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Leokris [45]
4 years ago
8

If you fall and skid to a stop on a carpeted floor, you can get a rug burn. Much of this discomfort comes from abrasion,but ther

e can also be a real burn where the skin was too hot. How does this happen?
Physics
1 answer:
just olya [345]4 years ago
3 0

Explanation:

When you run, your body has a kinetic energy  and when you fall while running, the friction between the carpet and your foot, transforms the kinetic energy into thermal energy or heat energy. This can even cause, real burn if the skin were too hot.

You might be interested in
What is kinetic friction?
Lunna [17]

Answer:

Kinetic friction is an inhibitory force that is present when a body or object begins to move. It should be noted that this force is in the opposite direction to the movement of the body that slides with respect to a surface and parallel to that surface.

In addition, this friction varies according to the surface characteristics and the material properties of the bodies that slide in this surface. Being quantified by the coefficient of kinetic friction \mu_{K}, which is dimensionless.

4 0
4 years ago
 A balloon is 3m in diameter and is filled with 5 kg of N2. Find the specific volume of the gas in the balloon. Express it in bo
enyata [817]

Answer:

The the specific volume and weight are 79.16m³/k mol and 49 N.

Explanation:

Given that,

Diameter = 3 m

Mass of N₂ = 5 kg

We need to calculate the volume of balloon

Using formula of volume

V= \dfrac{4}{3}\pi r^3

V= \dfrac{4}{3}\pi \times{\dfrac{d}{2}}^3

V= \dfrac{4}{3}\pi \times(\dfrac{3}{2})^3

V=14.137\ m^3

We need to calculate the specific volume in the balloon

Specific\ volume=\dfrac{Volume}{mass}

Specific\ volume=\dfrac{14.137}{5}

Specific\ volume=2.8274\ m^3/kg

Now, Molar mass of N₂ gas is 0.028 kg/mol

Now, Specific volume of N₂ gas in the balloon is

Specific\ volume =0.028\times2.8274=0.0791672\ m^3/mol

Specific\ volume =79.16m^3/kmol

(b). We need to calculate the weight of the gas in the balloon

Weight of the balloon is dependent on the mass of the gas.

The weight of the gas is given by

W = mg

W = 5\times9.8

W = 49\ N

Hence, The the specific volume and weight are 79.16m³/k mol and 49 N.

7 0
4 years ago
One statement of the first law of thermodynamics is that:___________.
blagie [28]

Answer:

a. the amount of work done on a system is dependent of pathway

Explanation:

The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system.

ΔU = Q - W

Where;

Q, the net heat transfer into the system depends on the pathway

W, the net work done by the system also depends on the pathway

But, ΔU, the change in internal energy is independent of pathway

Therefore, the correct option is "A"

a. the amount of work done on a system is dependent of pathway

6 0
3 years ago
a paratrooper jumps out of a plane and opens her parachute shortly afterward. 10 seconds later the upward force on the parachute
Flura [38]

Answer:

Acceleration = 2.45 m/s²

Explanation:

The resultant vertical force on the paratrooper = ma = upward force - total weight of both the parachute and the

Ma = W - Fu .............. Equation 1

Where Fu = upward force on the parachute, W = combined Weight of the parachute and the paratrooper

W = Mg......................... Equation 2

Making M the subject of formula

M = W/g...................... Equation 3

Where M = combined mass of the parachute and the paratrooper, g = acceleration due to gravity.

Given: W = 800 N, g = constant = 9.8 m/s²

Substituting these values into equation 3

W = 800/9.8

W = 81.63 kg.

<em>Also Given: Fu = 600 N, W = 800 N</em>

Substituting these values into equation 1

81.63a = 800 - 600

81.63a = 200

Dividing both side of the equation by the coefficient of a

81.63a/81.63 = 200/81.63

a = 2.45 m/s²

Therefore acceleration = 2.45 m/s²

<em></em>

3 0
3 years ago
Why does electricity cause climate change?
user100 [1]

It's not the electricity. It's how we produce it.

Solar panels, wind turbines, nuclear reactors, and water wheels can be used to produce electricity with no effect on climate.

Coal, oil, wood, gasoline, natural gas, household trash, and tall dry grass can be burned to boil water to make steam to turn a generator and make electricity. When everybody does that, the burning releases enough Carbon Dioxide into the atmosphere to futz up the Earth's climates. That's exactly what we have done for the past 200 years.

5 0
3 years ago
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