A stone is thrown vertically with a speed of 5m/s. It came back to thrower in 20sec. Calculate the maximum height it reaches​

Answer:

a. Energy = 28800000 Joules

b. Energy = 8 Kwh

c. Cost = $4

Explanation:

Given the following data;

Power = 1000 Watts

Time = 8 hours

Cost = $0.5 per KWh

Conversion:

1 hour = 60 * 60 = 3600 seconds

8 hour = 8 * 3600 = 28800 seconds

a. To find much electrical energy, in joules;

Energy = power * time

Energy = 1000 * 28800

Energy = 28800000 Joules

b. To find how much energy is that in kilowatt hours;

Energy = power * time

Energy = 1000 * 8

Energy = 8000 Watt-hour = 8000/1000 = 8 Kwh (1 Kilowatts is equal to 1000 watts).

c. To calculate the cost of using this heater;

Cost = 8 * 0.5

Cost = $4

According to the question, the velocity of ball 2 after the collision is 30 m/s.

What is velocity?
Velocity is a vector quantity that describes the rate and direction of an object's motion. It is the displacement of an object over a period of time and is usually expressed in terms of distance (meters, feet, or kilometers) divided by time (seconds). It can also be expressed as the speed of an object in a particular direction. Velocity is a key factor in describing the motion of objects, as it accounts for both the speed and direction of an object's motion. It is an important concept in physics, and it is used to calculate forces and potential energy.

From the laws of conservation of momentum, the final velocity of ball 2 can be calculated as follows:

m1u + m2v = m1v1 + m2v2

0.2 x u + 0.2 x v = 0.2 x u + 0.2 x v2

v2 = u - (6N x 0.1s)/0.2kg

v2 = u - 30 m/s

Therefore, the velocity of ball 2 after the collision is 30 m/s.

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Answer:

90 degress -> radians= π/2

30 degress -> radians= π/6

45 degrees -> radians= π/4

180 degress -> radians= π

Explanation:

To convert degrees to radians, multiply the degree by π/180 and simplify.

Answer

the answer is 6.25

Explanation:

Here, the mass of the stone (m) = 0.5 kg, velocity at which it is thrown (v) = 5 m/s, The kinetic energy of the stone (KE) =? We have, Kinetic energy of the stone (KE) = \ (\frac12mv^21) = \(\frac120.5\times5^2\) = 6.25 Joules Hence, the kinetic energy of the stone (KE) is 6.25 joules. Hope it will be helpful

Answer:

the answer is ....angle of reflection

Answer:

Explanation:

The puck slides on the ice . Coefficient of sliding friction μ = .026

Limiting frictional force = μ R

R is reaction force of the surface .

R = mg

Friction force = μ mg

deceleration = μ mg / m

= μ g

= .026 x 9.8 = .2548

= 0.26 m /s².

A diffraction grating can be a reflection grating or a transmission grating. Plane grating and concave grating are two types of gratings.

The most common type of diffraction grating are plane gratings and concave gratings although they can also be other biographies similar as convex or toroidal depending on the operation.

The advantage of a concave grating over a plane grating is its capability to produce sharp spectral lines without the aid of lenses or fresh glasses. This makes it useful in the infrared and ultraviolet regions in which these radiations would else be absorbed upon passage through a lens.

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Answer:

D: The ability to do work or cause change.

Explanation:

Energy can be defined as the ability to do work. We apply energy in basically everything we do in life, energy is needed to walk or move from one position to another, it is required to eat and do other basic things of life. The body system converts the food that is being consumed into energy, this energy can be switched from one form to another.

There are various forms of energy which include solar energy, wind energy, electrical energy, mechanical energy, kinetic energy, potential energy, etc. This form of energy can be converted from one form to another but cannot be destroyed.

Hope this helps :)

The differential equation for q in terms of t is to be derived and the initial conditions for the quantity of salt in the tank are to be specified.

