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3 years ago

Which of the following is a force?

Physics

1 answer:

lidiya [134]3 years ago

8 0

Answer:

weight

Explanation:

The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.

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Which planet has a ring system made of mostly water ice?

fredd [130]

Answer:

The answer would be Saturn.

Explanation:

Hope this helps. Please mark me Brainliest

4 0

3 years ago

Read 2 more answers

A cabbie is trying to stop when he notices a fare is whistling them over. The car has 18750 J of energy. If the cab is 2100 kg.

Bogdan [553]

Answer:

Explanation:

ASSUMING that the cab has ONLY kinetic energy,

(it's not sitting over a loaded spring, high on a hill, on fire)

KE = ½mv²

v = √(2KE/m)

v = √(2(18750)/2100) = √17.85714...

v = 4.225771...

v = 4.23 m/s or about 15.2 km/hr

5 0

3 years ago

What is photosynthesis

MA_775_DIABLO [31]

Answer:

The process

Explanation:

the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

6 0

3 years ago

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You walk 10 miles north, 20 miles south, and 5 miles north. Taking north to be the positive y direction, define a position vecto

gulaghasi [49]

Considering north as positive Y axis

First 10 miles north means a positive 10 displacement along y direction

Second 20 miles south means a negative 20 displacement along y direction

Third 5 miles south means a positive 5 displacement along y direction

So total displacement = 10 - 20 + 5 = -5 miles displacement

So position vector of the final position = - 5 j

3 0

4 years ago

A fan rotating with an initial angular velocity of 1000 rev/min is switched off. In 2 seconds, the angular velocity decreases to

Vladimir [108]

The average angular acceleration of the fan is

$\alpha_{\rm avg}=\dfrac{\Delta\omega}{\Delta t}=\dfrac{200\frac{\rm rev}{\rm min}-1000\frac{\rm rev}{\rm min}}{2\,\rm s}=-6.67\dfrac{\rm rev}{\mathrm s^2}$

The number of revolutions after time $t$ is given by

$\theta=\omega_0t+\dfrac{\alpha}2t^2$

Acceleration is assumed to be constant, so $\alpha=\alpha_{\rm avg}$ and over the 2 second interval we have

$\theta=\left(1000\dfrac{\rm rev}{\rm min}\right)(2\mathrm s)+\dfrac{\alpha_{\rm avg}}2(2\,\mathrm s)^2=20\,\mathrm{rev}$

so the answer is A.

5 0

3 years ago