
The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?