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3 years ago

What happens to a falling object when the force of air resistance equals the force of gravity?

Physics

2 answers:

12345 [234]3 years ago

7 0

Answer:

A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance that is equal to their weight.

Explanation:

borishaifa [10]3 years ago

7 0

Answer:

so its basically termonal velocity

Explanation:

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A particle moves according to a law of motion s = f(t), t ≥ 0, where t is measured in seconds and s in feet. f(t) = 0.01t4 − 0.0

ivolga24 [154]

Since you solved a and b I will start with part c.
Part C
To answer this question we need to find zeros of a velocity function:
$v(t)=0.04t^3-0.06t^2$
We can factor this polynomial:
$v(t)=0.04t^3-0.06t^2=t^2(0.04t-0.06)$
Now it's pretty easy to find zeros. This function will be equal to zero when any of the factors are equal zero.
$t^2=0;\\ 0.04t-0.06=0$
We solve these two equations and we get our zeros:
$t_1=0; t_2=\frac{3}{2}$
The particle is at rest at t=0 and t=3/2.
Part D
To solve this we need to determine when our velocity function is greater than zero. We will use factored form.
We determine when each factor is greater than zero and with that information, we build the following table:
$\centering \label{my-label} \begin{tabular}{lllll} Range & -\infty & 0 & 3/2 & +\infty \\ t^2 & - & + & + & + \\ 0.04t-0.06 & - & - & + & + \\ t^2 (0.04t-0.06) & + & - & + & + \end{tabular}$
We can see, from the table, that our function is positive when $- \infty < t$ and t>3/2.
That is the range in which particle is moving in positive direction.
Part E
We know that distance traveled is given with:
$s(t)=0.01t^4 - 0.02t^3$
We simply plug in t=12 to find total distance traveled:
$s(12)=0.01(12)^4 - 0.02(12)^3=172.80 ft$
Part F
We know that acceleration is defined as a rate of change of velocity.
We find acceleration by taking the first derivative of velocity with respect to time.
$a(t)=\frac{dv}{dt}=(0.04t^3-0.06t^2)'=0.12t^2-0.12t$
To find acceleration after 1 second we simply plug in t=1s in above equation:
$a(1)=0.12-0.12=0$

7 0

3 years ago

A conducting coil of 1850 turns is connected to agalvanometer, and the total resistance of the circuit is 45.0 ohm.The area of e

Xelga [282]

Answer:

0.459 Tesla

Explanation:

Faraday's law:

$Emf = -N\frac{\delta\phi}{\delta t}$

Φ= NAB

V = N Δ (BA) /Δt

the change in BA

was: BA = 0 because initially B was zero.

V=IR

IR = N B A /Δt

q / Δt ×R = N B A / Δt

Or: B = q R / NA = 8.87 x 10^-3 × 45.0 / 1850×4.7 x 10^-4 =

= 0.459 Tesla

3 0

3 years ago

In Part 5.2.3 of the experiment, you will measure the index of refraction of yellow light using Lab Manual Equation 5.2. Suppose

iren [92.7K]

Answer:

The answer is "1.26".

Explanation:

$D=18^{\circ}$

The refractive index is:

$\to \mu=2\sin(30^{\circ}+\frac{D}{2})\\\\$

$=2\sin(30^{\circ}+\frac{18^{\circ}}{2})\\\\=2\sin(30^{\circ}+9^{\circ})\\\\=2\sin(30^{\circ}+9^{\circ})\\\\=2\sin(39^{\circ})\\\\=2 \times 0.63\\\\=1.26$

8 0

3 years ago

A runner starts at position 0, and moves in one direction to position 12m. What is the distance traveled by the runner? What was

Harrizon [31]

Since the runner only moved in one direction, his distance and placement are the same.

The distanced travelled/his displacement is 12 metres. :)

5 0

3 years ago

Read 2 more answers

A wave and a pendulum are both oscillators. why isn't a pendulum a wave? <br> Please help ..

Fynjy0 [20]

-- A wave travels from place to place.
   A pendulum just sits there.

-- A wave carries energy. A pendulum has energy,
   but doesn't take it anywhere.

-- A wave is a traveling pattern of maximums and minimums
   that all exist at the same time but in different places.
   A pendulum is a stationary pattern of maximums and minimums
   that all exist in the same place but at different times.
   (I made this one up just now; I really like it.)

What makes you think that all oscillators must be pendulums,
or must be waves, or must be both, anyway ?

A guitar string is an oscillator that has waves on it,
but no pendulum anywhere nearby.

A car horn is an oscillator that sends waves out
but there's no pendulum anywhere nearby.

An analog wrist watch has an oscillator in it, which is
actually a torsion pendulum, but there are no waves
anywhere nearby.
_____________________________

Going just one step further with the logic of your question ...
If the logic held water, then we would have to ask:
A horse and a dog are both animals.
So why isn't a horse a dog ?

4 0

3 years ago