A solid steel ball is thrown directly downward, with an initial speed 7.30 m/s, from the top of a building at a height of 29.5 m. How much time in seconds does it take before the ground?
​

Answer:

M = ρ V = 9 gm/cm^ 3 * cm^3 = 27 gm

a = (V2 - V1) / t = (6 - 2) m/s / 12 s = 1/3 m/s^2     the acceleration

F = M a = 27 gm * 1/3 m/s^2 = 9 dynes      net force applied

The speed will be calculated by dividing the distance traveled by the object by the time elapsed.

Based on the information given, an overview will be given to you on how to calculate the speed of the cart.

Average speed is a scalar quantity and is gotten by dividing the distance by time taken. For example, if the distance traveled is 100km and the time taken is 4 hours. The speed will be:

= Distance/Time

= 100/4.

= 25km/h.

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Question :-

Answer :-

[tex] \rule {180pt} {2pt} [/tex]

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Radius of the Watch is 5 meter , Time is given 2 seconds . And, we have been asked to calculate the Velocity of the Watch .

For calculating the Velocity , we will use Formula :-

Therefore , by Substituting the given values in the above Formula :-

⇒ Velocity = Displacement / Time

⇒ Velocity = 5 / 2

⇒ Velocity = 2.5

Hence :-

[tex] \underline {\rule {180pt} {4pt}} [/tex]

⇒ Velocity = Displacement / Time

⇒ Velocity = 5 / 2

⇒ Velocity = 2.5

Answer:

Internal energy is all the energy contained in an object, including both kinetic energy and potential energy

Answer:

a closed polygon whose sides taken in order represent in magnitude and direction a system of forces in equilibrium.

Explanation:

Answer: a closed polygon whose sides taken in order represent in magnitude and direction a system of forces in equilibrium.

Explanation: Hope that helps.

The acceleration of one of those bugs is equal to 305mi/s.

To calculate the insect's acceleration, the action and reaction force of the impact must be considered.

As the insect will hit the helmet, the force it hits is the same force it receives, so we can make the following expression:

                                          [tex]m_m \times a_m = m_b \times a_b[/tex]

                                        [tex]550 \times 0.0027 = 5 \times 10^{-3} \times a_b[/tex]

Speed ​​has been converted to miles per second

                                          [tex]a_b = 305 mi/s[/tex]

So, the acceleration of one of those bugs is equal to 305mi/s.

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Answer:

The answer is Friction.

Hope this helps :)

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Answer:

I believe the answer is A. Contact

Explanation:

Hope that helps

Answer:

c because that's the answer

She would weigh 31 pounds more on Mars than on Pluto. Therefore option C is correct.

To calculate the differences in weight using the given information.

1. Weight on Earth: 100 pounds

Now, let's calculate the weight differences for Pluto and Mars:

2. Weight on Pluto:

Pluto's gravity is about 0.06 times that of Earth's.

Weight on Pluto = Weight on Earth × Pluto's gravity

Weight on Pluto = 100 pounds × 0.06 = 6 pounds

3. Weight on Mars:

Mars' gravity is about 0.38 times that of Earth's.

Weight on Mars = Weight on Earth × Mars' gravity

Weight on Mars = 100 pounds × 0.38 = 38 pounds

Comparing the weight differences:

Weight difference between Earth and Pluto = 100 pounds - 6 pounds = 94 pounds

Weight difference between Earth and Mars = 100 pounds - 38 pounds = 62 pounds

Therefore, the correct answer is C. She would weigh 31 pounds more on Mars than on Pluto.

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Answer:

One piece has a north pole only, and the other piece has à soutn pole only.

Explanation:

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Answer: B

Explanation:

When we split a magnet in half, both halves act as magnets, with each having a north and south pole. As with the original magnet, the matching north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must be polarized in the opposite direction.

Answer:

Closed circuit

Explanation:

See the switch is not connected with circuit.

