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Communications satellites are used to bounce radio waves from the earth's surface to send messages around the curvature of the earth. In order to be available all the time, they must remain above the same point on the earth's surface and must move in a circle above the equator. How long must it take for a communications satellite to make one complete orbit around the earth? (Such an orbit is said to be geosynchronous.) Apply Newton's second law to the satellite and find its altitude above the earth's surface.
A 600g mass is traveling west (positive x-axis) at 8.0 m/s undergoes an inelastic collision with a stationary 250g mass. If the 600g mass travels at an angle of 40 (o) above the x-axis and with a speed of 3 m/s
A passenger with mass 85 kg rides in a Ferris wheel. The seats travel in a circle of radius 35 m . The Ferris wheel rotates at constant speed and makes one complete revolution every 25 s
Would a plucked guitar sting vibrate for a longer time or a shorter time if the instrument had no sounding board? explain.
Photorefractive keratectomy (PRK) is a laser-based surgery process that corrects near- and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. What is the energy of a single photon
A higway curve with a radius of 400m is banked properly for a car traveling 120km/h. how much sideways force must the tires exert
The radius of a black hole is the distance from the black hole's center at which the escape speed is the speed of light. What is the radius of a black hole with a mass five times that of the Sun
You and a close friend stand facing each other. You are as close as you can get without actually touching. If a wire is attached to each of you, estimate the capacitance of this "human capacitor
An aircraft weighing 812 N is accelerated at 11.8 m/s2 for 5 seconds, at which time the aircraft launches. Assume the acceleration is constant
At time t = 0 and at position x = 0 m along a string, a rightward (+x dir) travelling sinusoidal wave with frequency of 220 Hz has displacement y = +4.0 mm, What is the smallest positive phase angle for this wave
A parallel-plate capacitor has plates of area 114.0 cm2 and a separation of 1.45 cm. A battery charges the plates to a potential difference of 177.0 V, What is the capacitance with the slab in place
A helium gas cylinder has a pressure of 28 atm. What fraction of the original amount of helium remains in the cylinder
An air-filled parallel-plate capacitor has plates of area 2.10 cm2 separated by 0.50 mm. The capacitor is connected to a 3.0 V battery. What is the charge on the capacitor
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