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3 years ago

Answer them all please!!

Physics

1 answer:

stepladder [879]3 years ago

7 0

Answer:

Digestive = large instestine

respiratory = lungs

circulatory red blood cell

neurons=nerves

Explanation:

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The pressure of a gas is 15 atm in a 5L cylinder. If the volume of the cylinder is depressed to 3L, What is the new pressure exe

disa [49]

P1v1=p2v2. 15x5=p2x3

5 0

3 years ago

I WILL GIVE BRAINLIEST

Sveta_85 [38]

A. Air, desk, water. sound travels the slowest through air and the fastest through liquids. solids are somewhere in the middle.

4 0

3 years ago

A pendulum consists of a stone with mass m swinging on a string of length L and negligible mass. The stone has a speed of v0 whe

Dmitriy789 [7]

Answer:

(a) $v = \sqrt{ mv_0^2 - 2gL(1-\cos(\theta))}$

(b) $\theta = \arccos(\frac{2gL-v_0^2}{2gL})$

Explanation:

(a) The total mechanical energy of the system is conserved.

$K_A + U_A = K_B + U_B\\\frac{1}{2}mv_0^2 + 0 = \frac{1}{2}mv^2 + mgh \\h = L - L\cos(\theta) = L(1 - \cos\theta)\\\frac{1}{2}mv^2 = \frac{1}{2}mv_0^2 - mgL(1-\cos(\theta))\\v^2 = mv_0^2 - 2gL(1-\cos(\theta))\\v = \sqrt{ mv_0^2 - 2gL(1-\cos(\theta))}$

(b) The conservation of energy states

$K_A + U_A = K_M + U_M\\\frac{1}{2}mv_0^2 + 0 = 0 + mgL(1-\cos(\theta))\\1-\cos(\theta) = \frac{v_0^2}{2gL}\\\cos(\theta) = 1-\frac{v_0^2}{2gL} = \frac{2gL-v_0^2}{2gL}\\\theta = \arccos(\frac{2gL-v_0^2}{2gL})$

(c) As explained in part (a) the total mechanical energy of the system is equal to the initial kinetic energy, since the potential energy of the system at that point is zero.

$E_{total}= K_A + U_A = K_A + 0\\E_{total} = \frac{1}{2}mv_0^2$

8 0

3 years ago

Tsunamis are fast-moving waves often generated by underwater earthquakes. In the deep ocean their amplitude is barely noticable,

vovangra [49]

Answer:

v =163.95 m/s

Explanation:

Given that,

The wavelength of wave, $\lambda=646\ km=646\times 10^3\ m$

Distance covered, $d=3630\ km=3630\times 10^3\ m$

We need to find the speed of the wave. We know that,

speed = distance/time

So,

$v=\dfrac{3630\times 10^3\ m}{22140\ s}\\\\=163.95\ m/s$

So, the speed of the wave is equal to 163.95 m/s.

6 0

2 years ago

5. The rate at which an organism uses energy, measured in humans at complete<br> rest.

yuradex [85]

Answer:

n. Abbr. BMR. The rate at which energy is used by an organism at complete rest, measured in humans by the heat given off per unit time, and expressed as the calories released per kilogram of body weight or per square meter of body surface per hour.

Explanation:

3 0

2 years ago