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julsineya [31]
3 years ago
7

Calculate how long

Physics
1 answer:
lora16 [44]3 years ago
3 0

Alpha Centauri is 4.4 lightyears away. Traveling at 1/10 speed of light it would take you 44 years.

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A computer cooled by a fan contains eight PCBs, each dissipating 10W power. The height of the PCBs is 12 cm and the length is 18
Fantom [35]

Answer:

a) The flow rate of the air is 0.0104 kg/s

b) The fraction of the temperature is 23.91%

Explanation:

a) Given:

N = Number of PCBs = 8

Q = heat dissipated = 10 W

W = power supplied = -25 W

ΔT = rise temperature = 10°C

The total amount of heat dissipated is equal to:

Q_{T} =N*Q=8*10=80W

The expression of conservation of energy is:

E_{in} =E_{out} \\Q_{T} +m_{in} h_{in} =m_{out} h_{out} +W\\m_{in}=m_{out} m_{air},(mass-balance)\\Q_{T}=m_{air}(h_{out} -h_{in})+W\\h=CpT\\Q_{T}=m_{air}Cp(T_{out} -T_{in})+W

Replacing:

80=m_{air} *1.005x10^{3} *10+(-25)\\m_{air} =0.0104kg/s

b) The amount of heat is equal:

Q_{fan} =m_{air} Cp*delta-T\\25=0.0104*1.005x10^{3} *delta-T\\delta-T=2.391C

The fraction of the temperature is:

f=\frac{2.391}{10} *100=23.91%

8 0
4 years ago
At t=0, a stone is dropped from a cliff above a lake; 1.6 s later another stone is thrown downward from the same point with an i
padilas [110]
<span>Let equation A be
h=ut+<span>12</span>g<span>t2 </span></span> for 1st stone:

<span>h=<span>12</span> g<span>t2

</span></span>eq.-(A) for 2nd stone:

<span>h=32m/s(t−1.6s)+<span>12</span>g(t−1.6s<span>)2

</span></span><span>h=32m/s∗t−51.5m+<span>12</span>g<span>t2</span>+12.544m−15.68m/s∗t

</span> <span>h=16.32m/s∗t+h−38.656m

</span> <span>t=2.3686s

</span> now putting the value of t in eqn. A <span><span>h=27.49m</span></span>
6 0
3 years ago
Read 2 more answers
How can I connect projectile motion into inclines. plsss give me ideas
Alenkasestr [34]

Answer:

Explanation:

Initial launch angle, θ

Initial velocity, u.

Time of flight, T.

Acceleration, a.

Horizontal velocity, vx.

Vertical velocity, vy.

Displacement, d.

Maximum height, H.

4 0
4 years ago
Who could explain the phenomenom of interference of light?​
Likurg_2 [28]

Answer:

When the waves reflected from the inner and outer surface combine they will interfere with each other, removing or reinforcing some parts of white light by destructive or constructive interference. ... This results in color.

Explanation:

this is what we studied

so basically  there is like a surface

and 2 different waves coming out of the same source

they will combine and start removing parts of the white light (which originally consists of 6 to 7 colors)

results in showing these colors

6 0
3 years ago
Technician A says that the starter motor used to crank diesel engines can draw up to 400 amps of current. Technician B says that
Aleks04 [339]

Answer: Option A : Technician A

Explanation:

The statement/observation, "that the starter motor used to crank diesel engines can draw up to 400 amps of current" made by Technician A is correct.

A diesel engine uses up to 400+ Amperes of electricity to start up a diesel engine in the ignition chamber of motor engine.

8 0
4 years ago
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