A satellite of mass 500 kg orbits the Earth with a period of 6000 s. The Earth has a mass of 5.98 × 1024 kg. (a) Calculate the magnitude of the Earth's gravitational force on the satellite
(b) Determine the altitude of the satellite above the Earth's surface.
(a) 3900 N
(b) 7 × 105 m
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A farsighted girl has a near point at 2.0 m but has forgotten her glasses at home. The girl borrows eyeglasses that have a power of +2.75 diopters
With these eyeglasses, what is the near point of the girl, assuming that she wears them extremely close to her eyes? A) 28 cm B) 31 cm C) 33 cm D) 37 cm E) 40 cm
A 1 000-kg sports car accelerates from zero to 25 m/s in 7.0 s. What is the average power delivered by the automobile engine?
a. 8.9E+4 W b. 1.8E+3 W c. 4.5E+4 W d. 1.8E+5 W e. 5.4E+4 W
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 Ns. b. 6.1 × 10^4 Ns. c. 8.0 × 10^4 Ns. d. 5.0 × 10^5 Ns. e. 6.0 × 10^5 Ns.
Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have
a. the smaller period. b. the greater period. c. the smaller gravitational mass. d. the larger gravitational mass. e. the larger universal gravitational constant.