Physics, 18.04.2020 04:33, bmharris8262
A spiral staircase in a building is in the shape of a helix of radius 5 meters. Between two oors of the building, the stairs make one full revolution and climb by 4 meters. A person carries a bag of groceries up two oors. The combined mass of the person and the groceries is 70 kg and the gravitational force is 70g downward, where g is the acceleration due to gravity. Use a line integral to calculate the work done by gravity against the person.
Answers: 3
Physics, 22.06.2019 16:50, JeroMii
Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.
Answers: 2
Physics, 23.06.2019 08:30, coollid876
Answer on edg: what happens to the light coming from the sun? - scattering what happens to light on the surface of water? - specular reflection what happens to light on the surfaces of rocks? - diffuse reflection
Answers: 3
Physics, 23.06.2019 09:00, kalebrayburn62
When the acceleration of a mass on a spring is zero, the velocity is at a (fill in the blank) . when the velocity of a mass on a spring is zero, the acceleration is at a (fill in the blank) .
Answers: 1
A spiral staircase in a building is in the shape of a helix of radius 5 meters. Between two oors of...
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