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soldier1979 [14.2K]

2 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

2 answers:

Dmitry [639]2 years ago

6 0

This would be the answer b which is buzzer

kkurt [141]2 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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An electron in a vacuum is first accelerated by a voltage of 51400 V and then enters a region in which there is a uniform magnet

zimovet [89]

Answer:

F = 8.6 10⁻¹² N

Explanation:

For this exercise we use the law of conservation of energy

Initial. Field energy with the electron at rest

Em₀ = U = q ΔV

Final. Electron with velocity, just out of the electric field

Emf = K = ½ m v²

Em₀ = Emf

e ΔV = ½ m v²

v =√ 2 e ΔV / m

v = √(2 1.6 10⁻¹⁹ 51400 / 9.1 10⁻³¹)

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v = 1,344 10⁸ m / s

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For this exercise we use the law of conservation of energy

Initial. Field energy with the electron at rest

Emo = U = q DV

Final. Electron with velocity, just out of the electric field

Emf = K = ½ m v2

Emo = Emf

.e DV = ½ m v2

.v = RA 2 e DV / m

.v = RA (2 1.6 10-19 51400 / 9.1 10-31)

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5 0

2 years ago

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Using elimination, the answer is C.

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3 years ago

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Answer:

The correct option is A)

Displacement: 6.71 m, Direction: 63.4 degrees north of east

Explanation:

Given that Dante is leading a parade across the main street in front of city hall.

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One block of city is one units on the XY- graph

Statement 1: Parade marches the parade 4 blocks east, then 3 blocks south

New location of parade is 4i-3j

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Final location of parade is (4i-3j)+(-1i+9j)=3i+6j

Displacement is given by

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Thus,

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Therefore, the correct option is A) Displacement: 6.71 m, Direction: 63.4 degrees north of east

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3 years ago

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Answer:

i think its C hope this is rhight have a good day

Explanation:

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2 years ago

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