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3 years ago

HELP ASAP!!!!!!

Physics

2 answers:

Crazy boy [7]3 years ago

6 0

D. The objects have opposite charges

liberstina [14]3 years ago

3 0

Answer:

they have opposite charges

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A boy starts from point A and walks 3 meters toward the south, then turns around and walks 7 meters toward the north. What is th

jolli1 [7]

Answer:

-3m+7m = 4m

Explanation:

As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).

You subtract the final position from the initial position to get displacement.

7m - 3m = 4m

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3 years ago

Why can’t you feel the force of attraction between you and Mars?

laila [671]

We're millions of miles away from mars

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3 years ago

Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with

anastassius [24]

Answer:

2.11 m

Explanation:

Given data

h=6.626× $10^{-34\\}$ (plank constant)

L=45.7 pm

n=n2-n1

n=5-1

n=4

where,

n2=5

n1=1

To find:

E=?

λ=? (Wavelength)

solution

The energy stored in an electron at a specified level is given by;

E= $h^{2}$ × $n^{2}$ ÷8m $l^{2}$ ..........(1)

m=mass of electron(9.1× $10^{-31}$ )

l=length of box

To find E

putting the value of given data in eq(1)

E=9.41× $10^{-16}$

To find λ

λ=hc/E............................(2)

c=3× $10^{8}$ (speed of light)

putting the value in eq 2 to find wavelength

λ=2.11 m

Note:

There is a chance in calculation error. but the method is correct to solve the problem.

7 0

3 years ago

Read 2 more answers

A 15kg object strikes the ground with 2000J of kinetic energy after freely falling from rest. How far above the ground was the o

arsen [322]

Answer:

Explanation:

Find the final velocity at which it struck the ground by using the kinetic energy formula.

$KE=\frac{1}{2} mv^2$

$2000=\frac{1}{2} (15)v^2\\v=16.33$

Now use kinematics to solve for the vertical displacement. We were given the initial velocity and acceleration can be assumed to be 9.8

$V^2=V^2_i+2a(y_f-y_i)\\16.33^2=0^2+2(9.8)(y_f-y_i)$

Δy = 13.6 meters

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3 years ago

How many neutrons does element X have if its atomic number is 39 and its mass number is 79?

bazaltina [42]

Number of neutrons: atomic mass - atomic number

Element X's atomic mass is 79 and its atomic number is 39. Subtract 39 from 79 to find how many neutrons Element X has.

79 - 39 = 40

Element X has 40 neutrons.

6 0

3 years ago