A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the Sun to push this solar sail. If a huge sail of area 6.00 × 105 m2 and mass 6000 kg were placed into orbit and turned toward the Sun, what would be the force exerted on the sail? (Assume a solar intensity of 1380 W/m2.)
What will be an ideal response?
5.52 N
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Considering the three general types of geometry (flat, spherical, and saddle-shaped), when do the angles in a triangle add to 180°?
A) only in a flat geometry B) always, regardless of the geometry of space C) only in a spherical geometry D) only in a saddle-shaped geometry E) only if the triangle is an equilateral triangle
The maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00
What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage? A) 0.23 B) 0.25 C) 0.28 D) 0.30 E) 0.32
Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is
A) 9/5. B) 8/5. C) 4/5. D) 4. E) 2.
What is the Asteroid belt?
A. a line of craters on the Moon caused by an asteroidal impact about 50 million years ago B. the place in the Solar System where most of the asteroids are found C. a line of craters on Earth caused by an asteroidal impact about 50 million years ago D. a term used to describe the impact of a very large asteroid with a planet E. None of these choices is correct.