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zhannawk [14.2K]
3 years ago
11

How long would it take a 4,560 watt motor to raise a 166 kg piano to an apartment window

Physics
1 answer:
IrinaK [193]3 years ago
8 0

Answer:

Explanation:

We need the power equation here:

P = W/t where W is work and is defined as

W = F*displacement.

Force is a measure in Newtons, which is also weight. We have the mass of the piano, but we need to find the weight:

w = mg so

w = 166(9.8) so

w = 1600N, rounded to the correct number of sig dig. We use that now in the power equation:

4560=\frac{(1600)(15)}{t} and isolating the unknown:

t=\frac{(1600)(15)}{4560} so

t = 5.3 seconds

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The photon energies used in different types of medical x-ray imaging vary widely, depending upon the application. Single dental
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A) 5.0\cdot 10^{-11} m

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B) 2.0\cdot 10^{-11} m

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\lambda=\frac{hc}{E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1\cdot 10^{-14}J}=2.0\cdot 10^{-11} m

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