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3 years ago

Which chemical reaction absorbs energy?

Physics

2 answers:

Tomtit [17]3 years ago

6 0

Photosynthesis is the answer you are looking for i think

torisob [31]3 years ago

4 0

Answer: photosynthesis

Explanation:

Photosynthesis is a chemical reaction in which light energy from sun is absorbed by the chlorophyll pigments of the plant cells. The absorbed energy is required for splitting the molecules of water so as to release oxygen as a byproduct of the reaction. Also carbohydrates like glucose is produced in the reaction as a product which is utilized by the plants so as to obtain the energy for metabolic reactions.

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the pilot of a new stealth helicopter, which has a mass of 15000 kg and was traveling at 180 m/s, accelerated to 250 m/s in 6 s

nirvana33 [79]

Answer:

Force = 175000 newtons

Final momentum = 1050000 N*S

Explanation:

We know that force is equal to Mass * acceleration

We also know that the mass of object is 15,000kg.

We know acceleration is (change in velocity)/time

Our initial velocity is 180m/s

our final velocity is 250 m/s

the time it took was 6 seconds

our change in velocity is 250 - 180 = 70

the time it took was 6 seconds

a = 70/6 = 11.67 m/s^2

So we can calculate force, by doing Mass * Acceleration, which is 15,000 * 11.67

Force is 175000 Newton's

Momentum is calculated by Velocity * mass or Force * time

we could do either one

velocity * mass way

we are given final velocity is 250 m/s, and that the initial velocity is 180 m/s. We first have to find the change in velocity by subtracting final and initial and get 70, and then we multiply that by the mass, which is 15000 kg.

we multiply them together and get 1050000 Kg*m/s

Force * time way

We just calculated the force above, and got 175050 newton's. from that we just multiply by the time, which is 6 seconds

and we get a result of

1050000 Newton*seconds

*** remember newton*seconds is the same as kg*m/s

8 0

3 years ago

Calculate the speed of a car that traveled 200 kilometers in 3 hours.

Elza [17]

Answer:

right option is :- A

Explanation:

3 0

3 years ago

A box of mass 13kg sits on a table with a coefficient of static friction of 0.85. What is the maximum force of static friction?

Alexus [3.1K]

Answer:

108.3 N

Explanation:

The maximum force of static friction acting on the box is given by:

$F=\mu N$

where

$\mu = 0.85$ is the coefficient of static friction

N is the normal reaction of the table on the box

Since the box is in equilibrium along the vertical direction, the normal reaction N is equal to the weight of the box, so:

$N=mg=(13 kg)(9.8 m/s^2)=127.4 N$

And so, the maximum force of static friction is

$F=(0.85)(127.4 N)=108.3 N$

7 0

3 years ago

Four different resistors have various amounts of electric current flowing through them.

salantis [7]

Answer:

Order will be Forth resistor , first resistor, second resistor, third resistor

Explanation:

We have given four different resistance and current flowing through them

In first resistor resistance R = 4 ohm and current flowing i = 6 A

According to ohm's law voltage = current × resistance = 6×4 = 24 volt

In second resistor resistance R = 2 ohm and current i = 9 A

So voltage V = 9×2 = 18 volt

In third resistor resistance R = 2 ohm and current i = 3 A

So voltage V = 3×2 = 6 volt

In forth resistor resistance R = 8 ohm and current i = 8 A

So voltage V = 8×8 = 64 volt

So order of highest voltage to lowest voltage is 64,24,18,6

Forth resistor , first resistor, second resistor, third resistor

5 0

3 years ago

A 36 kg child sits in a swing supported by two chains, each 2.9 m long. If the tension in each chain at the lowest point is 265

natka813 [3]

Answer:

v = 3.78 m/s

Explanation:

given,

mass of the child = 36 Kg

length of the chain, r = 2.9 m

tension in each chain, T = 265 N

now,

Net force acting in the system

2 T - m g = m a

T is the tension in the chain

a is the acceleration in the normal direction

here, $a = \dfrac{v^2}{r}$

now,

$2 T - m g = m\dfrac{v^2}{r}$

$2\times 265 - 36\times 9.8 = 36\times \dfrac{v^2}{2.9}$

v² = 14.274

v = 3.78 m/s

speed of the child at the lowest point is equal to 3.78 m/s

5 0

3 years ago