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3 years ago

5

A unit for measuring frequency is the A. hertz. B. watt. C. ampere. D. ohm.

2 answers:

Ivahew [28]3 years ago

5 0

One hertz means that an event repeats one per second so the unit for measuring frequency is the hertz and the answer is A.hertz :)))
i hope this be helpful

baherus [9]3 years ago

3 0

The answer is A. Hertz. Frequency is the number of occurences of an event per unit of time. Hertz are commonly used to measure radio waves, which are frequencies, so the answer must be hertz.

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gavmur [86]

The average acceleration is 5/4 = 1.2m/s ^2

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4 years ago

A 25 kg child stands 2.5 m from the center of a frictionless merry‐go‐round, which has a 200 kg*m^2 moment of inertia and is spi

vodka [1.7K]

Answer:

Explanation:

a ) Time period T = 2 s

Angular velocity ω = 2π / T

= 2π / 2 = 3.14 rad /s

Initial moment of inertia I₁ = 200 + mr²

= 200 + 25 x 2.5²

=356.25

Final moment of inertia

I₂ = 200 + 25 X 1.5 X 1.5

= 256.25

b ) We apply law of conservation of momentum

I₁ X ω₁ = I₂ X ω₂

ω₂ = I₁ X ω₁ / I₂

Putting the values

$w_2=\frac{356.25\times3.14}{256.25}$

ω₂ = 4.365 rad s⁻¹

c ) Increase in rotational kinetic energy

=1/2 I₂ X ω₂² - 1/2 I₁ X ω₁²

.5 X 256.25 X 4.365² - .5 X 356.25 X 3.14²

= 684.95 J

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7 0

3 years ago

It is interesting to speculate on the properties of a universe with different values for the fundamental constants.

qwelly [4]

Answer:

Part a)

$\lambda = 0.345 m$

Part b)

$\Delta x = 0.274 m$

Part c)

$r = 2.8 \times 10^{11} m$

Explanation:

Part a)

De broglie wavelength is given as

$\lambda = \frac{h}{mv}$

$\lambda = \frac{1}{(0.145)(20)}$

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Part b)

By principle of uncertainty we know that

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Part c)

As we know that

$\frac{kq_1q_2}{r^2} = \frac{mv^2}{r}$

also we know

$mvr = \frac{nh}{2\pi}$

$v = \frac{h}{2\pi mr}$

now we have

$\frac{ke^2}{r} = \frac{mh^2}{4\pi^2m^2 r^2}$

$r = \frac{h^2}{4\pi^2mke^2}$

$r = 2.8 \times 10^{11} m$

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3 years ago

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Alja [10]

I know one is transformed, not sure about another

4 0

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wel

Answer:

D) 250 decibels

Explanation:

4 0

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