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Mumz [18]
3 years ago
14

If points a and b are connected by a wire with negligible resistance, find the magnitude of the current in the 12.0 v battery.

Physics
1 answer:
Marizza181 [45]3 years ago
7 0
V = I * R
Where V is the voltage, I is the current and R is the resistance. Using Ohm's law, you require resistance to find the current through the wire. Technically, if the wire has a resistance of 0, you will get infinite current. But this isn't possible. Maybe the negligible resistance refers to the battery's internal resistance - not the wire's resistance. 
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Answer:

434.0 V/m

Explanation:

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while the radius of the beam is

r=\frac{5 mm}{2}=2.5 mm = 0.0025 m

so the cross-sectional area is

A=\pi r^2 = \pi (0.0025 m)^2=2.0\cdot 10^{-5} m^2

So the intensity of the laser beam is

I=\frac{P}{A}=\frac{0.005 W}{2.0\cdot 10^{-5} m^2}=250 W/m^2

The intensity of a laser beam is related to the magnitude of the electric field by

I=\frac{1}{2}c\epsilon_0 E^2

where

c is the speed of light

\epsilon_0 is the vacuum permittivity

Solving the formula for E, we find

E=\sqrt{\frac{2I}{c\epsilon_0}}=\sqrt{\frac{2(250 W/m^2)}{(3\cdot 10^8 m/s)(8.85\cdot 10^{-12} F/m)}}=434.0 V/m

4 0
3 years ago
A damped harmonic oscillator consists of a mass on a spring, with a small damping force that is proportional to the speed of the
exis [7]

Answer:

2.19 N/m

Explanation:

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Where T is the period, m is the mass (in kg), and K is the damping constant. So:

2.4 = 2π√(0.320/K)

√(0.320/K) = 2.4/2π

√(0.320/K) = 0.38197

(√(0.320/K))² = (0.38197)²

0.320/K = 0.1459

K = 2.19 N/m

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4 years ago
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Answer:

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Explanation:

I hope this helps, I got this from a website called Stack Exchange :)

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3 years ago
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Natali5045456 [20]
Newton's first law of motion. Because you fly over the handlebars and you land a few feet away on the ground. Your bike would stop immediately because of the unbalanced force.
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4 years ago
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german

Answer:

Less

Explanation:

Since acceleration is inversely propotional to mass keeping the force constant, hence more mass will accelerate less and vice versa.

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