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3 years ago

What element has 5 valence electrons and is in period 3.

Physics

1 answer:

Maru [420]3 years ago

5 0

Answer:

Phosphorous

Explanation:

it is the fifth element from the left and it is in the third period so it has 5 valence electrons

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How is temperature related to the physical change of a substance?

WINSTONCH [101]

When you heat something of cool it down you don't change the substance you might change the why is looks, but it is still the same substance. For example you cool water to 0 degrees Celsius it turns into ice but it still is two parts hydrogen and one part oxygen H2O. Physical changes will change state and/or form but it will still be what it originally was on the molecular level. Hope that helped.

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3 years ago

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The thermal expansion of a solid is caused by:

Shkiper50 [21]

Answer:

Explanation:

The increase in the distance between equilibrium positions for the vibrating atoms.

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3 years ago

Over a span of 6.0 seconds, a car changes its speed from 89 km/h to 37 km/h. What is its average acceleration in meters per seco

faltersainse [42]

Answer: Average acceleration is -2.407 $\frac{m}{s^{2}}$

Explanation:

Average acceleration is equal to change in velocity divided by time taken

therefore, $a=\frac{Vf-Vi}{t}$

=> $a=\frac{37-89}{6}\times \frac{5}{18}\frac{m}{s^{2}} = -2.407 \frac{m}{s^{2}}$

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3 years ago

A rocket is fired straight upward, starting from rest with an acceleration of 25.0 m/s^2. It runs out of fuel at the end of 4.00

ANTONII [103]

Answer:

a) 200m, 100m/s

b) 710.20m

c) -117.98 m/s

d) 26.24 s

Explanation:

To solve this we have to use the formulas corresponding to a uniformly accelerated motion problem:

$V=Vo+a*t$ (1)

$X=Xo+Vo*t+\frac{1}{2}*a*t^2\\$ (2)

$V^2=Vo^2+2*a*X$ (3)

where:

Vo is initial velocity

Xo=intial position

V=final velocity

X=displacement

$X=0+0*4+\frac{1}{2}*25*4^2$

the intial position is zero because is lauched from the ground and the intial velocitiy is zero because it started from rest.

$X=200m$

$V=0+25*4$

$V=100m/s$

The intial velocity is 100m/s we know that because question (a) the acceleration is -9.8 $\frac{m}{s^2}$ because it is going downward.

$0=100^2+2*(-9.8)*X\\X=510.20\\totalheight=200+510.20=710.20m$

In order to find the velocity when it crashes, we can use the formula (3).

the initial velocity is 0 because in that moment is starting to fall.

$V^2=0^2+2*(-9.8)*(710.20)\\V=-117.98 m/s$

the minus sign means that the object is going down.

We can find the total amount of time adding the first 4 second and the time it takes to going down.

to calculate the time we can use the formula (2) setting the reference at 200m:

$-200=0+100*t+\frac{1}{2}*(-9.8)*t^2$

solving this we have: time taken= 22.24 seconds

total time is:

total=22.24+4=26.24 seconds.

3 0

2 years ago

Magnets are either pulled together (attracted) or pushed apart (repelled). Based on what you have seen, when are magnets attract

cluponka [151]

Answer:

The rule to remember is that opposites attract. Every magnet has both a north and a south pole. When you place like poles of two magnets near each other (north to north or south to south), they will repel each other.

Explanation:

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2 years ago

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