Answer:
-75 cm
Explanation:
At l ; F = 350 Hz
At l + 15 cm ; F = 280 Hz
I = 350
I + 15 = 280
280I = 350(I + 15)
280I = 350I + 5250
280I - 350I = 5250
-70I = 5250
I = - 75cm
The length is - 75 cm
F = m • a
What we know:
- Gravity: 9.8 m/s
- Force: 490 N
Equation derived:
m = F/a
m = 490/9.8
= 50 kg
B) no light pass through
Explanation:
An opaque material is a material that does not allow light to pass through. Opaque materials are the most common materials, they do not allow light to pass through.
- All opaque materials will cast shadows along their path when there is a screen.
- Transparent materials allows light to pass through for example glasses.
- Translucent materials allows light to go through partially.
Learn more:
Transmission of light brainly.com/question/8032392
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Answer:
The neddle of the galvanometer will move to the right at a faster speed.
Explanation:
Given:
The north pole of a bar magnet is moving towards a solenoid and the needle of the galvanometer moves to the left.
When a bar magnet has a relative deisplacement with respect to a solenoid, then it will induce some emf within the solenoid according to Faraday's law. When the north pole is moving towards the solenoid it will induce a current.
When the bar magnet is moving away from the solenoid at a faster speed, the rate of change of flux in the solenoid is faster. So the induced current will change in faster way, but in the opposite direction.
Thus, the neddle of the galvanometer will move to the right at a faster speed.
