Physics, 14.08.2021 14:00, richard376
A pinhole camera is made from an 78 cm -long box with a small hole in one end. If the hole is 5.2 m from a 1.7 m -tall person, how tall will the image of the person on the film be?
Answers: 3
Physics, 22.06.2019 00:30, powberier6979
Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedesโ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.
Answers: 2
Physics, 22.06.2019 12:00, jazz8224
The sunโs mass is 2.0ร10^ 30 kg, its radius is 7.0ร10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5ร10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?
Answers: 3
Physics, 22.06.2019 21:10, bri9263
Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius ํ
=0.381meters and mass ํ=3.1ํํ. initially ํ"is on the ground and ํ#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of ํ#just before it strikes the ground. assume the pulley bearing is frictionless.
Answers: 2
A pinhole camera is made from an 78 cm -long box with a small hole in one end. If the hole is 5.2 m...
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