Which of the following in NOT an acceleration unit? List all that apply

1 answer:

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An acceleration unit needs a unit of length or distance on top and a unit of (time · time) on the bottom. Let's go through the list:

- km/hr/s = (km) / (hr · sec) . . . Yes

- km/hr/hr = (km) / (hr · hr) . . . Yes

- m/s² = (m) / (sec · sec) . . . Yes

- <em>km/s = (km) / (sec)</em> . . . No . . . This is the only one that's NOT acceleration. This one is actually a unit of <em>speed</em> .

- m/s/s = (m) / (s · s) . . . Yes

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A 500 W hair dyer is used to dry hair for 6 minutes a day for 3 days. How much energy is used? A laptop uses 75 W. The cot of el

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Answer:

See the answers below.

Explanation:

We will solve this problem by calculating each part separately.

A 500 W hair dyer is used to dry hair for 6 minutes a day for 3 days.

Energy can be calculated by multiplying the value of the power of the equipment by the amount of time of use.

$500 [W]*[\frac{6min}{1day} ]*[\frac{1day}{24hr} ]*[\frac{1hr}{60min} ]=2.083 [W]$

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We know that the power of the latop is 75 [W], then we can calculate the cost, multiplying the value of the power by the value of the cost by the time of use of the computer.

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Efficiency is defined as the relationship between the energy obtained on the energy delivered. Almost always the energy delivered is greater than the energy obtained (first law of thermodynamics).

Therefore.

$Effic = E_{obtained}/E_{delivered}\\0.85=E_{obtained}/1200\\E_{obtained}=1020[J]$