PHYSICS HIGH SCHOOL

The hardest known natural material is _____.

Answers

Answer 1
Answer: Diamond is the hardest naturally occurring substance found on Earth. 
Answer 2
Answer:

Answer:

Diamond is the hardest naturally occurring substance found on Earth.because its sharp and heavy + hard

Explanation:

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A block slides down a rough ramp with a 30-degree incline as shown.
During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the sprinter’s average acceleration during this period?
Help!!!!1. A material that can be hit without shattering is?viscous, flammable, hard, malleable2. At room temp., a substance with a melting point of 40% C is a?solid, liquid, gas, mixture3. what action involves a chemical change?making ice cubes,adding sugar to tea, cutting wrapping paper, baking a cake4.a substance that has a little tendency to change into other substance is said to have low?reactivity, viscosity, density, conductivity5. formation of a precipitate is usually evidence of?the separation of a mixture, a chemical change, formation of a mixture, physical change
Atoms form two types of bonds. Which describes these bonds? A. In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred. B. In a covalent bond, valence electrons are transferred; in an ionic bond, valence electrons are shared. C. In a covalent bond, outer electron orbitals are shared; in an ionic bond, outer electron orbitals are transferred. D. In a covalent bond, outer electron orbitals are transferred; in an ionic bond, outer electron orbitals are shared.

Please help me A person launches a home-built model rocket straight upinto the air at y = 0 from rest at time t = 0 . (The positive y-direction is upwards). The fuel burns out at t = t0. The position of the rocket is given by


with a0 and g are positive. Find the y-components of the velocity and acceleration of the rocket as a function of time. Graph ay vs t for 0 < t < t0.

Answers


-- We know that the y-component of acceleration is the derivative of the
y-component of velocity.

-- We know that the y-component of velocity is the derivative of the
y-component of position.

-- We're given the y-component of position as a function of time.

So, finding the velocity and acceleration is simply a matter of differentiating
the position function ... twice.

Now, the position function may look big and ugly in the picture.  But with the
exception of  't' , everything else in the formula is constants, so we don't even
need any fancy processes of differentiation.  The toughest part of this is going
to be trying to write it out, given the text-formatting capabilities of the wonderful
envelope-pushing website we're working on here.

From the picture . . . . . y (t) = (1/2) (a₀ - g) t² - (a₀ / 30t₀⁴ ) t⁶

First derivative . . . y' (t) = (a₀ - g) t  -  6 (a₀ / 30t₀⁴ ) t⁵  =  (a₀ - g) t  -  (a₀ / 5t₀⁴ ) t⁵

There's your velocity . . . /\ .

Second derivative . . . y'' (t) = (a₀ - g) -  5 (a₀ / 5t₀⁴ ) t⁴ = (a₀ - g) -  (a₀ /t₀⁴ ) t⁴

and there's your acceleration . . . /\ .
That's the one you're supposed to graph.

a₀ is the acceleration due to the model rocket engine thrust
     combined with the mass of the model rocket
'g' is the acceleration of gravity ... 9.8 m/s² or 32.2 ft/sec²
t₀  is how long the model rocket engine burns

Pick, or look up, some reasonable figures for a₀ and t₀
and you're in business.

The big name in model rocketry is Estes.  Their website will give you
all the real numbers for thrust and burn-time of their engines, if you
want to follow it that far.


What type of energy does a spinning turbine have?a. electrical energy
b. nuclear energy
c. thermal energy
d. mechanical energy

Answers

The type of energy of a spinning turbine is mechanical energy. The answer is letter D. There are two types of modern wind turbines. In a Verical-axis wind turbines (VAWTs), the shaft is mounted on a vertical axis perpendicular to the ground. They are aligned with the wind so there’s no adjustment necessary when the wind direction changes. It can’t start moving on itself that is why it needs a boost from its electrical system to get started. It uses wires for support so the rotor elevation is lower. They are less efficient than HAWTs due to its lower elevation. Lower elevation means slower wind due to ground interferences. The other type is Horizontal-axis wind turbines (HAWTs), the shaft s mounted horizontally parallel to the ground. It is constantly aligned with the wind using a yaw-adjustment mechanism. This mechanism moves the entire rotor left or right in small increments. It uses a tower to lift the turbine components to an optimum elevation for wind speed and take up very little ground space. It is much more efficient than VAWT. 

Answer: A ITS A BTW

Explanation:

If a 6-kg bowling ball is rolled down the bowling lane with a force of 12 N, what is the acceleration of the ball?

Answers

A= 2M/S squared should b ur answer

What group does paracetamol come under

Answers

Paracetamol is grouped within the 'painkillers' category. 

Your friend won the race that you were both running. Instead of being gracious, your friend made fun of you for losing, and now you don't want to run anymore. What is this an example of? Positive peer pressure Negative peer pressure Positive peer influence Negative peer influence

Answers

Answer: Option (d) is the correct answer.

Explanation:

When my friend made fun of me for loosing the race then obviously this thing left me with no confidence. Also, I would feel shame for losing.

As a result, i have decided not to run anymore.

This represents an example of negative peer influence as the comments or fun made by my friend has made me come to a negative decision.
negative peer influence

Is the moon blocking the sun an eclipse of the sun

Answers

Eclipse of the Sun is happen when Moon blocks Sun light and make a shadow of it on earth so the answer is yes.
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