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2 years ago

PLEASE HELP!!!!

Physics

1 answer:

Elena L [17]2 years ago

6 0

The emf power supply should be used for a 0.75 A recharging current is 2.25 V.

<h3>What is current?</h3>

The current is the stream of charges which flow inside the conductors when connected across the end of voltage.

Given is the battery having 1.5 V open circuit potential and internal resistance of 1 ohm.

From the Ohm's law, V =IR

R = V/I

Here, R is the proportionality constant.

To charge current I = 0.75 A

Voltage V = 0.75A x 1 ohm = 0.75 V

Total potential required is

= 1.5 +0.75

= 2.25 V

Thus, the emf power supply should be used for a 0.75 A recharging current is 2.25V.

Learn more about current.

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Concept Simulation 20.4 provides background for this problem and gives you the opportunity to verify your answer graphically. Ho

Evgesh-ka [11]

Answer: t = 0.492τ

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$q = q_0(1 - e^{\frac{t}{RC} })$

where:

$q_0$ is the equilibrium charge

q is the charge at time t

RC is time constant also called τ (tau)

For this problem, the circuit is charged to 39%, which means: q = $0.39 q_0$

$0.39q_0 = q_0 (1 - e^\frac{-t}{RC} )$

0.39 = 1 - $e^\frac{-t}{RC}$

$e^\frac{-t}{RC}$ = 0.61

$\frac{-t}{RC}$ = ln(0.61)

-t = ln(0.61)τ

t = 0.492τ

For the condition to be met it is needed 0.492 time constants must elapse.

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3 years ago

What social science, which deals with the behavior and thinking of organisms, differs from sociology primarily in that it focuse

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4 years ago

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Answer:

Summarized

Explanation:

Among the many hypotheses proposed for the origin of the moon the four main are summarized as

the fission hypotheses in which moon was once a part of earth but got separated due to collision. The second hypotheses is that the moon formed along with the Earth but independently.Moon was formed else where in the solar system and got captured by the Earth's gravitational pull. The newer giant impact hypotheses suggest that a mars sized object grazed Earth, Ejecting material from both Earth and itself, that material condensed to form moon.

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3 years ago

A man is trying to push a 250 N dresser across his carpeted bedroom. He applies a force of 20 N and the carpet provides a fricti

11111nata11111 [884]

Answer:

The correct option is;

B. Subtract vectors A from C; $F_{Net}$ = 12 N

Explanation:

The given parameters are;

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The frictional force provided by the carpet = 8 N = The component of the weight resisting motion = A

Therefore, the net force tending to put the dresser in motion, $F_{Net}$ , is given as follows;

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