deepspy599otchpd

25.01.2020 • 

Physics

According to the information in your study unit, which of the following locations requires the highest illuminance? a. a residential stairway b. a study area c. a school locker room d. a bank lobby 6. an object is located 51 millimeters from a diverging lens. the object has a height of 13 millimeters and the image height is 3.5 millimeters. how far in front of the lens is the image located? a. 1.12 millimeters b. 51 millimeters c. 189 millimeters d. 13.7 millimeters 7. which one of the following scientists did not study the properties of light? a. einstein b. newton c. kepler d. maxwell 8. the portion of a light ray that falls on a surface is a/an a. diffuse reflection. b. specular reflection. c. reflected ray. d. incident ray. 9. if the distance from a converging lens to the object is less than the focal length of the lens, the image will be a. virtual, upright, and larger than the object. b. virtual, upright, and smaller than the object. c. real, inverted, and larger than the object. d. real, inverted, and smaller than the object.

Ответ:

BLASIANNkidd

06.01.2021

Physics

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Force F = 280 N Angle with the ground = 40 degrees Weight of the Lawnmower = 350 N Velocity is constant so Acceleration is 0 So Forward force Ff = F cos theta = 280 cos40 Frictional force with resists to back Fb = (u x Force from pressure) + vertical component of Force, where u is the coefficient of friction. Fb = (u x m x g) + (u x 280sin40) AS Ff = Fb => 280 cos40 = u x ((m x g) + 280sin40) u = 280 cos40 / ((350 x 9.81) + 280sin40) = 214.49 / () = 0.405 So the coefficient of friction u = 0.405

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