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My name is Ann [436]

3 years ago

8

you work for a moving company and have to pick up some furniture. you quickly find out that chairs made from solid wood are much

harder to pick up than plastic chairs. why is this?

1 answer:

Brilliant_brown [7]3 years ago

8 0

I think it would be because solid wood is a lot heavier than plastic

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What is the magnification of a real image if the image is 15.0 cm from a lens and the object is 60.0 cm from the lens?

Hoochie [10]

Answer:

soluble

Explanation:

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3 years ago

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A negative charge -0.550 HC exerts an upward 0.700 N force on an unknown charge 0.220 m directly below it. (a) What is the unkno

Sonja [21]

Answer:

Part a)

$q_2 = -6.8 \mu C$

Part b)

$F = 0.700 N$

direction = downwards

Explanation:

As we know that the negative charge will experience the force due to some other charge below it

the force is given as

$F = 0.700 N$

now we know that

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

now plug in all data

$0.700 = \frac{(9 \times 10^9)(0.550\mu C)q_2}{0.220^2}$

$0.700 = 1.022\times 10^5 q_2$

$q_2 = -6.8 \mu C$

since this is a repulsion force so it must be a negative charge

Part b)

As per Newton's III law it will exert equal and opposite force on it

So here the force on the charge below it will be same in magnitude but opposite in direction

so here we have

$F = 0.700 N$

direction = downwards

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3 years ago

A team of engineers is measuring the strength of a new material. They have measure the strength to be 112,000 Pa. if the enginee

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Answer:

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2 years ago

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/10 the speed of light? __

Softa [21]

Answer: $2.42(10)^{-11} m$

Explanation:

The de Broglie wavelength $\lambda$ is given by the following formula:

$\lambda=\frac{h}{p}$ (1)

Where:

$h=6.626(10)^{-34}\frac{m^{2}kg}{s}$ is the Planck constant

$p$ is the momentum of the atom, which is given by:

$p=m_{e}v_{e}$ (2)

Where:

$m_{e}=9.11(10)^{-31}kg$ is the mass of the electron

$v=\frac{1}{10}c$ is the velocity of the electron (we are told it is 1/10 the speed of light $c=3(10)^{8}\frac{m}{s}$ )

This means equation (2) can be written as:

$p=m_{e}\frac{1}{10}c$ (3)

Substituting (3) in (1):

$\lambda=\frac{h}{m_{e}\frac{1}{10}c}$ (4)

$\lambda=10\frac{h}{m_{e} c}$ (5)

Now, we only have to find $\lambda$ :

$\lambda=10\frac{6.626(10)^{-34}\frac{m^{2}kg}{s}}{(9.11(10)^{-31}kg)(3(10)^{8}\frac{m}{s})}$ (6)

<u>Finally:</u>

$\lambda=2.42(10)^{-11} m$ >>> This is the de Broglie wavelength of an electron.

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4 years ago

An arrow in flight has an initial velocity of 65 meters per second, and 10 seconds later, it has a velocity of 35 meters per sec

Sergeu [11.5K]

To find the acceleration, we would need to use the equation acceleration= final velocity- initial velocity/elapsed time. Since the final velocity is 35 and the initial velocity is 65, we can subtract 65 from 35 first, which gives us -30. Then if we divide that by the elapsed time, which is 10, we get -3. Your acceleration is -3 meters per second.

Hope this helps! :D

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3 years ago