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2 years ago

When air gets hot, it rises and forms…

Physics

1 answer:

NeTakaya2 years ago

5 0

Answer:

Gas

Explanation:

Hot air rises because gases expand as they heat up. When air heats up and expands, its density also decreases.

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A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of fricti

zaharov [31]

Answer:

$\alpha =29.60$

Explanation:

Let the normal force of the wall on the ladder be N2 and the normal force of the ground on the ladder be N1.

Horizontal forces:

$N_{2}= (u1)(N_{1})$ [1]

Vertical forces:

$N_1 + (u2)(N_{2})=m*g$ [2]

Substitute [2] into [1]:

$N_2 = (u1)*[m*g - (u2)(N_2)]$

$N_2= \frac{(u1)m*g}{[1 + (u1)(u2)]}$ [3]

Torques about the point where the ladder meets the ground:

$m*g(\frac{L}{2})sin\alpha= (N_2)(L)cos\alpha+(u2)(N_2)(L)sin\alpha$

$(\frac{1}{2})*m*g=(N_2)*cot\alpha+(u2)(N_2)$

$[1 + (u1)(u2) - 2(u2)(u1)]/2 [1 + (u1)(u2)]= [(u1)/[1 + (u1)(u2)]]cot\alpha$

tanα = $\frac{2*(u1)}{1-u1*u2}$

$\alpha =tan^{-1}*(\frac{2*0.265}{1-0.265*0.253})$

$\alpha =tan^{-1}*(0.568)$

$\alpha =29.60$

4 0

3 years ago

An electromagnetic wave is transporting energy in the negative y direction. At one point and one instant the magnetic field is i

natali 33 [55]

Answer:. Option c

Explanation: the speed of an electromagnetic wave is simply the vector product of the magnetic field and the electric field.

The direction of the velocity is the direction of the electromagnetic wave.

The wave is already moving towards the negative y axis (-j) and the magnetic field is already pointing towards the positive x axis (i)

From cross product of unit vectors

i × j = k

i × k = - j

With the second identity, we can see that the electric field will be pointing towards the positive of the x axis (k).

Option c is validated

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3 years ago

A small ranger vehicle has a soft, ragtop roof. When the car is at rest, the roof is flat. When the car is cruising at highway s

Nezavi [6.7K]

Answer:

roof bow upwards

Explanation:

The top of the roof of the small ranger vehicle will bow upwards. This is as a result of gas pressure on the soft ragtop roof.

As air begins to fill the vehicle, pressure resonates in all direction proportionally.
The pressure of the air will be greater than that which the roof can withstand and this forces the roof sky up.
It is a common scene when we see roof of ragtop vehicles bowing upwards into the sky.

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3 years ago

Kwanzaa farts apple juice

8_murik_8 [283]

Answer:

well

Explanation:

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3 years ago

A system proposed by the U.S. Navy for underwater submarine communication, called ELF (for extremely low frequency), operates wi

kow [346]

Answer

Wavelength= 30*20^8/30=10^7m

Explanation:

Velocity = frequency *wavelength

We're frequency=30HZ

Velocity of light= 3*10^8m/s

Wavelength= 30*20^8/30=10^7m

Explanation:

7 0

3 years ago

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