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3 years ago

Please help as much as you can! Thank you

Physics

1 answer:

OLEGan [10]3 years ago

4 0

Firstly these questions are quite simple. You should try to solve your homework by yourself.
Secondly, I think I'm gonna help you.

1.Atom
2.Element
3.Pure substances
4.Mixture
5.Solutions are homogenous mixtures with particle sizes of less than 1nm
Colloids are heterogenous mixtures with particle size of 1 to 1000 nm
Suspensions are heterogenous mixtures with particle sizes above 1 micrometre

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At a certain instant, a ball is thrown downward with a velocity of 8.0 m/s from a height of 40 m. At the same instant, another b

maks197457 [2]

Answer:

(a) The two balls collide $2\; \rm s$ after launch.

(b) The height of the collision is $4\; \rm m$ .

(Assuming that air resistance is negligible.)

Explanation:

Let vector quantities (displacements, velocities, acceleration, etc.) that point upward be positive. Conversely, let vector quantities that point downward be negative.

The gravitational acceleration of the earth points dowards (towards the ground.) Therefore, the sign of $g$ should be negative. The question states that the magnitude of $g\!$ is $10\; \rm m \cdot s^{-2}$ . Hence, the signed value of $\! g$ should be $\left(-10\; \rm m \cdot s^{-2}\right)$ .

Similarly, the initial velocity of the ball thrown downwards should also be negative: $\left(-8.0\; \rm m \cdot s^{-1}\right)$ .

On the other hand, the initial velocity of the ball thrown upwards should be positive: $\left(12\; \rm m \cdot s^{-1}\right)$ .

Let $v_0$ and $h_0$ denote the initial velocity and height of one such ball. The following SUVAT equation gives the height of that ball at time $t$ :

$\displaystyle h(t) = \frac{1}{2}\, g \cdot {t}^{2} + v_0 \cdot t + h_0$ .

For both balls, $g = \left(-10\; \rm m \cdot s^{-2}\right)$ .

For the ball thrown downwards:

Initial velocity: $v_0 = \left(-8.0\; \rm m \cdot s^{-1}\right)$ .
Initial height: $h_0 = 40\; \rm m$ .

$\displaystyle h(t) = -5\, t^{2} + (-8.0)\, t + 40$ (where $h$ is in meters and $t$ is in seconds.)

Similarly, for the ball thrown upwards:

Initial velocity: $v_0 = \left(12\; \rm m \cdot s^{-1}\right)$ .
Initial height: $h_0 = 0\; \rm m$ .

$\displaystyle h(t) = -5\, t^{2} + 12\, t$ (where $h$ is in meters and $t$ is in seconds.)

Equate the two expressions and solve for $t$ :

$-5\, t^{2} + (-8.0)\, t + 40 = -5\, t^{2} + 12\, t$ .

$t = 2$ .

Therefore, the collision takes place $2\, \rm s$ after launch.

Substitute $t = 2$ into either of the two original expressions to find the height of collision:

$h = -5\times 2^{2} + 12 \times 2 = 4\; \rm m$ .

In other words, the two balls collide when their height was $4\; \rm m$ .

3 0

3 years ago

Two capacitors, C1 and C2, give an equivalent capacitance of 9.0 pF when connected in parallel and an equivalent capacitance of

Lilit [14]

Answer:

C₁ = 3 pF

C₂ = 6 pF

Explanation:

Let the capacitance be C₁ and C₂.

For parallel combination

C₁ +C₂ = 9

For series combination

$2=\frac{C_1\times C_2}{C_1+C_2}$

$2=\frac{C_1\times C_2}{9}$

C₁ X C₂ = 18

( 9-C₂ )X C₂ = 18

C₂²- 9C₂ +18 = 0

C₂ = 6 or 3.

C₁ = 3 or 6.

C₁ = 3 pF

C₂ = 6 pF

5 0

3 years ago

Determine usando ecuación de Bernoulli la Presión P1 necesaria para mantener la condición mostrada dentro del sistema mostrado

Amanda [17]

Answer:

PlROCA

Explanation:

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3 years ago

Infrasounds _____.

LiRa [457]

Infra sounds are sounds with frequencies below 20 Hz.The popular concept that infra sounds are in audible holds false

Explanation:

Some example of Infrasounds are- some animals such as whales, elephants and giraffes which communicate with each other using infrasound over long distances.
Various natural phenomenon such as Avalanches, volcanoes, earthquakes, ocean waves, water falls and meteors also generate infrasonic waves
Infrasound, is sound that is lower in frequency than 20 Hz or cycles per second.
Even the human body can generate mechanical vibrations at very low frequencies, which are known as the infrasonic waves. Such low-frequency vibrations/infrasonic waves are produced by physiological processes—such as heartbeats, respiratory movements, blood flow in vessels, and other processes.

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3 years ago

I need to name 20 gases in physics

Oliga [24]

Easy ! EVERY element and every compound melts, then boils and becomes a gas, if you heat it to a high enough temperature. That includes iron, gold, water, salt, glass, almost any substance.

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4 years ago