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4 years ago

When a wire is made smaller, the resistance increases. Which happens to the electric current?

2 answers:

7 0

Well, you can pretty much see it with this formula :

I = V/R

If the resistance (R) is increased, the amount of I will be increased.

so the answer would be : A. The current decreases

hope this helps

lys-0071 [83]4 years ago

3 0

Answer:

Option A

Explanation:

Ohm's law state that at constant temperature, the current flowing through the conductor is directly proportional to the potential difference applied across the conductor.

V = IR

Where, V is the potential difference, I is the electric current and R be the resistance of the conductor.

As resistance increases, current should be decreases to keep the potential difference constant.

In the question, as potential difference is same, so current is decreases.

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A person opens a door by applying a 10-N force perpendicular to it at a distance 0.90m from the hinges.

quester [9]

You faded out there before asking your question.
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Torque = (force) x (distance from the pivot) = (10 n) x (0.9 m) = 9 newton-meters

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4 years ago

Un vehicle surt, en un instant, d'un punt A cap a un altre punt B amb una velocitat constant de 36 km/h. Després d'un minut(60 s

kati45 [8]

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3 years ago

An experiment on the earth's magnetic field is being carried out 1.00 m from an electric cable. What is the maximum allowable cu

Whitepunk [10]

Answer:

The allowed current in the cable is 1.15 A.

Explanation:

Given that,

Distance = 1.00 m

Suppose the magnetic field is $2.3\times10^{-5}\ T$ and if the experiment is to be accurate to 1.0 %

We need to calculate the current

Using formula of magnetic field

$B=\dfrac{\mu_{0}I}{2\pi r}$

$I=\dfrac{B\times2\pi r}{\mu_{0}}$

Put the value into the formula

$I=\dfrac{2.3\times10^{-5}\times2\times\pi\times1.00}{4\pi\times10^{-7}}$

$I=115\ A$

If the experiment is to be accurate to 1.0%

Then,

We need to calculate the allowed current in the cable

$I'=(1.0%)\times I$

$I'=\dfrac{1.0}{100}\times115$

$I'=1.15\ A$

Hence, The allowed current in the cable is 1.15 A.

4 0

3 years ago

Molly is jogging on the treadmill. After 20 minutes, her heart rate has not increased, she is able to talk, and she is not sweat

lakkis [162]

Molly could increase her heart rate by turning around and jogging backwards, by jogging on her hands instead of her feet, or by continuing to jog normally but increasing the speed of the treadmill.

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3 years ago

Read 2 more answers

8. A 60 kg runner has 1500 J of kinetic energy. How fast is he moving?

tresset_1 [31]

Answer: 7.07 m/s

Explanation:

Mass of runner = 60 kg runner

Kinetic energy = 1500J

Speed of runner = ?

Recall that kinetic energy is the energy possessed by a moving object, and it depends on its mass and speed by which it moves.

Hence, K.E = 1/2 x mass x (speed)^2

1500J = 1/2 x 60kg x (speed)^2

1500J = 30kg x (speed)^2

(speed)^2 = 1500J/30kg

(speed)^2 = 50

To get the value of speed, find the square root of 50

speed = √50

speed = 7.07 m/s

Thus, the runner moves as fast as 7.07 m/s

6 0

3 years ago