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3 years ago

Which heat transfer is warming your hands by the fire

Chemistry

2 answers:

lilavasa [31]3 years ago

7 0

Radiation is the heat transfer

Sever21 [200]3 years ago

4 0

A fire spreads by transferring heat energy in three ways: Radiation, Convection, and Conduction. Radiation refers to the emission of energy in rays or waves. ... It is the type of heatone feels when sitting in front of a fireplace or around a campfire. It travels in straight lines at the speed of light.

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Measurements indicate that boat A has twice the kinetic energy of boat B of the same mass. How fast is boat A traveling if boat

tresset_1 [31]

Answer:

The speed of the boat-A is 47.84 knots.

Explanation:

Mass of boat-A = m

Mass of boat-B = m

Kinetic energy if the boat-A = E

Kinetic energy if the boat-B = E'

Velocity of boat-A = v = ?

Velocity of boat-B = v'= 34 knots = 34 nautical miles /hour

1 knot = 1 nautical mile per hour

1 nautical mile = 6,076 feet

34 nautical miles /hour = 34 nautical miles /hour × 6,076 ft/miles = 205,564 ft/hour

Kinetic energy of boat-A is given by :

$E=\frac{1}{2}mv^2$

Kinetic energy of boat-A is given by :

$E'=\frac{1}{2}mv^2$ ..[1]

Kinetic energy of boat-B is given by :

$E'=\frac{1}{2}mv'^2$ ..[2]

E= 2E' (given)

[1] ÷ [2]

$\frac{E}{E'}=\frac{\frac{1}{2}mv^2}{\frac{1}{2}mv'^2}$

$\frac{2E'}{E'}=\frac{v^2}{v'^2}$

$2\times v'^2=v^2$

$2 \times (205,564 ft/hour)^2=v^2$

$8.4513\times 10^{10} ft^2/hour^2=v'^2$

$v'=290,711.4 ft/hour=\frac{290,711.4}{6,076} nautical mile/hour$

v' = 47.84 knots

The speed of the boat-A is 47.84 knots.

3 0

3 years ago

Can anyone help with thiss??

IrinaVladis [17]

l
kg
cm
gm
ml
km,m
m
nm
mg
ms
gm
nm
.
.
l,gm
.
kg
m
gm,m
s

Hope this helps :-). And....

ml: milliliter

kg: kilogram

m: meter

mg: milligram

mm: millimeter

ms: millisecond

l: liter

km: kilometer

µg: micro gram

cm: centimeter

g: gram

nm: nano meter

5 0

3 years ago

Julia did an experiment to study the solubility of two substances. She poured 100 mL of water at 20 °C into each of two beakers

Aleks [24]

Answer: The solubility of B is high than the solubility of A.

Explanation:

The solubility is defined as the amount of substance dissolved in a given amount of solvent. More the solute gets dissolved, high will be the solubility and less the solute dissolved, low will be the solubility.

For the given observations:

Mass of undissolved substance of substance A is more than Substance B at every temperature. This implies that less amount of solute gets dissolved in the given amount of solvent.

Hence, substance B has high solubility than substance A.

7 0

3 years ago

Read 2 more answers

You have a fixed container with a volume of 5.00l that contains 35.0 g nitrogen gas (n2). if the temperature is 298 k, calculate

Lunna [17]

Use the formula pv=nRt and you will get the answer

6 0

3 years ago

What types of elements- metals,

crimeas [40]

Answer:

Noble gases

Explanation:

The noble gases are non-metals that requires the highest amount of energy to remove an electron from their shells.

The reason for this difficult is that their electronic configuration confers a stable configuration them.

The ionization energy is the energy required to remove the most loosely held electrons in an atom.
Due to the special stability of noble gases, it is very difficult to remove electrons from an atom of noble gases.

7 0

3 years ago