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N76 [4]
3 years ago
11

Elements have the same number of __as you move from left to right

Physics
1 answer:
Maksim231197 [3]3 years ago
6 0

Answer:

Explanation:

They have the same number of shells/ or energy levels!

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A student pulls on a rope attached to a box of books and moves the box down the hall. The student pulls with a force of 185N at
Vitek1552 [10]

Answer:

2.75 m/s^2

Explanation:

We can solve the problem by writing the equations of motion along the horizontal and vertical direction.

Along the horizontal direction we have:

T cos \theta - \mu N = ma (1)

where

T cos \theta is the horizontal component of the tension, where

T = 185 N is the tension in the rope

\theta=25^{\circ} is the angle between the rope and the horizontal

\mu N is the force of friction, where

\mu=0.27 is the coefficient of friction

N is the normal reaction of the floor on the box

m = 35.0 kg is the mass of the box

a is the acceleration

Along the vertical direction we have:

N+T sin \theta-mg=0 (2)

where

N is the normal force (upward direction)

T sin \theta is the vertical  component of the tension in the rope (upward direction)

mg is the weight of the box (downward direction), where

m = 35.0 kg is the mass of the box

g=9.8 m/s^2 is the acceleration due to gravity

From eq.(2) we get:

N=mg-T sin \theta

And substituting into (1), we can find the acceleration:

T cos \theta - \mu (mg-T sin \theta) = ma\\Tcos \theta -\mu mg + \mu T sin \theta = ma\\a=\frac{T cos \theta- \mu mg + \mu T sin \theta}{m}=\\=\frac{(185)(cos 25^{\circ})-(0.27)(35.0)(9.8)+(0.27)(185)(sin 25^{\circ})}{35.0}=2.75 m/s^2

8 0
3 years ago
Help help hep help???????????
Sergeu [11.5K]

Momentum

mava + mbvb = mava '+ mbvb'

(300 x 10)+(150 x 0) = (300 x 4.12)+(150 x vb')

3000=1236+150vb'

1764 = 150vb'

vb'=+11.76 m/s ≈ +11.8 m/s (positive sign, to the right)

3 0
2 years ago
Unpolarized light with intensity 370 W/m2 passes first through a polarizing filter with its axis vertical, then through a second
vampirchik [111]

To solve this problem it is necessary to apply the concepts given by Malus regarding the Intensity of light.

From the law of Malus intensity can be defined as

I' = \frac{I_0}{2} cos^2 \theta

Where

\theta =Angle From vertical of the axis of the polarizing filter

I_0 = Intensity of the unpolarized light

The expression for the intensity of the light after passing through the first filter is given by

I = \frac{I_0}{2}

Replacing we have that

I = \frac{370}{2}

I = 185W/m^2

Re-arrange the equation,

I'= \frac{I_0}{2}cos^2\theta

Re-arrange to find \theta

cos^2\theta = \frac{2I'}{I_0}

cos^2\theta = \frac{2*138}{370}

\theta = cos^{-1}(\sqrt{\frac{2*138}{370}})

\theta = 0.5282rad

\theta = 30.27\°

The value of the angle from vertical of the axis of the second polarizing filter is equal to 30.2°

4 0
3 years ago
Help me with this speed thingy I don't have no idea
Aneli [31]
He goes 24 miles. hope this helps!
7 0
3 years ago
Read 2 more answers
Which statement about the effects of medium on the speed of a mechanical wave is true?
Anastasy [175]

C. A mechanical wave generally travels faster in gases than liquids.

7 0
3 years ago
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