6. Fig. 3.1 shows a pond that is kept at a conslant depth by a pressure-operated valve in the
base.
water
pressure oporated
va
outlet
spring
Fig. 3.1
(a) The pond is kept at a depth of 2.0m. The density of water is 1000 kam
Calculate the water pressure on the valve.
A. 20 Pa
B.
20000 Pa
o 10000 Pa
D. 100 Pa​

Answer:

answer the question i have asked go to my account

Explanation:

can i get brainliest

Answer:

yes you can go on your account

The energy change caused by an endothermic chemical reaction is the absorption of thermal energy. So, option B.

Endothermic reactions are defined as, those reactions in which the reactants take in heat energy from the environment to create products.

Here,

The endothermic reactions lower the temperature of their surrounding area, thereby creating a cooling effect.

When bonds in the reactants are broken, more energy is absorbed than is released when new bonds are generated in the products. This is known as an endothermic reaction.

A drop in the temperature of the reaction mixture is a characteristic of endothermic reactions.

In endothermic reactions, the enthalpy of the products of the reaction is greater than that of the reactants. Energy is absorbed from the surroundings.

Hence,

The energy change caused by an endothermic chemical reaction is the absorption of thermal energy.

To learn more about endothermic reactions, click:

https://brainly.com/question/23184814

#SPJ5

Answer:

A

Explanation:

ampere is the right answer.

Answer:

I think the answer is Milky Way

I hope this Will help you

Answer:

Time = 3.2 seconds

Explanation:

Given the following data;

Weight = 635 N

Height, h = 2.43 m

Power = 482 Watts

To find the time;

Power = mgh/time

But weight = mg = 635

Substituting into the formula, we have;

482 = (635 * 2.43)/time

482 = 1543.05/time

Time = 1543.05/482

Time = 3.2 seconds

Answer #1:

Physical.

Explanation:

The only thing mentioned to change is the color. Nothing about the gas in general is changing

Answer #2:

Chemical.

Explanation:

The fact this interacted with another element to completely turn something else rather than just being that color makes this a chemical change.

Answer #3:

Physical

Explanation:

Well, how does an element's density have to do anything with a chemical change?

Answer #4:

Chemical.

Explanation:

Fire/heat is involved, and it makes it change states.

Answer: 14 speed of Earth around Sun I see 30 km/s. FALSE

15. Because car is in circle track, direction of velocity changes

And car is in accelerating motion. direction of acceleration points to

The centre of the circle. RIGHT

Explanation:

Answer:

Chemical energy to heat energy to kinetic energy to electrical energy

Answer:

The net force on the hockey puck is zero because it's acceleration is zero due to constant velocity.

The hockey will remain in it's uniform motion unless compelled by an external force.

Explanation:

[tex]from \: vector \: mechanics \\ a = \frac{dv}{dt} \\ but \: at \: constant \: velocity \\ \frac{dv}{dt} = 0 \\ hence : \: \: a = \frac{0}{dt} \\ a = 0[/tex]

Answer:

p=mv

p=given=24500kg-m/sec

m=?

v=20m/sec

m=p/v

=24500kg-m/sec÷20m/sec

=1225kg=ans

Answer:

1225kg=ans

Explanation:

Answer:

the correct one is B

Explanation:

In this exercise, indicate that crocodiles need a warm climate to survive.

The current climate in the western Colorado region where the temperature is 53ºF (11.7ºC) does not allow them to survive, therefore the appearance of fossil crocodiles and fossil subtropical plants and a clear indication that the climate in these regions was much more warm

when checking the answers the correct one is B

Answer:

At maximum  the  current is 4A and resistance is 55Ω

At minimum the current is 1.636A and resistance is 134.45Ω

Explanation:

The computation of the current and the resistance in each case is shown below:

At the time when it is heated at max rate,

power, P = 840W

V = 220V

As We know that

P = VI

840 = 220 × I

I = 840 ÷ 220

I = 4 A

Now

R = V ÷ I

= 220 ÷4

= 55 Ω

Hence, the  current is 4A and resistance is 55Ω

At the time When it is heated at minimum rate,

power, P = 360W

V = 220V

As We know that

P = VI

360 = 220 × I

I = 360 ÷ 220

I = 1.636 A

Now

R = V÷ I

= 220 ÷1.636

= 134.45 Ω

Hence, the current is 1.636A and resistance is 134.45Ω

Answer:

the center of the universe is in your mom's stomach. why do I keep seeing people wanting to look for a date. the f. u. c. k.?