We know that the rate of change of the quantity of salt in the tank is given by

dQ/dt = (rate of flow in) * (concentration in) - (rate of flow out) * (concentration out)

By the law of conservation of mass, rate of flow in = rate of flow out = 10 - 5 = 5 L/min

Also, initial quantity of salt in the tank = 1000 L * 0.01 kg/L = 10 kg

Hence, dQ/dt = 5 * 0.04 - 5 * (Q/1000)

where Q(t) is the quantity of salt in the tank at time t, measured in kg.

So, the differential equation is

dQ/dt = 0.2 - 0.005Q

with initial condition Q(0) = 10 kg.

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Answer:

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Simpler terms:

The two main forms of solar energy transformation technologies are photovoltaic (electricity) and thermal (heat).

The indexing head is mostly used for rotating the workpiece in one degree increments.

The device you are referring to is called an "indexing head" or "dividing head." It is primarily used for rotating the workpiece in one-degree increments. The indexing head is a crucial tool in various machining operations such as milling, grinding, and gear cutting. It allows precise and accurate positioning of the workpiece for performing multiple operations, ensuring uniform spacing and precise angles.

By rotating the workpiece in one-degree increments, the indexing head enables machinists to produce complex and intricate geometries with high accuracy. The dividing head is equipped with a worm gear mechanism that enables the smooth and controlled rotation of the workpiece. It also has an adjustable indexing plate with multiple holes that allow for varying degrees of rotation.

In summary, the indexing head plays a vital role in numerous machining processes by enabling precise rotation and positioning of the workpiece in one-degree increments, ensuring accurate and consistent results in creating complex geometrical shapes.

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Answer:

energy transfer electric to heat

Air Mass may be characterized as an extremely large body of air whose characteristics of temperature and moisture content at any given altitude, are fairly similar in any horizontal direction.

Precipitation may be defined as a type of process that involves any liquid or frozen water that forms in the atmosphere and falls back to the earth. It comes in many forms, like rain, sleet, and snow. It is one of the major parts of the global water cycle.

The front is the transition zone between air masses with distinctly different properties. The differences in density are most often caused by temperature differences.

Separate air masses with different humidities as well. We identify fronts by the movement of this transition zone and the properties that move over a geographical location.  This also affects the process of precipitation at a given geographical location.

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Answer:

it's D

Explanation:

Answer:

Physical Changes :- The substance in which no new substance is formed are called physical changes.

The molecular composition of the substance are totally same.

For example :- Crushing a mineral into powder.

Explanation:

When ice melts at \(0^{\circ}C\), it requires some energy in the form of heat called the latent heat of fusion.

This is the energy required to melt the ice into the water at \(0^{\circ}C\). This energy changes the state of ice from solid to liquid.

Similarly, the same amount of energy must be extracted to convert water into ice.

Although energy is provided, the temperature is not changing because that energy is used to change the state of water.

Answer:  3.4 W

Explanation:

Efficiency = (useful power out) / (total power in)

Useful power out = Efficiency x total power in

Useful power out = (.85)(4.0 W) = 3.4 W

The useful power output of the LED light is 3.4W.

Efficiency is defined as a measure of the performance and effectiveness of a system or component. The prime approach is defined as the ratio of required inputs per useful output. When the efficiency definition is based on the first law of thermodynamics, it is called energy efficiency.

The equation is used in order to represent energy which is in the form of heat or power. It can be expressed as by the formula:

Efficiency = (useful power out) / (total power in)

For the above given example,

Efficiency= 0.85

Total power input = 4.0 W

So,

Useful power out = Efficiency x total power in

Useful power out = (.85)(4.0 W) = 3.4 W

Thus, the useful power output of the LED light is 3.4W.

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Answer:

165s

Explanation:

see attachment.

Hope this helps!

The standard volume of hydrogen peroxide used with permanent hair color is typically 20 volume (6%).

The standard volume of hydrogen peroxide used with permanent hair color is typically 20 volume (6%). It is important to note that different hair color brands or formulations may offer different volumes of hydrogen peroxide options, so it is always advisable to refer to the specific instructions and recommendations provided by the hair color manufacturer.

