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coldgirl [10]
4 years ago
11

In a circuit, a variable resistor is to be connected across a potential difference of 60 volts to allow the current to be adjust

ed in the range from 40 milliamperes to 100 milliamperes.
A variable resistor is a device in which the resistance can be varied.
mA = milliamperes, or 10-3 amperes
Over what range must the resistance vary?

plz help :')
Physics
1 answer:
sweet [91]4 years ago
4 0

Answer:

600 and 1500 [ohm

Explanation:

To solve this problem we must use ohm's law, which tells us that the voltage is the product of the current by the resistance, so we have:

V = I*R

where:

V = voltage [V]

I = current [amp]

R = resistance [ohm]

<u>Therefore:</u>

R = V/I

R1 = 60/(40*10^-3) = 1500 [ohm]

R2 = 60/(100*10^-3) = 600 [ohm]

So the resistance should be among 600 and 1500 [ohm]

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Suppose the acceleration of an elevator is 1/2 g upward, then what is the reading on the scale in the elevator.
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Answer:

c. 3/2 mg

Explanation:

Given that the acceleration of an elevator is 1/2 g upward.

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3 years ago
The rotational kinetic energy term is often called the kinetic energy in the center of mass, while the translational kinetic ene
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Question in proper order

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You found that the total kinetic energy is the sum of the kinetic energy in the center of mass plus the kinetic energy of the center of mass. A similar decomposition exists for angular and linear momentum. There are also related decompositions that work for systems of masses, not just rigid bodies like a dumbbell.  

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Option c

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