Which of the following are indications of a possible volcanic eruption?

You drop a single coffee filter of mass 1.5 grams from a very tall building, and it takes 49 seconds to reach the ground. In a s

Tresset [83]

(a) 0.0147 N

When the filter reaches the terminal speed, it means that its acceleration is now zero, so the net force acting on it is zero.

There are only two forces acting on the filter:

- The weight of the filter, downward: W = mg, where

$m=1.5 g = 0.0015 kg$ is the mass of the filter

$g=9.8 m/s^2$ is the acceleration due to gravity

- The air resistance, upward, $F_a$

Since the net force is zero, we have

$W-F_a =0$

and solving the equation we find the upward force of air resistance:

$F_a=W=mg=(0.0015kg)(9.8 m/s^2)=0.0147 N$

(b) 0.0441 N

The problem is exactly identical to before, but this time the mass of the stack of filters is 3 times the mass of the single filter, so

$m=3 (0.0015 kg)=0.0045 kg$

And so, the upward force of air resistance is

$F_a = mg=(0.0045 kg)(9.8 m/s^2)=0.0441 N$

(c) 28.3 s

We know that the single coffee filter takes t=49 s to reach the ground, travelling at constant terminal speed of v, so the distance covered (the height of the building) is

$d=vt$

where t = 49 s.

We also know that the air resistance is proportional to the square of the terminal speed:

$F_{air} \propto v^2$

which means

$v\propto \sqrt{F_{air}}$

For the stack of three filters, we found (b) that the air resistance is 3 times the air resistance for the single filter (a). Therefore, the terminal speed of the stack of filter will be $\sqrt{3}$ times larger than the terminal speed of the single filter.

Therefore, the time taken will be:

$t'=\frac{d}{v'}=\frac{d}{\sqrt{3} v}=\frac{t}{\sqrt{3}}$

And since t = 49 s, we have

$t'=\frac{49 s}{\sqrt{3}}=28.3 s$

8 0

3 years ago

a custodian pulls a vacuum 13.5 m with a 33.9 N force at a 55.0 degree angle , against a 14.2 N friction force . find the work d

Elenna [48]

Answer:

a. -191.7 J

Explanation:

The work done by a force is given by W = Fdcosθ where F = force applied and d = distance moved and θ is the angle between the force and distance moved.

Here, F = frictional force = 14.2 N

d = distance = 13.5 m

and θ = 180° since the direction of the frictional force and distance are opposite.

So, W = Fdcosθ = 14.2 × 13.5cos180° = -191.7 J

4 0

4 years ago

If someone upsets you, it is your responsibility to make changes so that they don’t do it again. A. True B. False

pochemuha

If someone upsets you ,it is your responsibility to make changes so that they don't do it again.
The statement is true.
As by making changes you don't give them any chances of repeating that thing.
HOPE IT HELPS!!!!
PLEASE MARK BRAINLIEST!!!!

4 0

3 years ago

Read 2 more answers

Someone please help me answer these

nekit [7.7K]

1. GPE

2. KE

3. KE

4. KE

5. Both

6. Both

7. Neither

8. Neither

Alright I think these should be right ;)

4 0

3 years ago

A diver sees a shark, panics, and holds his breath while going to the surface from a depth of 30 m (98 feet). What is likely to

kherson [118]

Answer: Mos likely to drown .

5 0

3 years ago