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1 year ago

12

A crowbar 27 in. long is pivoted 8 in. from the end. What force must be applied at the long end in order to lift a 600 lb object

at the short end?

1 answer:

Fynjy0 [20]1 year ago

5 0

pivot = 8 in

Balance lenght = 27 in - 8 in = 19 in

Load x load arm = Force x force arm

Replacing:

600 lb * 8 in = F * 19

Solve for F

F = 600 * 8 / 19

F= 252.6 lb

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What term is used to describe all of the wavelengths of light waves?

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In Part 6.2.2, you will determine the wavelength of the laser by shining the laser beam on a "diffraction grating", a set of reg

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3 years ago

A 2000 kg car accelerates from 0 to 25 m / s in 21.0 s. How much is the average power delivered by the motor? (1 hp = 746 W)

mash [69]

Answer: 40.2 hp

Explanation:

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3 years ago

Read 2 more answers

In grinding a steel knife blade (specific heat = 0.11 cal/g-c),the metal can get as hot as 400C. If the blade has a mass of 80g,

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Answer:

33 g.

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As we have a limit for the maximum temperature of both elements (once reached a final thermal equilibrium), of 100ºC, which means that the maximum allowable change in temperature will be of 300º C for the knife, and of 80º C for the water.

Empirically , it has been showed that for a heat exchange process using only conduction, the heat needed to raise the temperature of a body, is proportional to the mass, being the proportionality constant a factor that depends on the material, called specific heat.

So, we can write the following equation:

cs*mk*Δtk = cw*mw*Δtw

Replacing by the givens of the question, we have:

0.11 cal/gºC * 80 g * 300ºC = 1 cal/gºC*mw*80ºC

Solving for mw = 2,640 cal / 80 cal/g =33 g.

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3 years ago