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3 years ago

6

For most all atoms, compared with the atomic number, the atomic mass is

2 answers:

belka [17]3 years ago

7 0

The atomic mass is GREATER than the atomic number, for all atoms except Hydrogen.

BartSMP [9]3 years ago

6 0

Is the weighted average mass of an atom of an element based on the relative of natural abundance of that isoptopes of elements.

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A 50n brick is suspended by a light string from a 30kg pulley which may be considered a solid disk with radius 2.0m. the brick i

igomit [66]

Brick is held at a position which is at height 2 m from the floor

Now it is released from rest and hit the floor after t = 4 s

Now the acceleration of the brick is given by

$y = v_i* t + 0.5 at^2$

$2 = 0 + 0.5 * a * 4^2$

$a = 0.25 m/s^2$

a)

Now in order to find the tension in the string

we can use Newton's law

$F_{net} = ma$

$mg - T = ma$

$50 - T = \frac{50}{9.8}*0.25$

$T = 48.72 N$

part b)

Now for the pulley

moment of inertia= $\frac{1}{2}mr^2$

m = 30 kg

R = 2 m

I = $\frac{1}{2}*30*2^2$

I = 60 kg m^2

Now the angular speed just before brick collide with the floor

$w = \frac{v}{r}[\tex]here we have[tex]v = v_i + a* t$

$v = 0 + 0.25 * 4$

v = 1 m/s

Now we will have

L = angular momentum = I w = $I*\frac{v}{R}$

L = 60 * $\frac{1}{2}$

L = 30 kg m^2/s

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3 years ago

The velocity of a proton emerging from a Van de Graaff accelerator is 25.0% of the speed of light. What was the equivalent volta

LenaWriter [7]

Explanation:

Below is an attachment containing the solution.

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4 years ago

A device for acclimating military pilots to the high accelerations they must experience consists of a horizontal beam that rotat

Natali [406]

centripetal acceleration is given by formula

$a_c = \omega^2*R$

given that

$a_c = 34.1 m/s^2$

$R = 5.91 m$

now we have

$\omega^2 R = 34.1$

$\omega^2 * 5.91 = 34.1$

$\omega^2 = 5.77$

$\omega = 2.4 rad/s$

so the ratationa frequency is given by

$\omega = 2 \pi f$

$2.4 = 2 \pi f$

$f = \frac{2.4}{2\pi}$

$f = 0.38 Hz$

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3 years ago

Pls help me I will make you as Brainly

Helga [31]

Answer:

D

Explanation:

6 0

3 years ago

Read 2 more answers

Your friend has slipped and fallen. To help her up, you pull with a force F, as the drawing shows. The vertical component of thi

sineoko [7]

This question can be solved using the concept of the composition of the vector.

(a) The magnitude of F is b "164.27 N".

(b) The angle of the vector from horizontal is " ".

(a)

From the composition of the rectangular components of a vector, we know that the magnitude of the resultant vector is given by the following formula:

$F = \sqrt{F_x^2+F_y^2}$

where,

$F_x$ = x-component of the force = 122 N

$F_y$ = y-component of the force = 110 N

Therefore,

$F = \sqrt{(122\ N)^2+(110\ N)^2}$

<u>F = 164.27 N</u>

(b)

The angle of the vector is given by the following formula:

$\theta = tan^{-1}(\frac{F_y}{F_x})\\\\\theta = tan^{-1}(\frac{110\ N}{122\ N})\\\\$

<u>θ = 42.04°</u>

Learn more about the composition of vector here:

brainly.com/question/24313520?referrer=searchResults

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3 years ago