50 POINT PHYSICS QUESTION! PLEASE HELP!

A girl, standing on a bridge, throws a stone vertically downward with an initial velocity of 12.0 m/s, into the river below. If the stone hits the water 2.50 seconds later, what is the height of the bridge above the water?
Remember to identify all your data, write the equation, and show your work.

Answer: There is nothing here

Explanation: Could you please add a picture or something

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 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:

Energy materials are traditionally made with a linear approach—materials are taken, products are made, and when they expire or break, they are disposed of. The process repeats.

Explanation:

This may help I don't know

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:

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:

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:

the line b aka the option d

Explanation:

Answer:

D

Explanation:

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

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:  don´t know

Explanation:

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Answer:

Whats a rahul?

Explanation:

I'll edit this once I know :)

Answer: its B

Explanation: just took the quiz

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:

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:

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:

False

Explanation:

In the question it is given that a proton travels in the right moves in between the two plates. An electric field that is pointing in the vertically upward direction has magnitude of 3 N/C. The electric field is produced by the plates.

Now from here we can conclude that the direction of the force acting on the proton when the proton is in between the plates acts in the downward direction. While the electric field lines points in the upward direction. Thus the electric point will not be in the direction of the force that acts on the proton.

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

Answer:

22

Explanation:

Answer:

decreases with denser air

Answer:

b) decreases as altitude decreases

Explanation:

1.6.86

2.59.04

3.3

Thats the answer I think

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:

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:

13

Explanation:

13.0120481928 it is the distance

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.

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Answer:

29.4 N

Explanation:

F = ma

F = (3 kg) (9.8 m/s²)

F = 29.4 N

Answer:

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

Explanation:

This is an incomplete question.