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3 years ago

Read this /https://www.carbonbrief.org/polar-bears-and-climate-change-what-does-the-science-say

Physics

1 answer:

DerKrebs [107]3 years ago

5 0

Melting ice would damage this polar bears habitat meaning the polar bear may decrease

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What best describe the location of an atom's electrons

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Electrons circle the outside of the nucleus.

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3 years ago

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Study the image below. What interaction causes the water to spread as they pass through the rock opening?

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I think is diffracton.

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The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hou

kirill115 [55]

Answer:

Part A

it would take 6 sec

it would take 3 sec

Explanation:

We are told that the power supplied to the wheel is constant which means that the sport car is gaining energy i.e

$power \ \alpha \ energy$

Hence if power is constantly supplied energy constantly increase

From the formula of the Kinetic energy

$KE = \frac{1}{2} mv^2$

we can see that as the speed doubles from 29 mph to 58 mph the energy needed is $2^2$ = 4 times of the energy from the formula

Also the time needed would also be 4 times because energy i directly proportional to time

Hence to reach 58mph the time that it would take is

= $4* 1.5sec = 6sec$

We are told that the ground pushes the car with a constant force and

F = ma

this means that the acceleration is also constant

now from newtons law

v = u +at

Looking at it we see that final velocity is directly proportional with time

hence it would take twice the time to reach twice the final velocity

Time to reach 58mph = 3 s

since time to reach 29 mph( $\frac{1}{2} \ of \ [58mph]$ ) =( $\frac{1}{2} \ of \ 3sec$ )1.5 s

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3 years ago

Describe the objects that make up Saturn's rings. Your answer should include the range of sizes of objects in the rings, and the

aniked [119]

Saturn's rings are made of billions of pieces of ice, dust and rocks. Some of these particles are as small as a grain of salt, while others are as big as houses.

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3 years ago

(1 point) An object moves along a straight track from the point (−5,4,3)(−5,4,3) to the point (−2,13,−6)(−2,13,−6). The only for

Pavel [41]

Answer:

-15Nm

Explanation:

Work is said to be done when a force causes an object to change its position.

Workdone = Force × Distance

Given the force (−2i+2j+3k)N

Since the body moves from point (−5,4,3) to the point (−2,13,−6), we will take the difference of both points to get the distance covered.

The difference will be final point (-2,13,-6) minus initial point (-5,4,3) i.e (-2,13,-6) - (-5,4,3) = (3,9,-9)

This point can be represented vectorially as (3i+9j-9k)meters

Work done = (−2i+2j+3k)×(3i+9j-9k)

Note that i.i = j.j = k.k = 1, the multiplication of different components will give "zero"

Work done = (-2×3)+(2×9)+(3×-9)

Work done = -6+18-27

Work done= -15Nm

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3 years ago