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hram777 [196]
3 years ago
11

1. Moving from left to right across a row of the periodic table, which of the following values

Physics
2 answers:
Leto [7]3 years ago
7 0

all of those are right but #2 is a weighted average of the masses of an element's isotopes.

sergiy2304 [10]3 years ago
5 0
1. Atomic Number - the number of protons settle in the nucleus of an atom and it is uniquely classifies a chemical element.

2. The sum of the protons and neutrons in - The atomic mass of an atom of a given element is approximately equal to the number of neutrons + number of protons in that atom. Example: is for Sodium The number of protons is 11 and the number of neutrons is 12. Add the two, you get the atomic mass of 23.

3. Most metals are brittle. It is wrong since most metals are malleable. 

4. Most reactive non-metals. Atoms of these elements effortlessly form compounds by allocating or getting one electron when responding with atoms of the other elements.

5. amu. It is defined as exactly 1/12 the mass of an atom of carbon-12
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It would be f=ma so
a.
 f=m <span>× a</span>
4 0
3 years ago
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At what angle of projectile range of maximum​
Agata [3.3K]

Answer:

45°

Explanation:

The textbooks say that the maximum range for projectile motion (with no air resistance) is 45 degrees.

7 0
4 years ago
6th grade science !!!!!!!!!!!!!!!​
posledela

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71

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5 0
3 years ago
A ball is thrown upward with a speed of 40 m/s. Approximately how much time does it take the ball to travel from the release loc
zvonat [6]

I'm going to assume that this gripping drama takes place on planet Earth, where the acceleration of gravity is 9.8 m/s².  The solutions would be completely different if the same scenario were to play out in other places.

A ball is thrown upward with a speed of 40 m/s.  Gravity decreases its upward speed (increases its downward speed) by 9.8 m/s every second.

So, the ball reaches its highest point after (40 m/s)/(9.8 m/s²) = <em>4.08 seconds</em>. At that point, it runs out of upward gas, and begins falling.

Just like so many other aspects of life, the downward fall is an exact "mirror image" of the upward trip.  After another 4.08 seconds, the ball has returned to the height of the hand which flung it.  In total, the ball is in the air for <em>8.16 seconds</em> up and down.

4 0
3 years ago
In 1939 or 1940, Emanuel Zacchini took his human-cannonball act to an extreme. After being shot from a cannon, he soared over th
Arlecino [84]
 We first determine the vertex by using the formula,<span>-b/2a = vertex, in order to get the values for the t-coordinate. That is why we got 
</span>
v_y=26.5 sin(53)=21.163v_x=26.5 cos(53)=15.948 
then

let x=0since you are going to land on a 3m tally=-.5(9.8)t^2+ 21.163*t
y=0=-4.9t+21.163t=4.31
vx*4.31= total distance travelled=68.88m
Then for the first wheel, you have 15.948m=vxdetermine the time when he reaches 23 meters, that is

23/15.948=1.44218 sec

substitute t with1.44218 sec, then determine the height.
h(1.44218)=20.329

determine vertex by using a graphing calculatort=2.1594s h=22.85m
using the time value of the vertex, determine horizontal distance travelled
34.438m away from cannon
8 0
3 years ago
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