4 years ago

What does it mean for a substance to have a high reactivity?

1 answer:

7 0

Reactivity is the tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy.

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How much heat does a freezer need to remove from 1kg of water at 40°C to make ice at 0°C? (You will need to use the specific hea

Montano1993 [528]

Answer:

Explanation:

Q = m c Δt

heat withdrawn to lower temperature by 40° C

Q = 1 X 1000 X 40 = 40,000 calories.

Q = mL

heat withdrawn to freeze water at 0°C to ice

= 1 x 80000 = 80,000 calories

total heat to be withdrawn = 120,000 calories. = 120,000 x 4.2 = 504 ,000 Joules.

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3 years ago

A 580-mm long tungsten wire, with a 0.046-mm-diameter circular cross section, is wrapped around in the shape of a coil and used

Bad White [126]

Answer:

$N=1.64\times10^{19}$

$R=19.54\Omega$

$V=10.28V$

Explanation:

By definition $I=Q/t$ , so we can calculate the total charge that went through the filament since we know the electric current and the time. If the charge of one electron is e, then the total charge will be given by Q=Ne. Combining these equations we get the number of electrons as:

$N=\frac{Q}{e}=\frac{It}{e}=\frac{(0.526A)(5s)}{1.602\times10^{-19}C}=1.64\times10^{19}$

Since the resistivity of tungsten (W) is $\rho_W=5.6
\times10^{-8}\Omega m$ , then resistance can be calculated using the formula:

$R=\rho_W\frac{L}{A}=\rho_W\frac{L}{\pi r^2}=(5.6\times10^{-8}\Omega m)\frac{(0.58m)}{\pi (0.000023m)^2}=19.54\Omega$

Where we already obtained the radius from the diameter. Finally the Voltage will be given by the formula:

$V=RI=(19.54\Omega)(0.526A)=10.28V$

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3 years ago

Ramon is playing soccer. The ball comes straight at him, and he kicks it to a player on his right. His kick is an example of

monitta

I believe your answer is d).

Hope you find this helpful! :)

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4 years ago

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Aluminum allows for the flow of electrons, while glass does not. Would an aluminum wire surrounded by glass be an effective desi

pantera1 [17]

answer

Explanation:

I do not think that I would because even though its a conductor in the insulator I think it would insulate it before it will work (not sure if that makes sense)

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2 years ago

Please help! A Boeing 747 aircraft has a landing speed of 72 m/s , and upon landing it is able to come to a stop in 2, 000m . As

Andre45 [30]

27.8 seconds is how long it would take to land

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3 years ago