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2 years ago

Which quantity is a vector quantity?

Physics

1 answer:

stiks02 [169]2 years ago

4 0

Explanation:

displacement, velocity, and acceleration are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars. To qualify as a vector, a quantity having magnitude and direction must also obey certain rules of combination.

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Oil has a density ρ of 860kg/m3. an oil droplet is suspended between two plates 1.0cm apart by adjusting the potential differenc

schepotkina [342]

After reaching the terminal velocity the speed of the oil drop is given as

$v = \frac{d}{t}$

it drop by 3 mm in 7.33 s

$v = \frac{0.003}{7.33}$

$v = 4.1 * 10^-4 m/s$

now by the formula of terminal speed

$6\pi \eta r v = \rho* \frac{4}{3}\pi r^3g$

$v = \frac{2}{9/eta}r^2\rho g$

$4.1*10^{-4} = \frac{2}{9*1.83 * 10^{-5}}*r^2*860*9.8$

$r = 0.16 mm$

so the radius of drop is 0.16 mm

Now the electric field between the plates is given as

$E = \frac{\Delta V}{\Delta x}$

$E = \frac{1177}{0.01} = 1.177* 10^5 N/C$

now we will use the condition of equilibrium

$qE = mg$

$q*1.177 * 10^5 = \rho* \frac{4}{3}\pi r^3 *9.8$

$q*1.177 * 10^5 = 860* \frac{4}{3}\pi *(0.16*10^{-3})^3*9.8$

$q = 1.2 * 10^{-12} C$

so above is the charge on the drop

7 0

4 years ago

What happens to the spring when we sit on a sofa

irinina [24]

Answer:

Explanation:

bites your as crack

5 0

3 years ago

An aircraft with the mass of 300000kg is flying at an altitude of 2000m with a speed of 100m/s

Savatey [412]

Answer:

Explanation:

K.E is 1/2 mv^2

Therefore KE is 300000×10000×1/2

=1500000000J

= 1500000KJ

Potential energy is mgh

Therefore PE is 300000×9.8×2000

=5,880,000,000J

=5880000KJ

8 0

3 years ago

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An airplane crooses the United States from San Francisco to Boston in 4 hours 20 min. Find the average speed if the distance is

Anna007 [38]

Answer:

999.23 km/h

Explanation:

We can use the formula for average speed as "Distance divided time" to solve the problem.

Let's start by writing the time in hours: 4 h and 20 min is the same as 4 hours + 1/3 of an hour = 13/3 of an hour

Now we use this number in the quotient for average speed:

Average speed = 4330 km / (13/3) h = 12990 / 30 km/h = 999.23 km/h

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3 years ago

A 14 cm object is 20 cm from a concave lens that has a focal length of -10cm.

Hunter-Best [27]

-6.7cm just took the time to put this answer down because its been helping me and its right so good luck

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4 years ago

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