3 years ago

How long does it take the baton to complete one spin?

1 answer:

7 0

The centripetal acceleration is given by:
a = 4π²R/T²

Using this formula,
47.82T² = 4π² x (0.76/2)
T = 0.56 s

The answer is B.

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Do you think energy can be “used up?” Why or why not?

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I dint think energy can be used up because energy cant be created nor destroyed

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3 years ago

A magnetic field is aligned perpendicular to the plane of a circular loop of wire with radius 5.0 cm and 20 turns. The magnetic

Mariana [72]

Answer:

$V = 0.157(-36 e^{-3t} + 1.5)$

$t = 1.24 s$

Part b)

$EMF = 0.136(-36e^{-3t} + 1.5)$

Explanation:

magnetic field due to external source is given as

$B = 12 e^{-3t} + 1.5 t + 6$

area of the loop is given as

$A = \pi r^2$

$A = \pi(0.05)^2$

$A = 7.85 \times 10^{-3} m^2$

Now we have

$\phi = NBAcos0$

$\phi = (20)(12e^{-3t} + 1.5t + 6)(7.85 \times 10^{-3})$

$V = \frac{d\phi}{dt}$

$V = 0.157\frac{d}{dt}(12e^{-3t} + 1.5t + 6)$

$V = 0.157(-36 e^{-3t} + 1.5)$

now we need to find the time at which voltage is 0.1 Volts so we have

$0.1 V = 0.157(-36e^{-3t} + 1.5)$

$t = 1.24 s$

Part b)

If magnetic field is inclined at an angle of 30 degree with the normal of the loop then

$\phi = NBAcos30$

now we know that induced EMF is given as

$EMF = \frac{d\phi}{dt}$

$EMF = NAcos30\frac{dB}{dt}$

$EMF = (20)(7.85 \times 10^{-3})cos30(\frac{d}{dt}(12e^{-3t} + 1.5t + 6))$

$EMF = 0.136(-36e^{-3t} + 1.5)$

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3 years ago

Two Atoms are isotopes of each other if they have the same number of_______ but a different number _________.

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The correct answer is #4. They have the same number of protons but a different number of neutrons.

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A 4.0-ω resistor, an 8.0-ω resistor, and a 10.0-ω resistor are connected in series across an 11-V battery. The total potential d

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Total potential difference is 6

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What is the change in the cell voltage when the ion concentrations in the cathode half-cell are increased by a factor of 10?

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4 years ago

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