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3 years ago

Explain what is meant by the term mechanical advantage.

Physics

2 answers:

Arisa [49]3 years ago

8 0

Answer:

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system.

Explanation:

Cloud [144]3 years ago

7 0

Answer:

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system.

Explanation:

got it right on edge 2020

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How to find final kinetic energy given height, mass, distance, and velocity.

Orlov [11]

Answer:

KE = 1/2(m)(v^2)

Explanation:

You only need mass and velocity to find kinetic energy

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3 years ago

True or False: An example of an Isometric movement is a plank. please help 2 mins left!<br> PE

Anon25 [30]

Answer:

Yes

Explanation:

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3 years ago

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UkoKoshka [18]

Answer:

okay

Explanation:

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3 years ago

Classify each model A-D as either an element, a compound, or a mixture. Explain your reasoning for each answer

ANEK [815]

Answer:

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2 years ago

The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash

Reil [10]

Answer:

$3.3\cdot 10^{15}$

Explanation:

First of all, let's calculate the energy of a single photon of wavelength

$\lambda=550 nm=5.5\cdot 10^{-7}m$

which is given by

$E_1 = \frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{5.5\cdot 10^{-7} m}=3.6\cdot 10^{-19} J$

The power of the flash is

$P=1.2 mW=0.0012 W$

and the time it lasts is

$t=100 ms=0.1 s$

so the total energy delivered in one flash is

$E=Pt=(0.0012 W)(0.1 s)=1.2\cdot 10^{-3}J$

This energy contains exactly N photons each of energy $E_1$ , so the number of photons emitted in one flash is

$N=\frac{E}{E_1}=\frac{1.2\cdot 10^{-3} W}{3.6\cdot 10^{-19}J}=3.3\cdot 10^{15}$

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3 years ago