A book is being pushed to the right across a desk with a constant acceleration.
What is the force?

Answer:

D is the correct answer

Explanation:

solid is a new substance, and it's called a precipitate.

The precipitate formation is occurred when a solid forms out of mixing two liquids. Hence, precipitate formation is the correct option.

The given problem is based on the chemical reactions and substances formed due to the chemical reactions. The given question says that some solid substance forms out of mixing two liquid substances in a chemical reaction. Now, let us analyze the options:

Thus, we can conclude that precipitate formation is occurred when a solid forms out of mixing two liquids.

Learn more about the precipitate formation here:

https://brainly.com/question/19487269

Answer:

Explanation:

A turbine is a mechanical device that can be used for the conversion of one form of energy into another.

The boiled water generates thermal energy which is blown against a huge turbine blades. The thermal energy is converted to mechanical energy (which drives the blades of the turbine), and sound energy in the turbine. The spinning blades thereby cut the magnetic field as they rotates inducing electric current (Fleming's left hand rule), thus electrical energy is produced.

The electrical energy is now converted to light energy and heat energy by the lamp.

Answer:

0.82 J

Explanation:

We know that work done W = Fd where F = force and d = distance moved in the direction of the force.

Now, the finch on Galapagos Islands exerts a force of 205 N with its beak as it cracks open a seed case. So, F = 205 N. If the beak moves a distance of 0.40 cm during this operation, then d = 0.40 cm = 0.004 m.

We now compute W.

So, W = Fd

= 205 N × 0.004 m

= 0.82 J

So the finch does work of 0.82 J to get at the seed inside the case.

Answer:

We get mater to grow by eating food, drinking water and breathing in oxygen

Explanation:

Growing shows an increase in size or mater of a living organism over time, such that the present state of a living organism has an increased amount of matter or inertia than its previous status.

However, by the law of conservation of mater, the amount of mater in a closed system is constant, therefore, we have that for us to grow, new mater must be ingested, which comes from what we take into our bodies

Therefore, we get mater to grow by eating food, drinking water and breathing in oxygen

Answer:  don´t know

Explanation:

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The water pressure at depth h from the water surface is obtained from the following equation.

[tex]Pressure = (density) \times (gravity \: \: acceleration) \times (depth \: \: from \: \: the \: \: water \: \: surface) \\ [/tex]

[tex]density = 1000 \: \: \frac{kg}{ {m}^{3} } [/tex]

[tex]gravity \: \: acceleration = 10 \: \: \frac{m}{ {s}^{2} } [/tex]

[tex]depth \: \: from \: \: the \: \: the \: \: water \: \: surface = 30 \: \: m \\ [/tex]

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[tex]P = 1000 \times 10 \times 30[/tex]

[tex]P = 300,000 \: \: pascals[/tex]

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Answer:

Momentum = 9kgm/s

Explanation:

Given the following data;

Mass = 18kg

Velocity = 0.5m/s

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

[tex] Momentum = mass * velocity [/tex]

Substituting into the equation, we have;

Momentum = 18 * 0.5

Momentum = 9kgm/s

Therefore, the momentum of the object is 9kgm/s.

Answer:

29.4 N

Explanation:

F = ma

F = (3 kg) (9.8 m/s²)

F = 29.4 N

Answer:

100 meters

Explanation:

d=at^2 correct? So you plug in acceleration and time. d=(4)(5)^2 which when using pemdas turns out to 100 meters.

Answer:

the line b aka the option d

Explanation:

Answer:

v_{f}=21.75[m/s] (velocity just before it lands)

t = 2.98 [s]

Explanation:

The key to solving this problem is the initial velocity since when the camera falls it is moving up, we will take this velocity as negative and the acceleration gravitation down as positive.

We will use the following equation of kinematics to solve this problem.

