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soldier1979 [14.2K]
3 years ago
9

Brian is repairing an old alarm clock. He needs to replace a device that converts the electric energy into sound energy. Which o

f these devices should he use?
A.
battery
B.
buzzer
C.
motor
D.
switch
Physics
2 answers:
Dmitry [639]3 years ago
6 0
This would be the answer b which is buzzer
kkurt [141]3 years ago
3 0
Heyo, the answer would be buzzer (B)
think of how the buzzer makes a sound due to the electric energy
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Read 2 more answers
A 5.0-kg centrifuge takes 95 s to spin up from rest to its final angular speed with constant angular acceleration. A point locat
stellarik [79]

Answer:

(a) 17.37 rad/s^2

(b) 12479

Explanation:

t = 95 s, r = 6 cm = 0.06 m, v = 99 m/s, w0 = 0

w = v / r = 99 / 0.06 = 1650 rad/s

(a) Use first equation of motion for rotational motion

w = w0 + α t

1650 = 0 + α x 95

α = 17.37 rad/s^2

(b) Let θ be the angular displacement

Use third equation of motion for rotational motion

w^2 = w0^2 + 2 α θ

1650^2 = 0 + 2 x 17.37 x θ

θ = 78367.87 rad

number of revolutions, n = θ / 2 π

n = 78367.87 / ( 2 x 3.14)

n = 12478.9 ≈ 12479

4 0
3 years ago
1. . The maximum current output of a 60 Ω circuit is 11 A. What is the rms voltage of the circuit?
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a 1/4 watt resistor or a 20 watt amplifier.

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Where is the potential energy equal to zero?
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