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MissTica
3 years ago
5

A lightbulb has a resistance of 285 ω when operating with a potential difference of 110 v across it. what is the current in the

lightbulb?
Physics
1 answer:
Doss [256]3 years ago
5 0

Current = voltage / resistance

             =   110 v / 285 Ω

             =      0.386 Ampere  (rounded)
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Electrons are important to electric current because they are able to
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Electrons are important to the electric current because they are able to move from one atom to another. When an atom loses an electron, it becomes positively charged and when an atom gains an electron, it becomes negatively charged.
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3 years ago
A boat heads directly across a river. Its speed relative to the water is 3 m/s. It takes it 539 seconds to cross, but it ends up
nikklg [1K]

Answer:

3.24 m/s

Explanation:

Suppose that the boat sails with velocity (relative to water) direction being perpendicular to water stream. Had there been no water flow, it would have ended up 0m downstream

Therefore, the river speed is the one that push the boat 662 m downstream within 539 seconds. We can use this to calculate its magnitude

v_r = 662 / 539 = 1.23 m/s

So the boat velocity vector relative to the bank is the sum of of the boat velocity vector relative to the water and the water velocity vector relative to the bank. Since these 2 component vectors are perpendicular to each other, the magnitude of the total vector can be calculated using Pythagorean formula:

v = \sqrt{v_b^2 + v_r^2} = \sqrt{3^2 + 1.23^2} = \sqrt{9 + 1.5129} = \sqrt{10.5129} = 3.24 m/s

5 0
3 years ago
It requires a force of 100 N to stretch a spring of negligible mass by a distance of 0.1 m. If the spring instead stretches a di
Mariana [72]

by the formula of spring force we know that

F = kx

here we know that

F = 100 N

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now we will have

100 = k \times 0.1

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now by similar way if the stretch in spring is 0.25 m

force is given by

F = kx

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5 0
3 years ago
Read 2 more answers
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Answer:

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In a gas, the molecules are in continuous, random, straight-line motion.

The molecules are independent of one another i.e The forces of attraction (cohesive forces) and repulsion between the molecules are small and negligible,As such they possess greater kinetic energy which allows them to break the force of attraction between them

In liquid, the molecules have a less random pattern of motion and they can only slide past one another.

In solid, the motion are restricted to a small place as the molecules are not free to move about but merely vibrate about their lattice points.

7 0
3 years ago
Which of the following actions in a car cause it to accelerate? Select all that apply.
Oksi-84 [34.3K]

Answer:

Option (b) will be correct answer for accelerating the car

Explanation:

For accelerating the car we have to speed up the car

In option (b) it is given that stepping on the gas pedal to speed up the car so it is correct answer

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3 years ago
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