[tex]V_{f}^{2} =V_{o}^{2}+2*g*y[/tex]

where:

Vf = final velocity [m/s²]

Vo = initial velocity = 7.5 [m/s]

g = gravity acceleration = 9.81 [m/s²]

y = elevation = 27 [m]

[tex]v_{f}^{2} = - (7.5)^{2} +(2*9.81*27)\\ v_{f}^{2} = 473.5\\v_{f}=\sqrt{473.5}\\v_{f}=21.75[m/s][/tex]

Now using the following equation of kinematics, we can calculate the time that the fall lasts.

[tex]v_{f}=v_{o}+g*t[/tex]

[tex]21.75 = -7.5 +9.81*t\\9.81*t = 29.25\\t = 2.98[s][/tex]

Answer:

Explanation:

The power of the crane can be found by using the formula

[tex] p = \frac{ \orange{w}}{ \orange{t}} \\ [/tex]

w is the workdone

t is the time taken

From the question we have

[tex]p = \frac{5600}{2.8} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

13

Explanation:

13.0120481928 it is the distance

Answer:

The speed of 1 kg ball is 3 times of the speed of 9 kg ball.

Explanation:

It is given that, 1 kg ball and 9 kg ball have the same kinetic energy.

We need to compare their speeds.

The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

Where

m is mass and v is speed

As kinetic energy is same. So,

[tex]m_1v_1^2=m_2v_2^2\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{m_2}{m_1}\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{9}{1}\\\\\dfrac{v_1}{v_2}=\dfrac{3}{1}\\\\v_1=3v_2[/tex]

So, the speed of 1 kg ball is 3 times of the speed of 9kg ball.

Answer:

lead with Z = 82 is transformed into Bismuth with Z = 73

The Po with Z = 84 becomes Pb with Z = 82

Explanation:

Beta decay occurs when a neutron emits an electron and an anti neutrino from the atomic nucleus, therefore the atomic number of the material increases by one unit.

           Pb + e + ν → Bi

lead with Z = 82 is transformed into Bismuth with Z = 73

In alpha decay, a helium nucleus is emitted from the nucleus of the atom, therefore the atomic number decreases by two units.

         Po +α → Pb

The Po with Z = 84 becomes Pb with Z = 82

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Answer: There is nothing here

Explanation: Could you please add a picture or something

1.6.86

2.59.04

3.3

Thats the answer I think

Answer:

a)  [tex]w_{Fy} = 237.61713[/tex]J

b)  [tex]w_{g}=-58.86[/tex] J

c)  [tex]N=223.44641[/tex]N

Explanation:

Key: theta = θ kinetic friction = μ α = 180°

a) Work of Force put on block

Remember that you need both sides x & y

Equations:

b) Work of Gravity on block

c) Magnitud of Normal Force

Hope it helps

Answer:

decreases with denser air

Answer:

b) decreases as altitude decreases

Explanation:

Answer:

Explanation:

The processes involved in each of the molecules involved are different.

For example, water molecules that have condensed in the atmosphere (in the cloud) return back to the earth through precipitation in the form of rain water. These cows drink these water from various water bodies around them. This is one process in which water molecules move from the atmosphere into the living cow.

In the case of carbon and nitrogen atoms; the air the cow breath in consists of nitrogen, oxygen, carbon dioxide and some other gases. These gas molecules move (from the atmosphere) into the cow through the process of respiration.

Answer:

do you have any pictures or any answers we can choose from?

Explanation:

This is an incomplete question.

Answer:

22

Explanation:

Answer:

t = 3.35 s

Explanation:

It is given that,

Mass of a pumpkin, m = 8 kg

It is dropped from a height of 55 m

We need to find the time taken by it to hit the ground.

Initial velocity of the pumpkin, u = 0

Using second equation of motion to find it as follows :

[tex]h=ut+\dfrac{1}{2}at^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2(55)}{9.8}} \\\\t=3.35\ s[/tex]

So, it will take 3.35 seconds to hit the ground.

Answer:

D

Explanation:

I might be wrong but if I was you i would go with D

Answer:

A Making cars that get better gas mileage

Explanation:

Getting cars that gets better gas mileage are increasing the efficiency of fossil fuels.