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Estimate the linear separation (in kilometres) of two objects at a distance of 7.7 x 106 km that can just be resolved with an observer on Earth (a) using the naked eye and (b) using a telescope with a 4.5-m diameter mirror. Use the following data: diameter of pupil = 5.0 mm; wavelength of light = 550 nm.
You are designing a lathe motor, part of which consists of a uniform cylinder whose mass is 90 kg and whose radius is 0.40m that is mounted so that it turns without friction on its axis, which is fixed.
NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of the satellite is 740 kg. How much gravitational force does the satellite experience
q1. an aluminum cup contains 225 g of water and a 40-g copper stirrer all at 27degc. a 400-g sample of silver at an
A 4.00 kg block is free from rest 2.0m high at the top of a 30 degree frictionless incline. The block makes a head-on elastic collision with another 3.00 kg block initially at rest on a horizontal surface at the bottom of the incline.
Jonathan is riding a bicycle and encounters a hill of height h. At the base of the hill, he is traveling at a speed vi. What is the change in potential energy stored in Jonathan's body
A stone with a mass of 0.80 kg is attached to one end of a string 0.900 m long. The string would break if its tension exceeds 600-N.
Calculate the force between two objects that have masses of 70 kg and 2,000 kilograms separated by a distance of 1 meter. Calculate the force between two touching grapefruits each with a radius of 0.08 meters and a mass of 0.45 kilograms.
A 410 W Carnot engine operates between constant-temperature reservoirs at 98°C and 49°C. find the rate at which energy is exhausted by the engine as heat
A figure skater is spinning at a rate of 1.0 rev/s with her armsout stretched. What is her new rate of rotation
A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.28*10^2 m/s from the top of a cliff 140 m above level ground, What is the initial total mechanical energy of the projectile
A particle whose mass is 6.0 grams and whose charge is 5 nC is released from rest when it is 20 cm from a second particle of charge 8 C. Find the magnitude of the particle's initial acceleration
Calcium has a work function of 2.8 eV. If light of frequency 4.3 1015 Hz strikes the surface of calcium, what is the energy of the ejected electrons
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