Answer:

Explanation:

V₁ = <20, -15, 15>, V = <0, 0, 20>

V₂ = V - 2V₁ = <0, 0, 20> - <40, -30, 30> = <-40, 30, -10> = -40i + 30j - 10k

magnitude = [tex]\sqrt{40^2+30^2+10^2}}=51[/tex]

The work done by friction on the roller coaster cart during its motion up the ramp is -813 kJ

The total mechanical energy at the bottom of the tall ramp, E equals the total mechanical energy at the top of the tall ramp, E'

E = E'

U + K + W = U' + K' + W' where

So,

mgh + 1/2mv² + W = mgh' + 1/2mv'² + W' where

Substituting the values of h, W and v' into the equation, and making W' subject of the formula, we have

mgh + 1/2mv² + W = mgh' + 1/2mv'² + W'

mg(0) + 1/2mv² + 0 = mgh' + 1/2mv² + W'

0 + 1/2mv² + 0 = mgh' + 1/2mv² + W'

1/2mv² - 1/2mv² - mgh' = W'

W' = -mgh

Substituing the values of the variables into the equation, we have

W = -mgh

W = 1550 kg × 9.8 m/s² × 53.5 m

W = -812665 kgm²/s²

W = -812665 J

W = -812.665 kJ

W ≅ -813 kJ

So, the work done by friction on the roller coaster cart during its motion up the ramp is -813 kJ

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The theoretical electricity consumption is 268.179 kilowatt-hours per metric tonne.

The theoretical minimum of electricity consumption is 60.340 % of the practical minimum of electricity consumption.

The theoretical electricity consumption is equal to the sum of sensible heat ([tex]q_{s}[/tex]) and latent heat ([tex]q_{l}[/tex]) needed to melt a metric ton of steel, in kilowatt-hours per metric tonne:

[tex]q = q_{s}+q_{l}[/tex]   (1)

By definitions of sensible and latent heat, we have the following formulas:

[tex]q = c\cdot (T_{f}-T_{o}) + L_{f}[/tex]   (1)

Where:

If we know that [tex]c = 1.294\times 10^{-1}\,\frac{kWh}{ton\cdot ^{\circ}C}[/tex], [tex]T_{o} = 20\,^{\circ}C[/tex], [tex]T_{f} = 1500\,^{\circ}C[/tex] and [tex]L_{f} = 76.667\,\frac{kWh}{ton}[/tex], then the theoretical electricity consumption is:

[tex]q = \left(1.294\times 10^{-1}\,\frac{kWh}{ton\cdot ^{\circ}C} \right)\cdot (1500\,^{\circ}C-20\,^{\circ}C)+76.667\,\frac{kWh}{ton}[/tex]

[tex]q = 268.179\,\frac{kWh}{ton}[/tex]

The theoretical electricity consumption is 268.179 kilowatt-hours per metric tonne. [tex]\blacksquare[/tex]

According to the document "Theoretical Minimum Energies to Produce Steel for Selected Conditions" done by R.J. Fruehan et al. in March 2000. The practical minimum of electricity consumption for a electric arc furnace (EAF) is:

[tex]q_{real, min} = 444.444\,\frac{kWh}{ton}[/tex]

This indicator consider common energy losses throughout steel production.

The theoretical minimum of electricity consumption is 60.340 % of the practical minimum of electricity consumption. [tex]\blacksquare[/tex]

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The ratio m/q for this particle is mathematically given as

m/q=2.39*10^{-6}

Question Parameters:

After being accelerated to a speed of 1.17×105 m/s

the uniform magnetic field of strength 0.800 T and travels in a circle of radius 35.0 cm

Generally, the equation for the Centrifugal force  is mathematically given as

[tex]qvB=\frac{mv^2}{r}[/tex]

Therefore

m/q=(0.8*0.35)/(1.17*10^{5})

m/q=2.39*10^{-6}

In conclusion, the ratio m/q for this particle

m/q=2.39*10^{-6}

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Using first equation of kinematics

[tex]\\ \rm{:}\dashrightarrow v=u+at[/tex]

[tex]\\ \rm{:}\dashrightarrow v-u=at[/tex]

[tex]\\ \rm{:}\dashrightarrow 6.1-10.2=-1.77t[/tex]

[tex]\\ \rm{:}\dashrightarrow -4.1=-1.77t[/tex]

[tex]\\ \rm{:}\dashrightarrow t=2.32s[/tex]

Answer:

When a sound source moves faster than the speed of sound, a shock wave is produced as the sound waves interfere. A sonic boom is the intense sound that occurs as the shock wave moves along the ground.

More importantly, all of the energy gets concentrated into a very small distance this is called a shock wave. In this case, the observer does not hear the approaching source at all until the shock wave hits with all of the energy in the wave. For sound waves, this can cause a very loud noise, called a sonic boom.

