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nlexa [21]
3 years ago
7

if Steve throws the football 50 meters in 3 seconds, what is the average speed (velocity) of the football ?

Physics
1 answer:
Law Incorporation [45]3 years ago
4 0

<span>(50 meters) / (3 seconds) = (50/3) (meters/sec) = (16 and 2/3) meters/sec .

Speed is correct.
It's NOT velocity.
They're different things.</span>

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Consider a model of a hydrogen atom in which an electron is in a circular orbit of radius r = 5.92×10−11 m around a stationary p
DaniilM [7]

Answer:

2.068 x 10^6 m / s

Explanation:

radius, r = 5.92 x 10^-11 m

mass of electron, m = 9.1 x 10^-31 kg

charge of electron, q = 1.6 x 10^-19 C

As the electron is revolving in a circular path, it experiences a centripetal force which is balanced by the electrostatic force between the electron and the nucleus.

centripetal force = \frac{mv^{2}}{r}

Electrostatic force = \frac{kq^{2}}{r^{2}}

where, k be the Coulombic constant, k = 9 x 10^9 Nm^2 / C^2

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\frac{kq^{2}}{r^{2}}=\frac{mv^{2}}{r}

v=\sqrt{\frac{kq^{2}}{mr}}

v=\sqrt{\frac{9\times 10^{9}\times1.6\times 10^{-19}\times 1.6\times 10^{-19}}{9.1\times 10^{-31}\times 5.92\times10^{-11}}}

v = 2.068 x 10^6 m / s

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6 0
3 years ago
What two characteristics do electromagnetic waves vary in?
rosijanka [135]
They size of the wave and the time of a certain wave.
4 0
3 years ago
Read 2 more answers
Can someone help me?!!!!!
SOVA2 [1]

Answer:magnitude -5; angle 160°

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Vector A is described as having magnitude 5 and angle -20°.

To get an equivalent vector, we either leave the magnitude at 5 and add 360° to the angle, or we reverse the magnitude to -5 and add 180° to the angle.

5 @ -20° = 5 @ 340°

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The third one is the answer.

8 0
3 years ago
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velikii [3]

Answer: A

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Using right hand rule, the magnetic force is perpendicular to the plane form by the magnetic field of a charged particle and its speed. Which will be into the screen.

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5 0
3 years ago
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frez [133]

Answer:

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Generally, more massive objects will have more intertia than less massive objects.  As such it takes more force to halt a more massive object if its moving at the same speed as a smaller object. This can also be thought of in the context of Newton's second law. The more force needed to accelerate an object means the more force the object will have.

6 0
2 years ago
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