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3 years ago

15

Ac soucre change it polarity how many time

1 answer:

Karolina [17]3 years ago

6 0

Alternating current (AC) flows half the time in one direction and half the time in the other, changing its polarity 120 times per second with 60-hertz current.

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Degrees of loudness and softness in music are called.

andrey2020 [161]

Degrees of loudness and softness in music are called dynamics. I don’t really have an explanation for this, that’s just what they’re called. I know because I’m a violinist and learned it when I first started playing.

7 0

3 years ago

What is the acceleration of a 150 kg object pushed with a force of 1000 N?

kirill115 [55]

Answer:

<h2>6.67 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = \frac{f}{m} \\$

f is the force

m is the mass

From the question we have

$a = \frac{1000}{150} \\ = 6.66666..$

We have the final answer as

<h3>6.67 m/s²</h3>

Hope this helps you

8 0

3 years ago

As a stunt for movie two cars are to collide with each other head on. The two cars are initially 125 apart. Car A is heading str

Tema [17]

Answer:

3.39724 seconds

23.0824792352 m, 101.917520765 m

13.58896 m/s

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

The equation of motion will be

$s=ut+\dfrac{1}{2}at^2\\\Rightarrow 125=30\times t+\dfrac{1}{2}\times 4\times t^2\\\Rightarrow 2t^2+30t-125=0\ m$

$t=\frac{5\left(\sqrt{19}-3\right)}{2},\:t=-\frac{5\left(3+\sqrt{19}\right)}{2}\\\Rightarrow t=3.39724, -18.39724$

The time at which the cars collide is 3.39724 seconds

$s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=0\times t+\dfrac{1}{2}\times 4\times 3.39724^2\\\Rightarrow s=23.0824792352\ m$

Car B traveled 23.0824792352 m and Car A traveled 125-23.0824792352 = 101.917520765 m

$v=u+at\\\Rightarrow v=0+4\times 3.39724\\\Rightarrow v=13.58896\ m/s$

The speed of car B is 13.58896 m/s

4 0

3 years ago

What happens to the velocity of an object when balanced forces act on it

mixas84 [53]

Nothing happens to velocity at all. Speed and direction remain constant.

6 0

3 years ago

An ultrasound pulse used in medical imaging has a frequency of 5 MHz and a pulse width of 0.5 us. Ap- proximately how many osci

podryga [215]

At the frequency of 5 MHz, the period of the oscillations is 1/5meg. That's a period of 1/5 microsecond.

There are 5 full cycles in one full microsecond, and there are 2.5 full cycles in a 0.5 us pulse.

You'll have to decide for yourself how damped a pulse of 2.5 cycles is, because the parameters of the definition are corrupted in the question.

4 0

3 years ago