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3 years ago

What is the time interval in which the average velocity is Negative?

Physics

1 answer:

expeople1 [14]3 years ago

5 0

Explanation:

Average velocity indicates direction and can be represented as a negative number when the displacement is in the negative direction. Average speed does not indicate direction and can only be positive or zero.

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If the incoming solar radiation is scattered, it __________.

Lina20 [59]

Answer:

The wavelength is longer and warms the atmosphere

Explanation:

Hope it helps sorry it is late

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3 years ago

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A 70.0-kg skier is sliding at 4 m/s when they slide down a 2m high hill. At the bottom of the hill they run into a large 2800 N/

Katarina [22]

Answer:

$\Delta x=245\ mm$

Explanation:

Given:

mass of skier, $m=70\ kg$

initial velocity of skier, $u=4\ m.s^{-1}$

height of the hill, $h=2\ m$

spring constant, $k=2800\ N.m^{-1}$

final velocity of skier before coming in contact of spring:

Using eq. of motion:

$v^2=u^2+gh$

$v^2=4^2+9.8\times 2$

$v=5.9666\ m.s^{-1}$

Now the time taken by the skier to reach down:

$v=u+gt$

$5.9666=4+9.8\ t$

$t=0.2007\ s$

Now we calculate force using Newton's second law:

$F=\frac{dp}{dt}$

$F=\frac{m(v-u)}{t}$

$F=\frac{70\times(5.9666-4)}{0.2007}$

$F\approx686\ N$

∴Compression in spring before the skier momentarily comes to rest:

$\Delta x=\frac{F}{k}$

$\Delta x=\frac{686}{2800}$

$\Delta x=0.245\ m$

$\Delta x=245\ mm$

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3 years ago

A light wave with a wavelength of 612nm in a vacuum travels through a bit of fused quartz which has an index of refraction of n=

Korolek [52]

The answer is chicken nuggets
mark me brainliest

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4 years ago

Sunlight is observed to focus at a point 18. 5 cm behind a lens. what kind of lens is it? b. what is the focal length of the len

topjm [15]

Sunlight focuses at a point 18.5 cm behind the lens. As daylight comes from an indefinite distance, so it is a real image. The lenses that will focus on the parallel rays behind the lens are converging lenses.

What is a converging lens?

A converging lens causes parallel rays of light to come to a focal point.
A convex lens is a converging lens.
A converging lens has a positive focal length.
A converging lens forms a real or virtual image of a real object.

For more information, please visit: brainly.com/question/3359672?referrer=searchResults

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2 years ago

How much potential energy does a 20-kg barrel have when it is in the truck whose floor is 5.0 m above the ground? P.E. = J

MrRa [10]

The answer is 980 J.

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3 years ago

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