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3 years ago

How many electrons do hydrogeyn have?

1 answer:

6 0

A hydrogen atom contains 1 electron, 1 proton, and no neutrons based on the Periodic Table. The isotopes of the hydrogen atoms however, do contain neutrons.

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A 74 kg firefighter slides, from rest, 4.9 m down a vertical pole. (a) If the firefighter holds onto the pole lightly, so that t

In-s [12.5K]

Answer:

Her speed is 9.8 meter per second

Explanation:

Newton's second law states that acceleration (a) is related with force (F) by:

$\sum\overrightarrow{F}=m\overrightarrow{a}$ (1)

Here the only force acting on the firefighter is the weight F=mg so (1) is:

$mg=ma$

Solving for a:

$a=g$

Now with the acceleration we can use the Galileo's kinematic equation:

$Vf^{2}=Vo^{2}+2a\varDelta x$ (2)

With Vf the final velocity, Vo the initial velocity and Δx the displacement, because the firefighter stars from rest Vo=0 so (2) is:

$Vf^{2}=2a\varDelta x$

Solving for Vf

$Vf=\sqrt{2g\varDelta x}=\sqrt{2(9.81)(4.9)}$

$Vf=9.8\frac{m}{s}$

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3 years ago

Sal sprinted 40 m to the right in 5.5s what is his average velocity

PolarNik [594]

Answer: 7.27 m/s

Explanation:

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3 years ago

Question 3 (1 point)

g100num [7]

Answer:

B) 18.5 m/

s west

Explanation:

Scalar quantity has MAGNITUDE only

Vector quantity has MAGNITUDE and DIRECTION

Hope this is correct and helpful

HAVE A GOOD DAY!

3 0

4 years ago

You have to travel 5000 meters. You only have two minutes (120 seconds) to get there. How fast must you travel to get there in t

Sholpan [36]

Answer:

416.667 m/s

Explanation:

divide the distance by the time

8 0

3 years ago

What is the speed of sound

Charra [1.4K]

Answer:it is 343 meter per second in air.

Explanation:

it is 5 times more in liquids than in gases and 15 times more in solids than in gases.In air it is affected by various physical conditions such as pressure,humidity and temperature.

7 0

3 years ago

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