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Drupady [299]
3 years ago
13

What is the power p supplied to a resistor whose resistance is r when it is known that it has a voltage δv across it?

Physics
1 answer:
enyata [817]3 years ago
4 0
... power p supplied to a resistor whose resistance is r when it is known that it has a voltage δv across ... supplied to a resistor whose resistance
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Light energy is not kinetic energy
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In the metric system, the appropriate unit for weight is the _____. gram newton newton/cm2 gram/cm3
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Answer:

Newton

Explanation:

The earth attracts every body towards its centre. The force with which the earth attracts any body towards its centre, is called its weight.

It is a vector quantity.

It always acts towards the centre of earth.

The SI unit of Newton.

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3 years ago
Two converging lenses are separated by 27.0 cm. The focal length of each lens is 8.90 cm. An object is placed 33.0 cm to the lef
Ymorist [56]

Answer:

1/i + 1/o = 1/f     thin lens equation

i = 33 * 8.9 / (33 - 8.9) = 12.2 cm  to right of first lens

27 - 12.2 = 14.8 cm to left of second lens

i = 14.8 * 8.9 / (14.8 - 8.9) = 22,3 cm to right of second lens

7 0
2 years ago
A car with a mass of 1,200 kg travels a distance of 150 m as it moves from
vfiekz [6]

Answer: A

Explanation: JUST DID IT ON APEX

4 0
3 years ago
At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position xo = -.33 m from the equilibrium position of the
Ber [7]

Answer:

0·149 s

Explanation:

Initially at t = 0 s, velocity of the block = v = 2 m/s and x_{0} = - 0·33 m from the equilibrium position of the spring

Spring constant k = 61·2 N/m

Acceleration of the block at any instant of time = - (k × x) ÷ m

<h3>As acceleration of the block depends on x and acts in opposite direction to the motion of the block</h3><h3>The motion of the block will be simple harmonic motion</h3><h3>Then the equation of motion = x = A × sin(w × t + c)</h3>

Where x is the distance of the block from equilibrium position

A is the amplitude( that is maximum distance from the equilibrium position)

w is the angular frequency

t is the time taken

c is any constant

<h3>For simple harmonic motion a = - w² × x</h3>

- w² × x =  - (k × x) ÷ m

From the above equation w = √(k ÷ m) = √(61·2 ÷ 5) = 3·499 rad/s

By substituting the values in the given equation

- 0·33 = A × sin(c) → equation 1

By differentiating the equation x = A × sin(w × t + c) with respect to t on both sides

v = A × w × cos(w × t + c)

By substituting the values

2 = A × w × cos(c) → equation 2

By dividing the equation 1 and equation 2

- (0·33 ÷ 2) × w = tan(c)

tan(c) = - 0·577

⇒ c = π - inverse of tan(0·577)

∴ c = π - 0·523 rad

Substituting the value of c in equation 1

- 0·33 = A × sin(π - 0·523)

∴ A = - 36·67 m

∴ x = - 36·67 × sin(3·499 × t + π - 0·523)

At x = 0

sin(3·499 × t + π - 0·523) = 0

∴ 3·499 × t + π - 0·523 = 0 or π

It can't be 0 because if it is 0, then t is negative

∴ 3·499 × t + π - 0·523 = π

3·499 × t = 0·523

∴ t = 0·523 ÷ 3·499 = 0·149 s

∴ Here t_{1} = 0·149 s

7 0
3 years ago
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