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3 years ago

Question 8 (1 point) How many protons are in an element with an atomic number of 8 and a mass number of 18? a 3 b 8 c 10 d 18

Physics

1 answer:

yarga [219]3 years ago

6 0

Answer: B - 8

Explanation: 8 protons because number of protons is equal to number of atoms in the nucleus.

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8 m N & 5 m 30° N of E<br><br> Draw and add the vectors.

Contact [7]

by vector addition.

< 5 m, 270 degrees> + < 8 cm, 90 degrees>

=< 500 cos 270, 500 sin 270 > + < 8 cos 90, 8 sin 90 >

=< 0, −500 > + < 0, −8 >

=< 0, −492 > cm

The so-called parallelogram law lays forth the guidelines for adding two or more vectors together. By aligning the two vectors A and B head to tail and drawing the vector from the free tail to the free head, the vector sum A+B is created. If A=(a 1,a 2,...,a n) and B=(b 1,b 2,...,b n), then vector addition can be done in Cartesian coordinates by adding the respective components of the vectors.

A+B=(a 1+b 1,a 2+b 2,...,a n+b n).

The Wolfram Language uses a plus symbol to denote vector addition, as in a1, a2,..., an+b1, b2,..., bn

to learn more about vector:

brainly.com/question/13322477

#SPJ4

3 0

2 years ago

A potter's wheel is rotating around a vertical axis through its center at a frequency of 2.0 rev/s. The wheel can be considered

mart [117]

Answer:

$\omega_f=12.2954 \,rad.s^{-1}$ i.e.

$Frequency=1.9569\,rev.s^{-1}$

Explanation:

Given:

angular speed, $\omega_i =2\times 2\pi \,rad.s^{-1}$

mass of the disk, $M=4.9\,kg$

radius of the disk, $R=0.2\,m$

mass of the chunk, $m=2.7\,kg$

radius of the chunk, $r=0.04\,m$

We know that the angular momentum is given by:

$L=I.\omega$

and moment of inertia for a disc:

$I=\frac{1}{2} m.r^2$

According to the conservation of angular momentum, the final angular momentum is equal to the initial angular momentum.

$\frac{1}{2} \times M.R^2\times \omega= \frac{1}{2} \times (M.R^2+m.r^2) \omega_f$

$4.9\times 0.2^2\times (2\times 2\pi)=(4.9\times 0.2^2+2.7\times 0.04^2 )\tiems \omega_f$

$\omega_f=12.2954 \,rad.s^{-1}$

$Frequency=1.9569\,rev.s^{-1}$

4 0

4 years ago

Sound travels at a rate of 340 m/s in all directions through air. Matt rings a very loud bell at one location, and Steve hears i

Mice21 [21]

It took 450/340 = 1.32 seconds

5 0

4 years ago

1. Which of the following best describes the movement of an object at rest if no outside forces act on it?

Mariulka [41]

C.It will stay at rest due to inertia

8 0

3 years ago

Read 2 more answers

How do u convert 7.68 cal/sec to kcal/min

stich3 [128]

<span>First you have to convert 7.68 cal/sec to cal/min to do that, just multiply by 60 So it will be 460.8 cal/min now convert that to kcal/min kcal = kilocalories = 1000 calories. so just divide by 1000 and youll have your answer in kcal/min </span>

5 0

4 years ago

Read 2 more answers