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4 years ago

When you step inside a warm ski lodge on a cold day, you find your glasses fog. why does this occur?

1 answer:

5 0

Answer: Condensation of moisture in the air onto the glasses.

Explanation:
When you come from a cold environment into a warm ski lodge, the glasses are at a much lower temperature than that of the lodge.
Because the air in the room contains moisture (water vapor), it condenses on a surface whose temperature is lower than the dew point of the room.

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An object has a mass of 50.0 g and a volume of 10.5 cm3. What is the object's density?

givi [52]

Divide the objects mass by its volume. 50.0g / 10.5cm^3 =4.76cm ^3

8 0

3 years ago

Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of 18.0 cm and carries a

Helen [10]

Answer:

Explanation:

The wires are in circular shape . They have common center .

magnetic field due to circular wire is given by the formula

B = $\frac{\mu_0\times I }{2r}$

where I is current , r is radius of the coil .

magnetic field due to inner wire

= $\frac{\mu_0\times 10 }{2\times.09}$

magnetic field due to outer wire

= $\frac{\mu_0\times I }{2\times.15}$

These should be equal and opposite so that by cancelling each other , they create zero field.

$\frac{\mu_0\times 10 }{2\times.09}$ = $\frac{\mu_0\times I }{2\times.15}$

I = 16.66 A

Direction of current should be in opposite direction ie anticlockwise when looking from above.

6 0

4 years ago

A small, dense center that has a positive charge and is surrounded by moving electrons

timama [110]

A small dense centre that has a positive charge and is surrounded by moving electrons is called an Atomic Nucleus.

7 0

4 years ago

A ball on a string makes 25.0 revolutions in 9.37 s, in a circle radius 0.450 m. What is it’s velocity?

Sauron [17]

The velocity of the ball is 12.5 m/s

Explanation:

The velocity of the ball is given by the ratio between the distance covered by the ball and the time taken:

$v=\frac{d}{t}$

First, we calculate the distance covered. We know that the radius of the circle is

r = 0.450 m

And the length of the circumference is

$L=2\pi r = 2\pi(0.750)=4.7 m$

The ball makes 25.0 revolutions, so a total distance of

$d=(25.0)L=(25.0)(4.7)=117.5 m$

In a time of

t = 9.37 s

So, its velocity is

$v=\frac{117.5}{9.37}=12.5 m/s$

Learn more about velocity here:

brainly.com/question/5248528

#LearnwithBrainly

3 0

3 years ago

Read 2 more answers

Question 27 (Mandatory) (11 points)

Lostsunrise [7]

Groups

Same number of valence electrons

Li, Na, K

Explanation:

If the periodic table is not color coded, the groups of elements gives the arrangement of atoms with the same chemical properties.

All elements that are in the same group have the same chemical properties.

Periodic table groups are also called family. They are the vertical columns on the periodic table.

Elements that same number of electrons in outermost shell have the same chemical properties.

The outermost shell is called the valence shell of an atom.

They are the shell containing the most loosely held electrons. Group 1 has just one electron in their outermost shell.

Li Na k group 1

F Cl Br group 7

learn more:

Periodic table brainly.com/question/2014634

Groups brainly.com/question/2690837

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4 0

4 years ago