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2 years ago

9

1- Kilogram is a unit of _ in __ system ?

1 answer:

Zanzabum2 years ago

4 0

Answer:

1.The kilogram is the base unit of mass in the International System of Units

2. a caliper

Explanation:

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What is the control group used for

LUCKY_DIMON [66]

Answer:

What is a Control Group? The control group (sometimes called a comparison group) is used in an experiment as a way to ensure that your experiment actually works. It's a way to make sure that the treatment you are giving is causing the experimental results, and not something outside the experiment

Explanation:

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3 years ago

Does DNA produce any particular traits?

coldgirl [10]

Answer:
yes, eye color, hair color etc.

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2 years ago

An air conditioner operating between 93°F and 70°F is rated at 4000 Btu/h cooling capacity. Its coefficient of performance is 27

lana [24]

Answer: $P_{in}=0.25\ Hp$

Explanation:

Given

Operating temperatures are

$T_L=70^{\circ}F\approx 294.261\ K$

$T_H=93^{\circ}F\approx 307\ K$

$COP$ is $27\%$ of Carnot refrigerator

$COP_{carnot}=\dfrac{T_L}{T_H-T_L}$

$COP_{carnot}=\dfrac{294.261}{307-294.261}$

$COP_{carnot}=\dfrac{294.261}{12.74}$

$COP_{carnot}=23.09\approx 23.1$

actual $COP=0.27 \times COP_{carnot}$

$COP_{actual}=6.237$

Also, $COP=\dfrac{\text{Desired effect}}{\text{Power in}}$

$6.237=\frac{4000}{P_{in}}$

$P_{in}=\frac{4000}{6.237}=641.33\ Btu/h$

$P_{in}=0.25\ Hp$

6 0

2 years ago

What is the length of a one-dimensional box in which an electron in the n=1 state has the same energy as a photon with a wavelen

Pie

Answer:

Length will be 0.491 nm

Explanation:

We have given wavelength of the photon $\lambda =800nm=800\times 10^{-9}m$

Plank's constant $h=6.6\times 10^{-34}J-s$

We know that energy of the photon is given by

$E=\frac{hc}{\lambda }=\frac{6.6\times 10^{-34}\times 3\times 10^8}{800\times \times 10^{-9}}=2.475\times 10^{-19}J$

We know that energy of photon is also given by

$E=\frac{n^2h^2}{8mL^2}=\frac{h^2}{8mL^2}$

$2.475\times 10^{-19}=\frac{(6.6\times 10^{-34})^2}{8\times 9.1\times 10^{-31}\times L^2}$

$L=0.491\times 10^{-9}m$

3 0

3 years ago

An 8.30 kg crate is pushed with a 17.7 N force. How fast does it accelerate?

kramer

Answer:

2.13m/s^2

Explanation:

Use equation:

Fnet=ma

If 17.7 is the netto force (Fnet) then you just substitute the values in and solve.

Note m is mass (kg) and a is acceleration (m/s^2)

4 0

3 years ago

Read 2 more answers