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RUDIKE [14]
3 years ago
12

When an electric current flows through a long conductor, each free electron moves

Physics
1 answer:
ki77a [65]3 years ago
7 0
A. through a relatively short distance.

The speed is actually called the drift speed of the electron.
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Does hot air rise? Why?
pashok25 [27]

Answer: Yes

Explanation:

does hot air rise

er substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used in the hot air balloons.

8 0
2 years ago
A hockey puck of mass m1=165 g slides from left to right with an initial velocity of 15.5 m/s. It collides head on with a second
Fynjy0 [20]

Answer:

it may be -6 m/s

Explanation:

3 0
3 years ago
Approximate the human form as an unclothed vertical cylinder of 0.3 m diameter and 1.75 m length with a surface temperature of 3
Zolol [24]

Answer:

q=1118.865W

Explanation:

From the question we are told that

Diameter of the cylinder D=0.3m

Length of the cylinder L=1.75m

Surface temperature of cylinder T_s=30 \textdegree C=303k

Speed of air V=10m/s

Temperature of air T=20 \textdegree C

Generally the equation for Reynolds number is mathematically given by

Re_D=\frac{VD}{v}

where

v=15.27*10^-^6

Re_D=\frac{10*0.3}{15.27*10^-^6}

Re_D=1.96*10^5

Generally the equation for Nusselt number is mathematically given by

N_u=0.6(Re_D)^{0.6}(Pr)^{0.37}

where

Prandtl number

Pr=0.71

N_u=0.6(Re_D)^{0.6}(Pr)^{0.37}

N_u=0.6(1.96*10^5)^{0.6}(0.71)^{0.37}

N_u=791.53

Generally the equation for convective heat transfer is mathematically given by

h=Nu \frac{k}{D}

where

k=25.7*10^{-3}

h=791.53*\frac{25.7*10^{-3}}{0.3}

h=67.81W/m^2K

Generally the equation for surface area of a cylinder is mathematically given by

A=\pi DL

A=\pi *0.3*1.75

A=1.65m^2

Generally the equation for convective heat transfer is mathematically given by

q=h4(T_s-T_{inty)}

q=(67.81)*1.65*(30-20)\\

q=1118.865W

3 0
2 years ago
How can I find the frequency of sound waves??
BigorU [14]

Answer:

divide the velocity of the wave by the wavelength. Write your answer in Hertz, or Hz, which is the unit for frequency. If you need to calculate the frequency from the time it takes to complete a wave cycle, or T, the frequency will be the inverse of the time, or 1 divided by T.

Explanation:

5 0
3 years ago
Jake and Reuben are practicing for their weightlifting meet at school.
hammer [34]

Answer:

no Jake arm is high so the weight of an object become high due to potential energy.

so, option A is correct ) Jake did more work

5 0
2 years ago
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