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bezimeni [28]
3 years ago
6

1. A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is

Physics
1 answer:
Flauer [41]3 years ago
5 0

Answer:

41

Explanation:

An atom that contains 20 protons, 21 neutrons, and 20 electrons has an atomic mass of 41.

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Why we have leap year?
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Answer:February 29 is a date that usually occurs every four years, and is called leap day. This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit the sun in precisely 365 days.

Explanation: brainlest plz

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What is the speed of electromagnetic radiation in free speed
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Read 2 more answers
a 15kg television sits on a shelf at a height of 0.3 m how much gravitational potential energy is added to the television when i
DedPeter [7]

Answer:

<h2>103 Joules</h2>

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules

7 0
3 years ago
An object moving due to gravity can be described by the motion equation y=y0+v0t−12gt2, where t is time, y is the height at tha
LenaWriter [7]

Answer:

t=6.4534 s

Explanation:

This is an exercise where you need to use the concepts of <em>free fall objects</em>

Our <u>knowable variables</u> are initial high, initial velocity and the acceleration due to gravity:

y_{0}=75m

v_{oy} =20m/s

g=9.8 m/s^{2}

At the end of the motion, the <u><em>rock hits the ground</em></u> making the final high y=0m

y=y_{o}+v_{oy}*t-\frac{1}{2}gt^{2}

If we <em>evaluate the equation</em>:

0=75m+(20m/s)t-\frac{1}{2}(9.8m/s^{2})t^{2}

This is a classic form of <u><em>Quadratic Formula</em></u>, we can solve it using:

t=\frac{-b ± \sqrt{b^{2}-4ac } }{2a}

a=-4.9\\b=20\\c=75

t=\frac{-(20) + \sqrt{(20)^{2}-4(-4.9)(75) } }{2(-4.9)}=-2.37s

t=\frac{-(20) - \sqrt{(20)^{2}-4(-4.9)(75) } }{2(-4.9)}=6.4534s

Since the <u><em>time can not be negative</em></u>, the <em>reasonable answer</em> is

t=6.4534s

8 0
3 years ago
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