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3 years ago

12

I don't have time to sit down and learn this school is almost out and i'm failing PLZ HELP ME SOMEBODY . Chemical reactions happ

en when _____. atoms attract or repel one another heat is created by friction two or more substances are mixed substances are heated or cooled

1 answer:

dezoksy [38]3 years ago

6 0

Chemical reactions happen when TWO or more molecules interact

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What causes competition among organisms?

irga5000 [103]

Answer:

Whats up Bmw,

The organisms is caused when both the organisms or species are harmed, which is limited supply of at least one resource from food or even water used by both can be a factor.

Explanation:

Hope I helped you, and let me know if you need help on anything else :p

8 0

4 years ago

Read 2 more answers

Một mặt phẳng vô hạn tích điện đều, mật độ σ = 4.10-9 C/cm2, đặt thẳng đứng trong không khí. Một quả cầu nhỏ có khối lượng 8 g,

dusya [7]

Answer:

The angle is 18.3 degree.

Explanation:

A uniformly charged infinite plane, density σ = 4 x 10^-9 C/cm^2, is placed vertically in air. A small ball of mass 8 g, with charge q = 10^-8 C, hangs close to the plane, so that the string is initially parallel to the plane. Take g = 9.8m/s2. When in equilibrium, by what angle is the string hanging the ball to the plane?

surface charge density, σ = 4 x 10^-5 C/m^2

Charge, q = 10^-8 C

mass, m = 0.008 kg

Let the angle is A and the tension in the string is T.

The electric field due to a plane is

$E =\frac{\varepsilon \sigma }{2\varepsilon o}\\\\E =\frac{4\times 10^{-5}}{2\times 8.85\times 10^{-12}}\\\\E = 2.26\times 10^6 V/m \\$

Now equate the forces,

$T sin A = q E.... (1)\\\\T cos A = m g ..... (2)\\\\divide (1) by (2)\\\\tan A = \frac{10^{-8}\times 2.6\times 10^6}{0.008\times 9.8}\\\\tan A = 0.33\\\\ A = 18.3 degree$

5 0

3 years ago

A wire of length L is wound into a square coil with 117 turns and used in a generator that operates at 60.0 Hz and 120 V rms val

Goryan [66]

Answer: The length L of the wire used to construct the coil is 191.4m

Explanation: Please see the attachments below

7 0

3 years ago

An electric clothes dryer draws 15 a of current from a 240-v wall outlet. how much power, in watts, does it use?

Nataly [62]

The power consumed by the electric clothes dryer may be calculated by the following equation,

P = I x V

where P is the power, I is the current in amperes, and V is the voltage in volts. Substituting the known values from the given above,

P = (15 A)(240 V)
P = 3600 watts

Therefore, the power consumed by the electric clothes dryer is equal to 3600 watts.

7 0

4 years ago

A car has a mass of 1200 kg and a velocity of 14 m/s. Calculate the<br> momentum of the car.

worty [1.4K]

Answer:

p = 16,800

Explanation:

5 0

3 years ago