What happens to the object when positive velocity and positive acceleration occur?

A tennis ball with a mass of 0.1kg falls off the roof of a building 10.4 meters tall. How long does it take for the ball to hit

Mars2501 [29]

The key formula ==>    H = 1/2 G T²

   10.4 = 1/2 (9.8) T²

Divide each side by 4.9 : T² = 10.4 / 4.9

   T = √ (10.4/4.9) = 1.46 seconds .

The mass of the ball doesn't make any difference. If not for air resistance,
a feather and a school bus, dropped from the same height at the same time,
would fall together, and hit the ground at the same time. We've known this
for roughly 600 years now, and I suspect you learned it in the same high
school class where your question came from.

3 0

3 years ago

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In a uniform p-type Si sample, As is diffused to have a donor profile of 10^18/cm^3, Problems where acceptor concentration becom

viva [34]

Answer:

$\sigma=80 (\Omega.cm)^{-1}$

Explanation:

Na = Acceptor Concentration (cm-3) = 0

Nd = Donor Concentration (cm-3) = $10^{18}$

$\rho$ = Resistivity (Unit: ohm-cm)

n = electron concentration (cm-3)

q =Charge on electron = $1.6\times 10^{-19}$

$t=thickness=5 \times 10^{-4} cm$

$\mu=\mu_{min} +\frac{\mu_{max}-\mu_{min}}{1+\frac{N}{N_{r} }\alpha }$

$\mu_{max}$

$\mu_{min}$

$N_{r}$ are fit parameter

Arsenic is used

$\mu_{max}$ =52.2

$\mu_{min}$ =1417

$N_{r}=9.68\times10^{16} \\\alpha=0.68$

$\mu_{N}$ =222.2

For n type = $p=\frac{1}{qn\mu_{n} }$

$R=\frac{\rho}{t}$

(ND>>NA ---> n-type) // Here The p-type sample is converted to n-type material by adding more donors than acceptors

n=ND-NA =1018/cm3

$\rho=[1.6*10-19*1018*222.2]-1 = 0.28 (ohm-cm)$

R=0.28/5*10-4=560

$Given mobility, \mu=500cm2/V-sec$

$Conductivity= \sigma=\mu*N*q = (500*1018*1.6*10-19)\\Conductivity= \sigma=80 (\Omega.cm)^{-1}$

3 0

3 years ago

1. State Newton's third law of motion and write any three applications of it

Scrat [10]

Answer:

1)When a bullet is fired from the gun with a certain force (action) as a reaction an equal and opposite force is exerted on the gun. 2)when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air.

4 0

3 years ago

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A force is a push or a pull. Under the right circumstances, anything can exert a force.

Sliva [168]

Answer:

Explanation:

the force that you applied caused the notebook to move.

the force applied on the notebook by the table causes it to stop moving.

this is because after sometime the book uses up the force and later the force you applied is less than that of the force by the table.

7 0

4 years ago