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4 years ago

In RC circuit, long after switch is closed current through the capacitor will be

Physics

1 answer:

mario62 [17]4 years ago

4 0

Answer:

C. Zero.

Explanation:

A Resistor and Capacitor combination is called an RC circuit.

When the switch is closed, the charge on the capacitor starts to increase. This continues until the voltage across it becomes the supply voltage provided by the battery. (EMF of the battery). Current is maximum.

As charge builds up on the capacitor, current will slow down. Once the capacitor is fully charged, no more current flows in the circuit, since the capacitor behaves as an open circuit.

The voltage increase provided by the battery is equal tot he voltage drop across the capacitor . At this point, the voltage drop across the resistor is zero and hence No Current flows.

As time increases, the current across it decreases exponentially according to the equation I (t) = I(0) e ⁻ t / τ .

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A crane lifts a 1,750 kg mass using a steel cable whose mass per unit length is 0.88 kg/m. What is the speed of transverse waves

Sauron [17]

Answer:

139.6m/s

Explanation:

Calculate the tension first, T=m*g

mass(m): 1750kg, gravity(g): 9.8m/s^2

T= 1750*9.8

=17150N

Then calculate the wave speed using the equation v = √ (T/μ)

v= √(17150N)/(0.88kg/m)

=139.6m/s

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3 years ago

A child is riding a merry-go-round, which has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745

Elena L [17]

w = instantaneous angular speed = 1.25 rad/s

r = radius = 4.65 m

α = angular acceleration = 0.745 rad/s²

centripetal acceleration is given as

$a_{c}$ = rw²

$a_{c}$ = (4.65 ) (1.25)² = 7.27 m/s²

tangential acceleration is given as

$a_{t}$ = rα

$a_{t}$ =4.65 x 0.745 = 3.46 m/s²

angle is given as

$\theta = tan^{-1}(\frac{a_{c}}{a_{t}})$

$\theta = tan^{-1}(\frac{7.27}{3.46})$

$\theta$ = 64.5 deg

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4 years ago

Friction between solids can be most accurately defined as the force that

ki77a [65]

Answer:

True

Explanation:

Friction between solids can be most accurately defined as the force that

opposes the sliding motion of two surfaces that are touching each other.

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3 years ago

How does increasing the<br> speed of an object change its<br> momentum?

aleksley [76]

Answer:

When you increase speed, you add energy and increase momentum as it would require more energy to change, stop or reverse the object's direction of travel than before the speed increase. Increasing the speed increases the momentum proportionally.

Explanation:

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4 years ago

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What property do the following elements have in common? Li, C, and F A) They are poor conductors of electricity. B) Each element

Aloiza [94]

Answer: Option (D) is the correct answer.

Explanation:

The given elements Li, C and F are all second period elements. So, when we move from left to right across a period then there occurs increase in number of valence electrons as there occurs increase in total number of electrons.

So, it means more electrons are added to the same energy level.

Thus, we can conclude that a property of valence electrons for each element is located in the same energy level is common in the given elements.

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3 years ago

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