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3 years ago

As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor:_______.

Physics

1 answer:

Akimi4 [234]3 years ago

5 0

Answer:

b. approaches infinity

Explanation:

Because Capacitive reactance is given as Xc = 1/ωC

So we can see that the value of capacitive reactance and therefore its overall impedance (in Ohms) decreases to zero as the frequency increases acting like a short circuit.

Same as the frequency approaches zero or DC, the capacitors reactance increases to infinity, acting like an open circuit which is why capacitors block DC

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A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope w

leonid [27]

Answer:

The pulling force that the man should apply to create an upward acceleration of $1.20m/s^{2}$ is $P=621.5N$

Explanation:

As it shows in the drawing at the end, we have that the total mass of the man plus the platform is $113 kg$ , then the force downward $W$ is $W=mg=113Kg*9.8m/s^{2}=1107.4N$ .

Due the man needs to do a pulling force upward capable of lifting himself and the platform with an acceleration of $1.20m/s^{2}$ , this force should create an acceleration greater than gravity by $1.20m/s^{2}$ . then $a_{up}=g+1.2m/s^{2}=9.8m/s^{2}+1.2m/s^{2}=11m/s^{2}$ . Therefore the force should be $P_{up}=ma_{up}=113kg*11m/s^{2}=1243N$ .

Finally, as we have a pulley arrangement connected to the platform, it gives the man a mechanical advantage, so he has to do only half of that upward force

, therefore $P=\frac{1243N}{2}=621.5N$ .

8 0

3 years ago

Which form of the law of conservation of energy describes the motion of the block when it slides from the top of the table to th

Mnenie [13.5K]

By definition we have that the energy at the top of the ramp is equal to the energy at the bottom of the ramp. This is due to the principle of energy conservation.

We have then:

$E1 = E2$

The energy at the top is only potential energy:

$E1 = mgh$

Where,

m: mass
g: acceleration of gravity
h: vertical height of the ramp

The energy when it falls is transformed into kinetic energy and therefore:

$E2 = \frac {1} {2} mv ^ 2$

Where,

v: object speed.

Therefore we have:

$mgh = \frac {1} {2} mv ^ 2$

Answer:

The potential energy is transformed into kinetic energy.

$mgh = \frac {1} {2} mv ^ 2$

3 0

3 years ago

A satellite is in a circular orbit around the Earth at an altitude of 3.18x10 m. Find the period and th orbital speed of the sat

Leona [35]

Answer:

112.17 m/s

56.427 years

Explanation:

h = 3.18 x 10^10 m

R = 6.4 x 10^6 m

r = R + h = 3.18064 x 10^10 m

M = 6 x 10^24 kg

The formula for the orbital velocity is given by

$v = \sqrt{\frac{G M }{r}}$

$v = \sqrt{\frac{6.67 \times 10^{-11}\times 6\times 10^{24} }{3.18064\times 10^{10}}}$

v = 112.17 m/s

Orbital period, T = 2 x 3.14 x 3.18064 x 10^10 / 112.17

T = 0.178 x 10^10 s

T = 56.427 years

8 0

3 years ago

A red light means to stop. If you are turning from a two-way road or onto a two-way road, then you are NOT allowed to turn

lyudmila [28]

A red light means to stop. If you are turning from a two-way road or onto a two-way road, then you are NOT allowed to reverse your car If you can't do it

Red is typically used to indicate danger or warning, and on traffic lights, it indicates a potential hazard ahead and, as a result, serves as a signal for drivers to stop. If the traffic light turns red while you are already at a junction, you must move swiftly to the opposite side to avoid a potential accident with oncoming traffic.
If the traffic light has turned red as you approach the junction and you are just entering it, you must stop. Unless there is a sign clearly telling you not to turn left at the red light, you may do so. Give way to people and cars coming from other directions when turning.

To learn more about Traffic lights please visit -
brainly.com/question/14871009
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7 0

2 years ago

Read 2 more answers

What do active solar heat systems have that passive systems do not have?.

tamaranim1 [39]

Answer:

Passive solar heating uses building design to utilize sunlight, while active solar heating uses technology.

Explanation:

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2 years ago