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4 years ago

What is the difference between a direct current and an alternating current?

2 answers:

4 0

<span>In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.</span>

faltersainse [42]4 years ago

4 0

Answer: alternating current regularly reverses direction. Direct current flows in only one direction

Explanation:

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Camping equipment weighting 5000N is pulled across a frozen lake by means of a horizontal rope. There is a frictional force of 3

Dmitry [639]

Answer:

The work done by the campers is $4\times10^{5}\ J$

(b) is correct option.

Explanation:

Given that,

Weight = 5000 N

Frictional force = 300 n

Distance = 1000 m

Constant rate of speed = 0.20 m/s²

We need to calculate the force

Using newton's law of motion

$F-F_{\mu}=ma$

$F-300=\dfrac{5000}{10}\times0.20$

$F=\dfrac{5000}{10}\times0.20+300$

$F=400\ N$

We need to calculate the work done

Using formula of work done

$W=F\times d$

Put the value into the formula

$W=400\times1000$

$W=4\times10^{5}\ J$

Hence, The work done by the campers is $4\times10^{5}\ J$

3 0

4 years ago

Which of the following types of electromagnetic radiation has the longest wavelength? choose one answer.

Setler79 [48]

The right answer is red light

8 0

3 years ago

A car is moving southwest at a velocity of 10 meters per second. Five seconds later, it's going 40 meters per second. What was t

Inga [223]

If "during this time" refers to the 5 second interval mentioned above, then the average acceleration is

$\bar a=\dfrac{v-v_0}{t-t_0}=\dfrac{40\,\frac{\mathrm m}{\mathrm s}-10\,\frac{\mathrm m}{\mathrm s}}{5\,\mathrm s-0\,\mathrm s}$

Notice that we took the start time to be the start of the 5 second interval and set that to $t_0=0$ . The starting velocity $v_0$ is the velocity measured at the start of the interval, and $v$ is the velocity measured at its end.

So the average velocity over these 5 seconds is

$\bar a=\dfrac{30\,\frac{\mathrm m}{\mathrm s}}{5\,\mathrm s}=6\,\dfrac{\mathrm m}{\mathrm s^2}$

6 0

4 years ago

Explain newton 2nd law ???<br><br>

shusha [124]

Explanation:

Newton's second law simply says that the net force on an object is equal to the object's mass times its acceleration.

∑F = ma

For example, think of a game of tug-of-war, in which two teams pull on a rope in opposite directions.

If the forces are equal (balanced), then the net force is 0 N, so Newton's second law tells us that the rope's acceleration is 0 m/s².

If the forces are not equal (unbalanced), then the net force is not 0 N, and the rope will accelerate in the direction of the net force.

7 0

4 years ago

Is a battery a resistor

-Dominant- [34]

A battery is a real-life voltage source. A battery can be thought of as a perfect voltage source with a small resistor (called internal resistance) in series. ... The terminal voltage equals the emf minus the voltage drop across the internal resistance (current of the external circuit times the internal resistance.)

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3 years ago