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3 years ago

1. Jennifer wants to pick up a heavy box. The box weighs 22

Physics

1 answer:

dolphi86 [110]3 years ago

3 0

Answer:

97.9 Newtons

Explanation:

It take 4.45 newtons to lift 1 pound, so 4.45 * 22 = 97.9

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At rest, a car’s horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist movin

coldgirl [10]

Answer:

(a): The cyclist is behind the car.

(b): The speed of the car are Vf= 31.97 m/s.

Explanation:

f= 440 Hz

f'= 415 Hz

Vo= 1/3 Vf

Vf= ?

V= 343.2 m/s

f'= f* ( (V-(-Vo) / (V-(-Vf) )

clearing Vf :

Vf= 31.97 m/s

Vo= 10.65 m/s

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4 years ago

In an electromagnet, a moving charge creates which of the following?

klasskru [66]

The correct answer is A. a magnetic field

This basically means that the field behaves like a magnet as long as the charge exists. If the charge is stopped, then it loses it's magnetic properties because the field doesn't exist anymore.

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3 years ago

If a proton and an electron are released when they are 4.00 x 10^-10 m apart, find the initial acceleration of each of them.

SVEN [57.7K]

Answer:

For proton

$a=8.8\times 10^{17}\ m/s^2$

For electron

$a=1.5\times 10^{21}\ m/s^2$

Explanation:

We know that

The mass of electron

$m=9.1\times 10^{-31}\ kg$

The mass of proton

$m=1.67\times 10^{-27}\ kg$

Charge on electron and proton

q₁=q₂=q

$q=1.6\times 10^{-19}\ C$

Electrostatics force

$F=K\dfrac{q_1q_2}{r^2}$

Now by putting the values

$F=9\times 10^9\times \dfrac{1.6\times 10^{-19}\times 1.6\times 10^{-19}}{(4\times 10^{-10})^2}$

$F=1.44\times 10^{-9}\ N$

For proton

F = m a

a =F/m

$a=\dfrac{1.4\times 10^{-9}}{1.67\times 10^{-27}}\ m/s^2$

$a=8.8\times 10^{17}\ m/s^2$

For electron

$a=\dfrac{1.4\times 10^{-9}}{9.1\times 10^{-31}}\ m/s^2$

$a=1.5\times 10^{21}\ m/s^2$

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3 years ago

Read 2 more answers

What should a model of the rock cycle show as the process that changes metamorphic rock to igneous rock?

Ratling [72]

Answer:

Rock cycle describes the concept in geology that shows the changes in the rock type in the geologic time.

Many processes undergoes in the rock cycle that leads to transition of rocks, the process that changes metamorphic rock to igneous rock is melting and crystallization. The metamorphic rock melts under high pressure and temperature and which crystallizes into a completely different kind of rock, called igneous rock.

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3 years ago

How can wasted energy be made useful?

murzikaleks [220]

Answer:

by using it in a such place or thing which needs it or which can work with it

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2 years ago