A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?

Answers

Answer 1

Answer: "10" is not a very satisfying description of an angle.
I'll assume it's 10 degrees, and that it's the angle of the initial trajectory
above the horizontal.

The vertical component of the ball's speed is 30 sin(10°) = 5.209 meters per second.

The acceleration of gravity is 9.8 meters per second² downward.

The ball continues to rise for 9.8/5.209 = 1.881 seconds after the kick.
At that time, it reaches the peak of its arc, and if nobody else has contacted it yet,
it begins to fall, and takes the same length of time to return to the ground whence
it was kicked.

So the time between the kick and return to the ground is (2 x 1.881) = 3.763 seconds.

Note: As is customary and necessary at the high school level,
we assume no air resistance.

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True or False.. Although the Kinetic Theory of Matter states that the particles that make up all matter are in perpetual motion, we know that this isn’t really correct because solids don’t move.

Answers

The answer is false because kinetic energy contains motion!

The answer is false because the Kinetic Theory of Matter does not involve particles that make up all matter

When this current is closed which way does the current flow

Answers

Well, Godess, that's not a simple question, and it doesn't have
a simple answer.

When the switch is closed . . .

"Conventional current" flows out of the ' + ' of the battery, through R₁ ,
then through R₂ , then through R₃ . It piles up on the right-hand side of
the capacitor (C). It repels the ' + ' charges on the left side of 'C', and
those flow into the ' - ' side of the battery. So the flow of current through
this series circuit is completely clockwise, around toward the right.

That's the way the first experimenters pictured it, that's the way we still
handle it on paper, and that's the way our ammeters display it.

BUT . . .

About 100 years after we thought that we completely understand electricity,
we discovered that the little tiny things that really move through a wire, and
really carry the electric charge, are the electrons, and they carry NEGATIVE
charge. This turned our whole picture upside down.

But we never changed the picture ! We still do all of our work in terms of
'conventional current'. But the PHYSICAL current ... the actual motion of
charge in the wire ... is all exactly the other way around.

In your drawing ... When the switch is closed, electrons flow out of the
' - ' terminal on the bottom of the battery, and pile up on the left plate of
the 'C'. They repel electrons off of the right-side of 'C', and those then
flow through R₃ , then through R₂ , then through R₁ , and finally into the
' + ' terminal on top of the battery.

Those are the directions of 'conventional' current and 'physical' current
in all circuits.

In the circuit of YOUR picture that you attached, there's more to the story:

Battery current can't flow through a capacitor. Current flows only until
charges are piled up on the two sides of 'C' facing each other, and then
it stops.

Wait a few seconds after you close the switch in the picture, and there is
no longer any current in the loop.

To be very specific and technical about it . . .

-- The instant you close the switch, the current is

(battery voltage) / (R₁ + R₂ + R₃) amperes

but it immediately starts to decrease.

-- Every (C)/((R₁ + R₂ + R₃) seconds after that, the current is

e⁻¹ = about 36.8 %

less than it was that same amount of time ago.

Now, are you glad you asked ?

What is the acceleration of a 10 kg object if a force of a 3 N is applied?

Answers

The acceleration of the object is 0.3 m/s² when the force applied on the object.

What is force?

Physics defines force as the push or pull that modifies the velocity of a massed object. An external force is a force that can change a body's resting or moving condition. There is a magnitude and a direction to it.

You may measure the Force using a spring balance. The unit of force in the SI is the Newton.

According to Newton's second law of motion: force applied on any object is equal to the change in momentum of the object per unit time.

Hence, F = dP/dt

F = m dv/dt = ma

So, force = mass × acceleration

Given force applied on the object = 3 N

Mass of the object = 10 kg

Hence, the acceleration of the object is = Force ÷ mass

= ( 3 ÷ 10) m/s²

= 0.3 m/s²

Learn more about force here:

brainly.com/question/13191643

#SPJ6

Acceleraction = Force ÷ Mass

3N ÷ 10kg = 0.3m/s²

Which terrestrial planet experiences the shortest year?A. Mars
B. Earth
C. Venus
D. Mercury

Answers

D. Mercury
Its year only takes 88 Earth days.

BTW, you could get this exact information if you visit a revolutionary new search engine called Google. Enter in this exact question and Google will return the answer. :)

Also, you probably should know, the closer the planet is to the Sun, the faster it revolves around it, therefore it has a shorter year, and since Mercury is the first planet next to Sun it means that Mercury has the shortest year ☺

Geologists cannot yet predict earthquakes because

Answers

Geologists cannot yet predict earthquakes because the earthquakes caused by the movement of plates do not have the precise time and place when will it moves.

Is paper a good water absorbent ?

Answers

paper is not a good water absorbant.

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Inertia is ______ to mass. directly proportional inversely proportional equal to not related to