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Alla [95]
3 years ago
5

What causes air to move recirculate from one place to another

Physics
1 answer:
sergey [27]3 years ago
6 0

Answer:air flow and the movement from where it’s coming from

Explanation:

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The displacement d (m) of a block sliding along a straight line is given by the equation d = -0.65 t + 0.21 t2, where t is the t
ivolga24 [154]

Answer:

<h3><em>0.19m/s</em></h3>

Explanation:

velocity is the change in displacement of a body with respect to time. Given the displacement d (m) of a block sliding along a straight line is given by the equation d = -0.65 t + 0.21 t², where t is the time in seconds, instantaneous velocity is expressed by differentiating the displacement with respect to time

Velocity = dd/dt

Velocity = -0.65 + 2(0.21)t²⁻¹

Velocity = -0.65 + 0.42t

The instantaneous velocity of the block when t = 2.0 s can be gotten by substituting t = 2.0s into the expression above:

Velocity = -0.65 + 0.42(2)

Velocity = -0.65 + 0.84

Velocity = 0.19

<em>Hence the instantaneous velocity of the block when t = 2.0 s is 0.19m/s</em>

4 0
3 years ago
A solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm3. What is the density of rubber?
natita [175]
Mass=33g volume =30cm^3 density=mass/volume = 33/30 =1.1g/cm^3 ans
7 0
4 years ago
The 4.5 cm long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?
Vlada [557]
Angular velocity means how many radians/degrees is this hand passing by every second.
First, you realize it goes through a whole revolution (2\pi in radians) in 60 seconds.
This means for every second, it passes by:
\frac{2 \pi }{60 s} = 0.105  \frac{rad}{sec}

For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)
velocity=0.105 \frac{rad}{sec} *0.045m
velocity=0.004725  \frac{meters}{sec}
5 0
3 years ago
Which of the following is a graph of the velocity of an object as it falls fromrest if drag is not ignored? Explain your choice
MariettaO [177]

The air drag is a force that depends on the speed of an object relative to the wind. Under certain conditions, it can be modeled as:

F=-bv

Where b is a constant.

As a falling object reaches a speed so that its weight is cancelled out by the air drag, the object will reach a maximum velocity.

In a speed vs time gaph, the speed would approach the maximum speed like an asymptote.

On the other hand, since the object falls from rest, the initial speed on the graph must be zero.

Taking these considerations into account, the correct graph for the movement of an object that falls from rest if air drag is not ignored, is option B.

7 0
1 year ago
Thanks+BRAINLIST
Fynjy0 [20]

Answer:

it change speed

Explanation:

its because when light passes through one medium to another (rarer to denser)its velocity change and its speed also changes

3 0
3 years ago
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