Sonic booms produced by aircraft flying supersonic at altitudes of less than 100 feet, creating between 20 and 144 pounds overpressure, have been experienced by humans without injury. Damage to eardrums can be expected when overpres- sures reach 720 pounds

Explanation:

marke as brainliest

Answer: B

Explanation: I think its B or A but mostly B

Answer:

The enthalpy of a reaction does not depend on the reactant path taken

Explanation:

i just took the test on a pex :)

Answer:

1 mile = 1609 meters

10 miles = 16090 meters

16090m/(24.0m/s) = 670s

16090m/(30.0m/s) = 536s

Average Speed = Total distance/Elapsed time

Average Speed = [16090m(2)]/(670s+536s) = 32080m/1206s = 26.7m/s

(a) The car's average speed is less than 27.0m/s

(b) The car's average speed is 26.7m/s

Explanation:

1 mile = 1609 meters

10 miles = 16090 meters

16090m/(24.0m/s) = 670s

16090m/(30.0m/s) = 536s

Average Speed = Total distance/Elapsed time

Average Speed = [16090m(2)]/(670s+536s) = 32080m/1206s = 26.7m/s

(a) The car's average speed is less than 27.0m/s

(b) The car's average speed is 26.7m/s

The best description of a well-designed testable question is "The question is clearly stated, the question can be tested in an experiment, and the results can be measured".

This type of question is the one that focuses on facts and aims at testing a hypothesis.

Some features include:

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Answer:

b

Explanation:

Answer:

25 J

Explanation:

Using Law of Conservation of Energy

Total Energy before = Total Energy After

Potential Energy1 + Kinetic Energy1 = Potential Energy2 + Kinetic Energy2

Potential Energy1 + 0 = 0 + Kinetic Energy2

Potential Energy1 = [tex]\frac{1}{2}*m*v^{2}[/tex] =0.5*0.5*10*10= 25 J

Answer:

energy is neither created nor destroyed; it is transformed and transferred

Explanation:

energy is neither created nor destroyed; it is transformed and transferred

The momentum of the blob of clay before collision which is the same as the initial momentum of the system is 8kgm/s.

Given the data in the question;

Initial momentum of the system; [tex]P = \ ?[/tex]

Momentum is simply the product of the mass of an object and its velocity.

Its is expressed as;

[tex]P = m * v[/tex]

Where m is the mass of the object and v is its velocity.

To determine the initial momentum which is the momentum of the blob of clay before collision, we substitute our given values into the expression above.

[tex]P = m * v\\\\P = 1kg * 8m/s\\\\P = 8kg.m/s[/tex]

Therefore, the momentum of the blob of clay before collision which is the same as the initial momentum of the system is 8kgm/s.

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We can say that having a testing site such as the mars yard helps scientists to test previously theoretical knowledge in a realistic environment.

Testing sites help scientists by providing a realistic place to test knowledge that may have previously been only theoretical through performing experiments on such test sites. This is of vital importance in the detection of errors in order to achieve a successful future mission.

Therefore, we can confirm that having a testing site such as the mars yard helps scientists to test previously theoretical knowledge in a realistic environment.

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The question about colours that could be answered through scientific investigation is 'Which color bends the most to make a rainbow?'. That is option A.

A beam of white light is made up of several colours which bends or refracts away as it strikes another medium or glass.

This bending of these colours can be visualised using prism experiments.

When this experiment is carried out, it would be observed that each color has a different wavelength, and it bends differently from all other colors.

Therefore, The question about colours that could be answered through scientific investigation is 'Which color bends the most to make a rainbow?'.

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Answer:

308m/s

Explanation:

Let the final velocity, displacent, time taken and initial velocity be V, S, T and U respectively.

Given,

U=0( The bird started from rest)

T= 11s

S=28m

then,

V=U+S×T

or, V=0+11×28

or, V= 308m/s

[tex]\large{\underline{\underline{\pmb{\frak {\color {red}{Question:}}}}}}[/tex]

[tex] \sf \red{what \: is \: propagation}[/tex]

[tex]\large{\underline{\underline{\pmb{\frak {\color {blue}{Answer:}}}}}}[/tex]

Propagation is an asèxual method of reproduction. In propagation, the DNA from the parents is taken to form another organism.

[tex]\green\star[/tex]There are two types of propagation:

1. Vegetative propagation: In vegetative propagation, new plants are obtained from the parts of old plants (like stem, roots and leaves), without the help of any reproductive organs.

2. Artificial propagation: Human grow by some man made methods are called artificial propagation.

[tex] \boxed{ \frak \red{brainlysamurai}}[/tex]

Answer:

1 or 2

Explanation:

Compared to RNA and DNA backbone, protein backbone has a relatively simple chemical structure - a nitrogen atom, two carbon atoms, one or two oxygen atoms, and a few hydrogens.