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Schach [20]
3 years ago
15

What description best describes both mirrors and lenses?

Physics
2 answers:
Kipish [7]3 years ago
8 0
The only reasonable choice from this list is choice-A.
makkiz [27]3 years ago
7 0
<span>A) Mirrors reflect light and lenses refract light.

I just took the test. 

I hope this helps. :)</span>
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A projectile is launched diagonally into the air and has a hang time of 24.5 seconds. Approximately how much time is required fo
Rasek [7]

Answer:

t=12.25\ seconds

Explanation:

<u>Diagonal Launch </u>

It's referred to as a situation where an object is thrown in free air forming an angle with the horizontal. The object then describes a known path called a parabola, where there are x and y components of the speed, displacement, and acceleration.

The object will eventually reach its maximum height (apex) and then it will return to the height from which it was launched. The equation for the height at any time t is

x=v_ocos\theta t

\displaystyle y=y_o+v_osin\theta \ t-\frac{gt^2}{2}

Where vo is the magnitude of the initial velocity, \theta is the angle, t is the time and g is the acceleration of gravity

The maximum height the object can reach can be computed as

\displaystyle t=\frac{v_osin\theta}{g}

There are two times where the value of y is y_o when t=0 (at launching time) and when it goes back to the same level. We need to find that time t by making y=y_o

\displaystyle y_o=y_o+v_osin\theta\ t-\frac{gt^2}{2}

Removing y_o and dividing by t (t different of zero)

\displaystyle 0=v_osin\theta-\frac{gt}{2}

Then we find the total flight as

\displaystyle t=\frac{2v_osin\theta}{g}

We can easily note the total time (hang time) is twice the maximum (apex) time, so the required time is

\boxed{t=24.5/2=12.25\ seconds}

4 0
4 years ago
Which change of state do particles in a material become farther apart?
crimeas [40]
Particles become farther apart from each other in the change of state between liquid and gas.
Hope that helped =)
6 0
3 years ago
In the semi arid regions of China, the country's inhabitants have practiced water harvesting for generations. Water harvesting i
lapo4ka [179]

Answer: C) By collecting run off during the rainy season for future irrigation increases the agricultural production

Explanation:

Water harvesting is a process of collection of rain water by using special water storing systems. This water storage practice helps during the scarcity of water like in dry summer seasons and in conditions of drought. Such water can be treated with filters to make it potable for drinking. But generally the water is used for the purpose of irrigation in the agricultural field and household sanitary requirements.

On the basis of the above description, By collecting run off during the rainy season for future irrigation increases the agricultural production is the correct option.

3 0
3 years ago
Read 2 more answers
When not in a vacuum, what force causes objects in freefall to fall at different speeds??
Deffense [45]
Hi,

My best answer would be Gravity. Is it a multiple choice question? Or is it an essay question. 
4 0
3 years ago
The Mechanical Advantage equation is written as ___
kompoz [17]
Mechanical advantage = output force/input force

MA = Fo/Fi
8 0
2 years ago
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