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Karolina [17]
3 years ago
15

Brian is at school and wants to walk home. How far and in what direction should he travel?

Physics
1 answer:
FromTheMoon [43]3 years ago
4 0
You need to give the measurements
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What energy change takes place when the wrecking ball strikes the wall?
Ilia_Sergeevich [38]

Answer:

D

Explanation:

The wrecking ball transfers kinetic energy to the wall.

3 0
2 years ago
An inductor is connected to a 26.5 Hz power supply that produces a 41.2 V rms voltage. What minimum inductance is needed to keep
alexira [117]

Answer:

The minimum inductance needed is 2.78 H

Explanation:

Given;

frequency of the AC, f = 26.5 Hz

the root mean square voltage in the circuit, V_{rms} = 41.2 V

the maximum current in the circuit, I₀ = 126 mA

The root mean square current is given by;

I_{rms} = \frac{I_o}{\sqrt{2} } \\\\I_{rms}  = \frac{126*10^{-3}}{\sqrt{2} }\\\\I_{rms}  =0.0891 \ A

The inductive reactance is given by;

X_l = \frac{V_{rms}}{I_{rms}} \\\\X_l= \frac{41.2}{0.0891}\\\\X_l = 462.4 \ ohms

The minimum inductance needed is given by;

X_l = \omega L\\\\X_l = 2\pi  fL\\\\L = \frac{X_l}{2\pi f}\\\\L = \frac{462.4}{2\pi *26.5}\\\\L = 2.78 \ H

Therefore, the minimum inductance needed is 2.78 H

7 0
3 years ago
PLEASE HELP i really need help with these
enyata [817]

Answer:

21

Explanation:

IDK

7 0
3 years ago
Read 2 more answers
In a certain process, the energy of the system decreases by 250 kJkJ. The process involves 480 kJkJ of work done on the system.
BigorU [14]

Answer:

-730KJ

Explanation:

According to the first law of thermodynamics;

Let the total energy of the system be ∆E

Let heat be q and let work the w

Since the energy decreases ∆E is negative

Since work is done on the system w= positive

So;

- 250 = 480 + q

q = -250 - 480

q=-730KJ

5 0
3 years ago
If this wave has frequency of 15 hz. what is the wavelength of that wave ?
Aneli [31]
Do you have any other information? Like the velocity of the wave?
4 0
3 years ago
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