3 years ago

Help me as soon as possible

Physics

1 answer:

Scrat [10]3 years ago

5 0

I think the answer is C.

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g An arrow is shot straight up in the air at an initial speed of 15.5 m/s. After how much time is the arrow moving downward at a

Sati [7]

Answer:

2.11 seconds

Explanation:

We use the kinematic equation for the velocity in a constantly accelerated motion under the acceleration of gravity (g):

$v_f=v_i-g*t\\-5.2 = 15.5 - 9.8\,t\\9.8 \,t= 15.5 + 5.2\\t = 20.7/9.8\\t = 2.11 \,\,sec$

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3 years ago

Batteries supply DC, direct current, which does not change in direction over time, though eventually they get exhausted.

SashulF [63]

My Anonymuos friend, I could not agree more with your statement.
Truer words have rarely if ever been expressed.

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3 years ago

Provide an example of a material that transmits, reflects, and absorbs light simultaneously?

den301095 [7]

A Mirror

Space for 20 letters

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3 years ago

Is nucleus found in animal cells

Luden [163]

Answer:

yes nucleus is found in plant and animal cells.

Hope this helps :)

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3 years ago

How many kilograms of sour cream should be added (stirred into the water) to 0.5 litres of water at T=80°C to cool the water to

matrenka [14]

The mass of the sour cream that should be added is 0.68 kg.

<h3>Mass of the water</h3>

Mass of the water is calculated as follows;

mass = density x volume

density of water = 1 kg/L

mass = (1 kg/L) x 0.5 L = 0.5 kg

<h3>Conservation of energy</h3>

Heat gained by the sour cream = Heat lost by the water

$m_s c_s\Delta \theta _s = m_wc_w\Delta \theta _w\\\\m_s = \frac{m_wc_w\Delta \theta _w}{c_s\Delta \theta _s} \\\\$

where;

Cs is specific heat of sour cream
Cw is specific heat of water
Δθ is change in temperature

$m_s = \frac{0.5 \times 4184 \times (80 - 40)}{3510 \times (40 - 5)} \\\\m_s = 0.68 \ kg$

Learn more about heat capacity here: brainly.com/question/16559442

7 0

3 years ago