A bird flies 2.8 due west and then 2.7 due north. Another bird flies 2.7 due west and 2.8 due north. What is the angle between the net displacement vectors for the two birds?

Answers

Answer 1
Answer: Assume a 2D plane and both the birds start at origin. +X is east, -X is west, +Y is North, -Y is South. 
So, after travel position of bird1 is (-2.8, 2.7) and bird2 is (-2.7,2.8);
slope of bird1 is 2.8/2.7
slope of bird2 is 2.7/2/8
Now we have two solpes b1 and b2
formula = (b2-b1)/(1+b1*b2);


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(PLEASE HELP) What area of the Earth's mantle is the densest?A.The entire mantle has the same density.
B.the area nearest to the Earth's crust
C.the area in-between the Earth's crust and core
D.the area nearest to the Earth's core

Answers

The area of the Earth'smantle that is the densest is the area nearest to the Earth's core. The correct option is D.

What are the layers of the Earth?

The earth is divided into three layers: the crust, the mantle, and the core. This is the earth's outer layer, and it is composed primarily of solid rock, primarily basalt and granite.

Oceaniccrust and continental crust are the two types of crust. The oceanic crust is denser and thinner, and it is mostly made up of basalt.

The five Earth systems (geosphere, biosphere, cryosphere, hydrosphere, and atmosphere) interact to create the environments we know.

The core is the earth's densestlayer, with a density ranging from 9.5 to 14.5g/cm3.

The Core is divided into two layers: the inner core and the outer core. The interior core is solid, while the exterior core is liquid (or semi-liquid).

Thus, the correct option is D.

For more details regarding the layers of the Earth, visit:

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The area nearest to the earth's core is the densest.. 
So your answer would be letter choice ( D ) . . . 

Hope it Helped :) 

Instead of rolling down the ramp over the step, imagine the ball falls off the back of the ramp directly to the ground. What is the amount of potential energy remaining after the ball lands on the ground?

Answers

0J

According to the law of conservation of energy, the potential energy is converted to kinetic energy. Remember, potential energy is calculated using height and weight. If the ball is on the ground, height is 0.

Assuming the ground has 0 height, than there would be no potential energy.

Does heating a cup of
Water allow it to dissolve more sugar ? Constant

Answers

Answer:

Explanation:

Yes

Answer:

yes

Explanation:

Because the heat allows the the sugar to dissolve easily and stirring it causes it to dissolve even more

How did mendeleev use hydrids in developing his table?

Answers

When Mendeleev arranged the elements in order of increasing atomic mass, the properties where repeated. He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exist but had yet to be discovered.

Besides bones, the skeleton also contains connective tissues called the ???

Answers

Collagenous fibers - Purpose : Bind bones and other tissues to each other

Elastic Fibers : - Purpose : 
Allow organs like arteries and lungs to recoil

Reticular Fiber : - Purpose : 
Form a scaffolding for other cells

Hope this helps ! <3 :)
Besides bones, the skeleton also contains connective tissues called the Cartilage. It is usually flexible and tough.

Describe three ways you can conserve energy in your own home

Answers

Turn lights off, unplug electronics, and use solar energy
you can turn off the air conditioning
you can keep all electronics off
you can turn off all running water