Answer: I really don’t know

Explanation:

Answer:

i think b

Explanation:

i'm not sure

Answer:

I think both pure substance and an element .

hope it is helpful to you ☺️☺️

Answer: If a car travels 300 km in 3 hours, then it’s speed will will be 100 km/hr. But in practical it depends upon type of car, condition of car, car's maximum speed and also the path in which car is travelling.. Because car can't travel in constant speed of 100 km/hr. So, if car have 120 km/hr as maximum speed than it's minimum speed will be 85–95 km/hr. And so the car travel 300 km in around 5 or 5 and half hours.

Answer:

The Moon does not fall towards Earth right now because Earth rotates itself. The energy from the Earth's own rotation around its axis is gradually tranferred into energy of the Moon's orbital motion. That's why the Earth's rotating speed decreases but the distance to the Moon increases.

Answer:

I think No since the gravitational force of earth is not eneogh to pull moon to it

Answer:

I assume you are referring to the standard atomic weight of the elements when you write atomic mass. No elements beyond uranium has a standard atomic weight. The reason is explained by the organization assigned responsibility for the assignment of standard atomic weights,the international Union of Pure and Applied Chemistry commission on isotopic abundances and atomic weights.

Answer:

1. La cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.

2. Se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.

Explanation:

1. La cantidad de materia del Universo se puede calcular a través de su volumen (V) y de su densidad (d):

[tex] d = \frac{m_{u}}{V} = \frac{m}{\frac{4}{3}\pi r^{3}} [/tex]

En donde:

r: es el radio = d/2 = 8,8x10²⁶/2 m = 4,4x10²⁶ m

[tex]m_{u}[/tex]: es la masa del Universo =?

d: es la densidad = 9,9x10⁻²⁷ kg/m³      

[tex]m_{u} = d*v = 9,9 \cdot 10^{-27} kg/m^{3}*\frac{4}{3}\pi (4,4 \cdot 10^{26} m)^{3} = 3,53 \cdot 10^{54} kg[/tex]

Entonces, la cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.

2. La masa del sol es 2x10³⁰ kg, por lo que para completar la masa total del Universo visible se necesitan las siguientes masas solares:

[tex]N = \frac{m_{u}}{m_{s}} = \frac{3,53 \cdot 10^{54} kg}{2\cdot 10^{30} kg} = 1,8 \cdot 10^{24}[/tex]

Por lo tanto, se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.

Espero que te sea de utilidad!  

Answer:

convex and 1 plane mirror

Answer:

The answer is "a, c and b"

Explanation:

Answer:

The volume displacement resulting from the action, minus the original volume.

Explanation:

Mitochondria are essential parts of many eukaryotes, but they are useless without oxygen. Therefore, chloroplasts are extremely important. They produce breathable air for life. Root hairs are seen to not have chloroplasts as their job is to collect water and nutrients.

Answer:

[tex]\boxed {\boxed {\sf 130 \ Newtons }}[/tex]

Explanation:

Work is the energy transferred to or from an object when force is applied to cause displacement. It is the product of force and displacement.

[tex]W=F*s[/tex]

The displacement (s) is 8 meters and the work (W) is 1,040 Joules. Substitute these values into the formula.

[tex]1040 \ J= F* 8 \ m[/tex]

First, let's convert the units. This will make the question easier later on. 1 Joule is equal to 1 Newton meter, so the 1040 J of work equal 1040 N*m.

[tex]1040 \ N*m= F * 8 \ m[/tex]

Since we are solving for the force (F), we must isolate the variable. It is being multiplied by 8 meters and the inverse of multiplication is division. Divide both sides by 8 m.

[tex]\frac {1040 \ N*m}{8 \ m}= \frac{F * 8 \ m}{8 \ m}[/tex]

[tex]\frac {1040 \ N*m}{8 \ m}=F[/tex]

The meters cancel out, hence our earlier unit conversion.

[tex]130 \ N = F[/tex]

A force of 130 Newtons is used.

Answer:

1. An autotroph

2. Domain

3. Reproduction

4. Kingdom

5. Multicellular Organism

6. Genetic trait

Explanation: Took Bio honors 1 & 2

Answer:

A

Explanation:

It would not be C because prokaryotic cells don't have a nucleus. And if you're looking for a body in the cell that controls the nutrients and water it would be A.

Answer:

a

Explanation:

because red litmus paper turn blues under base or alkaline condition