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4 years ago

Can y'all please help me with this question

Physics

1 answer:

VladimirAG [237]4 years ago

6 0

Answer:

D) Magma with low viscosity

Explanation:

Pressure is needed for a volcanic eruption to occur. When the viscosity or thickness of the magma is low or absent, only a limited amount of pressure can build within the magma chamber, resulting in a less than spectacular eruption.

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Please help asap. I'm terrible with atoms

11Alexandr11 [23.1K]

<span>Correct answer: more, smaller</span>

6 0

3 years ago

Read 2 more answers

Explain why humans get an electric shock when the touch live wire ?

erastovalidia [21]

Answer:

look it up

Explanation:

An electrical shock is received when electrical current passes through the body. ... Whenever two wires are at different voltages, current will pass between them if they are connected. Your body can connect the wires if you touch both of them at the same time. Current will pass through your body.

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2 years ago

At room tmeperature none of the metals are

Masja [62]

What metal is not at room temperature?

Mercury is a metallic chemical element that is an only metal that is not a solid at room temperature.

6 0

2 years ago

A cup of hot coffee initially at 95 degrees C cools to 80 degrees C in 5 min while sitting in a room of temperature 21 degrees C

Oksana_A [137]

Answer:

When the temperature of the coffee is 50 °C, the time will be 20.68 mins

Explanation:

Given;

The initial temperature of the coffee T₀ = 95 °C

The temperature of the room = 21°C

Let T be the temperature at time of cooling t in mins

According to Newton's law of cooling;

$\frac{dT}{dt} \alpha (T-21)\\\\\frac{dT}{dt} = k (T-21)\\\\\frac{dT}{T-21} = kdt\\\\\int\limits {\frac{dT}{T-21}} = \int\limits kdt\\\\Log(T-21) =kt + Logc \\\\Log (\frac{T-21}{c} ) = kt\\\\T -21 = ce^{kt}\\\\At \ t = 0, T = 95\\\\95-21 = ce^0\\\\74 = c\\\\New, equation: T -21 = 74e^{kt}\\\\Again; when \ t= 5\ min, T = 80\\\\80 -21 = 74e^{5k}\\\\59 = 74e^{5k}\\\\e^{5k} = \frac{59}{74}\\\\ 5k = ln(\frac{59}{74})\\\\5k = -0.2265\\\\k = -0.0453$

When the temperature is 50 °C, the time t in min is calculated as;

$T -21 = 74e^{-0.0453t}\\\\50 -21 = 74e^{-0.0453t}\\\\29 = 74e^{-0.0453t}\\\\\frac{29}{74} = e^{-0.0453t}\\\\0.39189 = e^{-0.0453t}\\\\ln(0.39189 ) = {-0.0453t}\\\\-0.93677 = {-0.0453t}\\\\t = \frac{-0.93677}{-0.0453}\\\\ t = 20.68 \ mins$

Therefore, when the temperature of the coffee is 50 °C, the time will be 20.68 mins

4 0

3 years ago

The path of a beam of light from the sun to your eye when you are wearing sunglasses

MrMuchimi

Can still cause u to get blind Sunglasses don't always work

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4 years ago

Can y'all please help me with this question​

Can y'all please help me with this question