The percentage value, in this case, 6%, indicates the weight of hydrogen peroxide present in the formulation. In a 20 volume hydrogen peroxide solution, 6% of the total weight is hydrogen peroxide, while the remaining 94% consists of other components, such as water, stabilizers, and conditioners.

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Option b. is correct.

An electron is confined in a 1-dimensional box of length L. If the length of the box is decreased to L/2, the energy levels of the electron would...decrease.

Explanation: In a 1-Dimensional box, the energy of an electron is determined by the formula: E= h²n²/8mL²Where h is Planck's constant, m is the mass of the electron, L is the length of the box, and n is the quantum number. The energy levels of the electron would decrease when the length of the box is suddenly decreased to L/2.

This happens because the energy levels depend on the length of the box and when the length is decreased, the energy levels decrease too. The formula shows that energy levels are inversely proportional to the square of the length of the box. This means that when the length is decreased to half of its original value, the energy levels decrease to a quarter of their original value. Therefore, the energy levels of the electron decrease when the length of the box is suddenly decreased to L/2.

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Answer:

water or conduct experiment requiring the water to be in liquid state. A coffee

addicted physicist stationed at a research base requires about 0.8 kg of ice for

his coffee on the hour.

a. How much heat is required to convert 0.8 kg of ice at -35 °C into steam

at 100°C?

[5]

b. Plot the temperature - energy graph for the processes in (a). [5]

C. The surface tension of water was determined in a laboratory by using

the drop weight method. 100 drops were released from a burette the

inner diameter of whose opening is 1.8 mm. The mass of the droplets

was 3.78 g.

i. Determine the surface tension of the water and, comparing it

with the tabulated value,

161

ii. Calculate the relative error of the measurements.

Answer:

the acceleration of the car is 10.8 m/s².

Explanation:

Initial velocity (u) = 0

Final velocity (v) = 108 m/s

time (t) = 10 sec

Acceleration(a) = ?

we know

a = (v-u) / t

= 108 / 10

= 10.8 m/s²

Answer:

answer

Explanation:

the law is :

a=vf-vi on t

vi=0

vf=108 m/s

t=10/s

108 - 0 on 10 = 10.8

They all search for planets by measuring properties of a star rather than of the planets themselves. ... The size of the Doppler shift that we detect depends on the tilt of a planet's orbit.

The electric field strength (in v/m) between the plates is 9.117647 X10⁵ eV/m

The electric

field strength can be calculate as follows:

The magnitude of the electric field between two parallel conducting plates is defined as:

E = ΔV

      d

where  ΔV is the potential difference between the plates and d is their separation.

Potential energy is defined as the product of the particle charge and the potential difference.

u = q ΔV

Solve ΔV and subtitute to the electric field equation:

ΔV= U/ q

E= U/qd

In this case we have a double charged ion, so q= 2e

E =    31 x10³ eV     = 911,764.7 eV/m =9.117647 X10⁵ eV/m

    (2e) (1.7 x10⁻²m)

therefore, the electric field strength (in v/m) between the plates is 9.117647 X10⁵ eV/m

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Answer:

The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2.

Explanation:

Stars form from molecular clouds through a process known as stellar formation.

These clouds, characterized by low temperatures and high densities, provide the ideal conditions for atoms to combine and form molecules. With a mass range spanning from a few solar masses to millions of solar masses, molecular clouds serve as the birthplaces of new stars. The Pleiades cluster serves as a notable example of stars that have recently formed within such a stellar nursery.

The formation of stars from molecular clouds involves several key steps. Firstly, gravitational forces acting on regions of higher density within the cloud cause them to collapse under their own gravity. As the cloud collapses, it begins to fragment into smaller, denser clumps called protostellar cores. These cores continue to collapse, and their central regions become increasingly dense and hot. At this stage, they are known as protostars.

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Answer:

D. Moving the objects closer together

Explanation:

A.P.E.X.

took the quiz

Answer:  his total speed would be 3 seconds

Explanation: because if you mulimply 10 x 3 you get 30 meaning that your answer would be 3