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Alex17521 [72]
3 years ago
15

Which layer of the earth includes the ozone layer

Physics
1 answer:
Rus_ich [418]3 years ago
7 0
Troposphere is the answer
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One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 2.08 km. They start at the
Arada [10]

Answer:

Explanation:

a ) Distance travelled by them = 3 / 4 x 2π R where R is radius of the circular path .

= .75 x 2 x 3.14 x 2.08

= 9.8 km approx

b )

Displacement = shortest distance between final and initial position

= √2 R

= 1.414 x 2.08

= 2.94 km approx

c ) The direction of displacement is towards north east

so the direction is 45° north of east .

6 0
3 years ago
Read 2 more answers
The boy soon loses his balance and falls backwards off the board at a velocity of 1.0 m/s. Assuming momentum is conserved in thi
Andrei [34K]

Answer:

(a) W(s) = M*g

(b) 7.84kg

(c) - 10.07m/s

Explanation:

Parameters given:

Mass of boy, m = 79kg

Initial velocity of boy before jumping on the skateboard, u(b) = 1.55m/s

Final velocity of boy after jumping on the skateboard, v(b) = 1.41m/s

Mass of skateboard, M = ?

Initial velocity of skateboard = u(s)

Final velocity of skateboard = v(s)

(a) The weight of the skateboard is given as the mass of the skateboard multiplied by acceleration due to gravity. Mathematically,

W = M * g

Where g = acceleration due to gravity

(b) Using the law of conservation of momentum, we have that:

m*u(b) + M*u(s) = m*v(b) + m*v(s)

We know that after jumping on the skateboard, the boy and the skateboard have the same final velocity, hence,

v(b) = v(s) = v

=> m*u(b) + M*u(s) = (m + M) * v

Making M the subject of the formula, we have that:

M = m{u(b) - v} / v

M = 79 * (1.55 - 1.41) / 1.41

M = 7.84kg

(c) According to Newton's third law of motion, the momentum of the boy after falling must be equal to but opposite the momentum of the skateboard. This is the concept that birthed the law of conservation of momentum.

Momentum is given as:

P = m*v

Where P = momentum

m = mass of object

v = velocity of object

Therefore, applying Newton's third law of motion:

m * v(b) = -M * v(s)

Where

v(b) is now the velocity of the boy after failing off the skateboard = 1.0m/s

v(s) is now the velocity of the skateboard after the boy falls off.

Making v(s) subject of the formula, we have that:

v(s) = m * v(b) / M

v(s) = -(79 * 1.0) / 7.8

v(s) = -10.07m/s

The negative sign means that that velocity of the boy is opposite the velocity of the skateboard.

4 0
3 years ago
Movie Town Water Effect Physics project
tino4ka555 [31]

Answer:

Ya right...

So water does have to do with physics...

i don't understand the question...

uhhhh

umm

*  *

/~\

ya umm...

ok ile see you...

later...

bye

4 0
3 years ago
A substance that speeds up a chemical reaction without undergoing a permanent change itself is a(n)
ratelena [41]
<h3>Answer:</h3>

Catalyst

<h3>Explanation:</h3>

To answer the following question we need to ask ourselves the following questions;

What is a catalyst?

  • A catalyst is any substance that increases the rate at which a chemical reaction occurs.

How does it perform its function?

  • Catalysts increase the rate of chemical reaction without be consumed.
  • They do so by reducing the amount of activation energy of the reactants. By so doing the rate of formation of products increases.

Do catalysts undergo any change after the reaction?

  • Catalysts do not undergo permanent changes during the reaction. They remain the same at the end of the reaction/
8 0
3 years ago
If a true bearing of a ship at sea is 227°, what is its direction angle?
Ghella [55]
I believe it’s B 313 degree
4 0
2 years ago
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