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3 years ago

9

Victoria has a crate of vegetables that weighs 100 newtons. She exerts a force of 100 newtons to lift the crate with a pulley. W

hat’s the mechanical advantage in this situation?

2 answers:

kirza4 [7]3 years ago

7 0

The MA would be 1 as effort = load here and MA= load/effort

tino4ka555 [31]3 years ago

3 0

it would be equal to 1

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lightning strikes in the distance and six seconds later Thunder is heard how far away was the lightning strike

marshall27 [118]

The speed of sound really depends on the temperature and moisture in the air,
and the sound of the thunder doesn't necessarily travel straight from the lightning
to where you are. So we can't say exactly.

But if we use the nominal speed of 340 m/s, then 6 seconds means 2,040 meters,
or about 6,700 feet, or about 1.27 miles.

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3 years ago

At the Sun Dagger in New Mexico, a dagger-shaped beam of sunlight pierces a spiral

nadya68 [22]

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You are working with a 3 T MRI scanner with maximum gradient strength of 40 mT/m in all 3 axes (x,y,z). Your acquisition uses ma

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2 years ago

Find (a) the amplitude, (b) the wavelength, (c) the period, and (d) the speed of a wave whose displacement is given by y= 1.6 co

Nastasia [14]

The expression for the equation of a wave is:
$y(x,t)= A \cos (kx + \omega t)$ (1)
where
A is the amplitude
$k= \frac{2 \pi}{ \lambda }$ is the wave number, with $\lambda$ being the wavelength
x is the displacement
$\omega= \frac{2 \pi}{T}$ is the angular frequency, with T being the period
t is the time

The equation of the wave in our problem is
$y(x,t)= 1.6 \cos (0.71 x + 36 t)$ (2)
where x and y are in cm and t is in seconds.

a) Amplitude:
if we compare (1) and (2), we immediately see that the amplitude of the wave is the factor before the cosine:
A=1.6 cm

b) Wavelength:
we can find the wavelength starting from the wave number. For the wave of the problem,
$k= \frac{2 \pi}{\lambda}=0.71 cm^{-1}$
And re-arranging this relationship we find $\lambda= \frac{2 \pi}{k}= \frac{2 \pi}{0.71 cm^{-1}}=8.8 cm$

c) Period:
we can find the period by using the angular frequency:
$\omega= \frac{2 \pi}{T}= 36 s^{-1}$
By re-arranging this relationship, we find
$T= \frac{2 \pi}{\omega}= \frac{2 \pi}{36 s^{-1}}=0.17 s$

d) Speed of the wave:
The speed of a wave is given by
$v= \lambda f$
where f is the frequency of the wave, which is the reciprocal of the period:
$f= \frac{1}{T}= \frac{1}{0.17 s}=5.9 s^{-1}$
And so the speed of the wave is
$v= \lambda f=(8.8 cm)(5.9 s^{-1})=52 cm/s$

e) Direction of the wave:
A wave written in the cosine form as
$y(x,t)=A \cos(\omega t- kx)$
propagates in the positive x-direction, while a wave written in the form
$y(x,t)=A \cos(\omega t+ kx)$
propagates in the negative x-direction. By looking at (2), we see we are in the second case, so our wave propagates in the negative x-direction.

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3 years ago

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sashaice [31]

Answer:

Nuclear is the answer because it is the brain of the cell

5 0

3 years ago

Read 2 more answers