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Pavlova-9 [17]
3 years ago
8

If a puddle of water is frozen, do the particles in the ice have kinetic energy? Explain.

Physics
1 answer:
TEA [102]3 years ago
8 0
They have some but not very much, the particles in the ice are still vibrating just not as much as in water. the only time a substance would have 0 kinetic energy is when that substance is at 0 degrees kelvin(absolute zero) so far no place in the universe has been recorded at absolute zero though
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Who was the first president of kenya​
Damm [24]

Answer: Jomo Kenyatta

Explanation: Jomo Kenyatta was an anti-colonial activist and politician and was the first Prime Minister of Kenya. He then served as president of the country from 1964 to his death in 1978

7 0
3 years ago
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An airplane has an effective wing surface area of 17.0 m2 that is generating the lift force. In level flight the air speed over
olga_2 [115]

To solve this problem it is necessary to apply the equations given from Bernoulli's principle, which describes the behavior of a liquid moving along a streamline. Mathematically this expression can be given as,

P_1 + \frac{1}{2}\rho*v_1^2 + P_2 + \frac{1}{2}*\rho*v_2^2=0

Where,

P_i = Pressure at each state

\rho= Density

v_i = Velocity

Re-organizing the expression we can get that

P_1 - P_2 = \frac{1}{2}\rho (v_2^2 - v_1^2)

Our values are given as

v_1 = 40m/s

v_2 = 55m/s

\rho_{water} = 1.2kg/m^3 \rightarrow Normal Conditions

Replacing we have,

P_1 -P_2 = \frac{1}{2}*1.2*(55^2-40^2)

P_1 - P_2 = 855Pa

If we consider that there is a balance between the two states, the Force provided by gravity is equivalent to the Support Force, therefore

F_l = F_g

Here the lift force is the product between the pressure difference previously found by the effective area of the aircraft, while the Force of gravity represents the weight. There,

F_g = W

F_l = (P_2-P_1)A

Equating,

(P_1 - P_2)*A = W

W = 855*17

W = 14535 N

Therefore the weight of the plane is 14535N

3 0
3 years ago
You are given a material which produces no initial magnetic field when in free space. When it is placed in a region of uniform m
seropon [69]

Answer:

This material exhibits paramagnetism.

Explanation:

A paramagnetic material has these features: It doesn’t have any magnetic properties when placed in an external magnetic field, it gains and then loses the magnetic property as the external field is removed.

Such materials have magnetic moments oriented in random directions, thus making the net magnetic moment, zero. But when placed in an external field, they do possess a net magnetic moment. When the magnetic field is removed, they lose the magnetic property.

Thus, the material which produces no initial magnetic field when placed in a uniform magnetic field produces an additional internal magnetic field parallel to the original field. Also, it loses the magnetic properties as soon as the external magnetic field is removed. Then, the magnetism the material exhibits is paramagnetic.

7 0
3 years ago
What wind turbines to hydroelectric dams and ethanol plants have in common?
Brut [27]

All three are forms of renewable energy.

Wind turbines utilize the wind to generate power, hydroelectric dams also do the same (although most states have stopped using them since they're bad for the environment)

Ethanol, a substitute for gasoline, comes from corn, which can be grown in farms throughout America.

8 0
2 years ago
A giant chorus of 1000 vocalists is singing the same note. Suddenly, 999 vocalists stop,leaving one soloist. By how many decibel
stiks02 [169]

Answer:

The decrease in decibels is 0.1 dB.

Explanation:

Let the intensity of one chorus is Io.

let the intensity of 1000 vocalist is dB.

The intensity of 1000 vocalist is 1000 Io.

dB = 10log\frac{1000Io}{Io}=30..... (1)

let the intensity of 999 vocalist is dB'.

dB' = 10log\frac{999Io}{Io}=29.9..... (2)

So, the change is

= dB - dB' = 30 - 29.9 = 0.1 dB

6 0
2 years ago
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