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The far point of a nearsighted person is 5.0m from her eyes, and she wears contacts that enable her to see distant objects clearly. A road sign is 20.0m away and 2.5m high, (a) When she looks through the contacts at the sign, what is its image distance? (b) How high is the image formed on the retina?
A satellite has a geo-synchronos orbit around the earth. How far is it above the earth's surface
A solid (cylindrical) flywheel of mass m and radius r is initally at rest. A force F acts tangentially on its perimeter for a time t. Show that its angular velocity at t = 2Ft/mr . Illustrate what is its angular displacement during that time?
A 18.60 kg piece of zinc at 75 degrees Celsius is placed in a container of water. The water has a mass of 20 kg and has a temperature of 10.10 degrees Celsius before the zinc is added. What is the final temperature of water and zinc.
a drawbridge with a weight of 5000 n is supported by a hinge and rope and is in static equilibrium. the length of the drawbridge, l, is 5 meters, what is the tension force the rope provides
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 62.9 N, Jill pulls with 87.7 N in the northeast direction, What is the direction of the net force
You have a concave spherical mirror with a 13.3-cm radius of curvature. You place an object on the mirror\'s axis, How far is the object's image from the mirror
At the end of an amusement park ride, you want the gondola to stop without the acceleration exceeding 2 g's. what is the maximum allowed braking force
What is the muzzle velocity
A syringe with a barrell with a diameter of 0.20 m is filled with water. What is the speed of the jet of water out of the syringe
A power plant that uses the temperature gradient of the ocean has been proposed. The system is to operate between 21°C (surface temperature) and 6°C (water temperature at a depth of about 1 km).
A pump uses a piston of 15 cm diameter which moves 2 cm/s. What is the fluid velocity of a tube 3mm in diameter
A weight of 200 N is hung from a spring with a spring constant of 2500 N/m and lowered slowly. How much will the spring stretch
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