The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2. Assume a circular orbit
(a) What is the period of the International Space Station's orbit? (b) What is the speed of the International Space Station in its orbit?
(a) 5.5 ×103 s (b) 7.7 ×103 m/s
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A very large sheet of a conductor carries a uniform charge density of 4.00 pC/mm2 on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor? (?0 = 8.85 × 10-12 C2/N • m2)
A) 4.52 × 105 N/C B) 2.26 × 105 N/C C) 9.04 × 105 N/C D) 0.452 N/C E) 0.226 N/C
When lying down, the gauge pressure of the blood at a patient's heart is 13.3 kPa. If the patient suddenly stands up and her body doesn't compensate quickly enough for the pressure changes, what would be the pressure at her head, 55.0 cm above her heart? The density of blood is 1 060 kg/m3
a. 7.59E+3 Pa b. 5.71E+3 Pa c. 1.90E+4 Pa d. 5.85E+5 Pa
A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on very distant mountains?
A) -4.8 m B) -5.2 m C) 4.2 m D) -4.2 m E) 5.2 m
Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite b) obsidian c) basalt d) pumice