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3 years ago

What are 3 examples of elastic collisions?

Physics

1 answer:

Andre45 [30]3 years ago

3 0

QUICK ANSWER

The collision between two gas molecules or billiard balls can be approximated as elastic collisions. Elastic collisions are exchanges of kinetic energy between two bodies having different reference frames in which the total kinetic energy of the two bodies after collision is equal to the energy before collision.'

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A copper rod has a length of 1.3 m and a cross-sectional area of 3.6 10-4 m2. One end of the rod is in contact with boiling wate

sdas [7]

To solve the problem it is necessary to apply the concepts related to heat flow,

The heat flux can be defined as

$\frac{dQ}{dt} = H = \frac{kA\Delta T}{d}$

Where,

k = Thermal conductivity

A = Area of cross-sectional area

d = Length of the rod

$\Delta T=$ Temperature difference between the ends of the rod

$k =388 W/m.\°C$ Thermal conductivity of copper rod

$A = 3.6 *10^{-4} m$ Area of cross section of rod

$\Delta T=100-0=100\°C$ Temperature difference

$d=1.3m$ length of rod

Replacing then,

$H = \frac{kA\Delta T}{d}$

$H = \frac{(388)(3.6 *10^{-4})(100)}{1.3}$

$H=10.7446J$

From the definition of heat flow we know that this is also equivalent

$H = \dot{m}*L$

Where,

$\dot{m} =$ Mass per second

$L = 334J/g$ Latent heat of fusion of ice

Re-arrange to find $\dot{m},$

$H = \dot{m}*L$

$\dot{m}=\frac{L}{H}$

$\dot{m}=\frac{334}{10.7446}$

$\dot{m} = 31.08g/s$

$\dot{m}= 0.032g/s$

Therefore the mass of ice per second that melts is 0.032g

7 0

3 years ago

A 10-kg wagon is pulled by a force of 70 Newtons while friction provides 20 Newtons of force. How much acceleration will the wag

kkurt [141]

Answer:

5m/s²

Explanation:

Given parameters:

Mass of wagon = 10kg

Force of pull = 70N

Frictional force = 20N

Unknown:

Acceleration of the wagon = ?

Solution:

Frictional force is a force that opposes motion.

The net force is given as:

Net force = mass x acceleration

Force of pull - Frictional force = mass x acceleration

Insert the parameters and solve;

70 - 20 = 10 x acceleration

50 = 10 x acceleration

Acceleration = 5m/s²

5 0

3 years ago

The two strength factors that relate to all three competitive forces are

notka56 [123]

I believe your answer is: Switching Costs & Customer Loyalty

7 0

4 years ago

Why is it important for a muscle to be attached to a fixed origin at one end and a moving insertion at the other? Discuss how th

vlabodo [156]

Muscles function only by contracting. This makes it necessary for one end of the muscle to be fixed and the other mobile.
Take the bicep for example.
Its origin is at the shoulder and its two heads connect to the bones of the forearm, the radius and ulna.
Now, had the muscle not been fixed at one end, and contracted, it would pull both our shoulder and forearm together resulting in an ineffective movement. The desired motion is to lift the forearm (proximal and distal movement) which can only be achieved if the bicep is fixed at the shoulder and allowed to move at the forearm.

6 0

3 years ago

An electric motor rotates 60 times per second if the alternating current source is 60 Hz. How many times will an electric motor

valentina_108 [34]

Answer:

180,000

Explanation:

Frequency is a quantity that is measured in Hertz [Hz] and it represents the number of rotations per second.

A motor with a frequency of 50 Hz will rotate 50 times per second.

Since we don't want to know how many times it rotates per second, but per hour. The first step is to find how many seconds there are in an hour and then multiply that amount by 50.

Seconds in an hour:

there are 60 seconds per minute, and 60 minutes per hour, thus there are

60*60 = <u>3,600 seconds in an hour</u>

We know that the motor will rotate 50 times per second so to find the number of rotations in 1 hour = 3,600 seconds we multiply:

50*3,600 = 180,000 rotations

8 0

3 years ago