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The time it takes the stone to fall from a height of 7.11 m is 1.2 seconds.

Time can be defined as an ongoing and continuous sequence of events that occur in succession, from past through the present, and to the future.

To calculate the time it takes the stone to drop from an height of 7.11 m, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1 and solve for t.

Hence, the time it takes the stone to fall is 1.2 seconds.

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Answer:

1. b

2. c

3. b

4. a

5. a

6. c

7. c

8. d

Since no work is done, the power exerted is zero. Therefore, the man exerts no power on the wall.

In physics, force is defined as any action that can change the motion of an object or cause an object to accelerate. Force is a vector quantity, meaning that it has both magnitude (size or strength) and direction. The unit of force in the International System of Units (SI) is the Newton (N), which is defined as the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg × 1 m/s^2). Force can be measured using a variety of instruments, such as spring scales, strain gauges, or force plates. Some common types of forces include gravitational force, electromagnetic force, frictional force, and normal force. The study of forces and their effects on the motion of objects is known as mechanics and is a fundamental concept in physics.

Here,

a. The man does not do any work on the wall because the wall does not move. Work is only done when there is a displacement in the direction of the force applied.

b. Since no work is done, no energy is used or transferred.

c. The power exerted by the man can be calculated using the formula:

Power = Work / Time

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Answer:

If two bumper cars collide with a certain force, then they will move away from each other in opposite directions with the same force. This demonstrates Newton's third law, which states that for every action, there is an equal and opposite reaction.

Explanation:

The electroscope will remain charged and continue to show the presence of an electric charge if the ground is withdrawn from the knob before the charging rod is removed.

An early scientific tool used to find electrical charge on a body is called an electroscope. The movement of a test object caused by the Coulomb electrostatic force is used to detect charge. Voltage and charge on an object are inversely correlated.

There are three traditional electroscope types: the needle electroscope, the gold-leaf electroscope, and the pith-ball electroscope (third).

electroscopes are utilized to determine whether a body has an electric charge. The movement of a test object caused by the Coulomb electrostatic force is used to detect charge. Voltage and charge on an object are inversely correlated.

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The psychoanalytic perspective states that a personality is based on the childhood experiences as well as unconscious mind.

What do you mean by psychoanalytic perspective?

In English, the terms psychoanalytic and psychoanalytical are employed. The latter phrase, which is older, originally just meant "related to the investigation of the human psyche." However, both titles evolved to refer to that as psychoanalysis became recognized as a separate therapeutic discipline. Even while both are still in use, psychoanalysis is the more common descriptor nowadays. Humans are defined as having sexual and violent urges from the perspective of a psychoanalytic lens.

Psychoanalytic theory of personality: a psychoanalytic approach that focuses on each person's unconscious thoughts, beliefs, and memories. It says that these traits affect our personalities and behaviors.

The three level of consciousness are:

Consciousness

According to Freud, every human has a conscious mind that stores all of the information they are aware of about their surroundings. Any ideas, emotions, or even easily recalled memories are all included in the conscious mind. It's all we already know and are conscious of.

Preconsciousness

The level immediately beneath aware is known as preconscious. Everything that is not in the conscious mind but may very simply be recalled and become conscious is included in the preconscious mind.

Unconsciousness

The unconscious mind is the third and last degree of consciousness. Anything that is suppressed, seems to have been forgotten, or any emotion or thought that is not conscious is what is known as the unconscious mind. This could include mistreatment or bullying of children toward their parents.

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Answer:

Explanation:

The correct option that describes a different evolutionary stage of a star like the sun is:

D) It becomes a white dwarf after exploding as a supernova

This is because a star like the sun does not have enough mass to undergo a supernova explosion. After it has exhausted all the fuel in its core, it will evolve into a red giant and then a planetary nebula, leaving behind a small, hot, dense remnant known as a white dwarf. Supernovae occur in much more massive stars that have cores that can collapse to form a neutron star or black hole.

Answer:

2 pi R / T =     speed of moon

m V^2 / R = G M m / R^2        centripetal force = gravitational force

V^2 / R = G M / R^2

4 pi^2 R^2 / (T^2 R) = G M / R^2     using first equation

R^3 = 1 / (4 pi^2) * G M T^2        we need to know G and M

R^3 = .0253 * 6.67E-11 * 5.98E24 T^2 = 1.01E13 * T^2

63.3 da = 5.47E6 sec

T^2 = 2.99E13 sec^2

R^3 = 1.01E13 * 2.99E13 = 3.02E26 = 302E24 m^3

R = 6.70E8 m from center of earth

Using 1609 m/mile

R = 416,000 miles

Note: our moon is about 239,00 miles away

So this distance is about 1.74 our earth-moon distance

If T^2 proportional R^3    (the moon period is 27.3 da)

63.3/27.3 = 2.32         2.32^2 = 5.38

416/239 = 1.74              1.74^3 = 5.27

Not exact but reasonably close

Answer:

Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it.

Explanation:

Answer:

The acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

(also, you have a typo. it's Newton, not Newtown)

Answer:

Vy = 18 sin 32 = 18 * .5 = 9.54    vertical speed

Vx = 18 cos 32 = 18 * .848 = 15.3 m/s horizontal speed

ty = Vy / 9.80 = .973 to get to top

t = 2 ty = 1.95 sec  (total time in air

Average speed up = 9.54 / 2 = 4.77 sec

Height ball rises = 4.77 * .973 = 4.64 m

Or H = Vy t - 1/2 g t^2

H = 9.54 * .973 - 4.9 * .973^2 = 4.64 m   as found above

D = Vx t = 15.3 *  1.95 = 29.8 m       for distance traveled

Answer:

New acceleration = 1.5 m/s²

Explanation:

The acceleration of an object when it moves in a circular path is given by :

\(a=\dfrac{v^2}{r}\)

Where

v is speed of an object

r is radius of path

If v remains constant,

\(a\propto \dfrac{1}{r}\)

or

\(\dfrac{a_1}{a_2}=\dfrac{r_2}{r_1}\)

Put r₁ = 5 m, a₁ = 3m/s², r₂ = 10 m

\(a_2=\dfrac{a_1r_1}{r_2}\\\\a_2=\dfrac{3\times 5}{10}\\\\a_2=1.5\ m/s^2\)

Hence, if the radius of its path is increased to 10 m, its acceleration will be 1.5 m/s².

Energy in 1 is Chemical energy, 2 is Thermal energy, 3 is electrical energy the correct answer is option B that is, Chemical, thermal and electrical energy.

Energy is the ability to do work.

The conservation of energy state that energy can neither be created nor be distroyed but can be transformed from one form to the other.

According to the question,

CASE 1

The furnance makes use of burning coal to process water to steam in a boiler. The energy involved is Chemical energy.

CASE 2

The steam produce by the boiler is used to power the rotation of the turbine. The energy involved is Thermal energy.

CASE 3

The rotation of the turbine helps the generator to produce electricity. The  energy involved is electrical energy.

Therefore, the correct answer is option B that is, Chemical, thermal and electrical energy.

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The cost of operation for an A.C for 10 hours per day for a month will be 71,100 francs.

Power is the amount of energy transferred or converted per unit time. The unit of power is the watt, equal to one joule per second. Power is a scalar quantity.

Cost of operation for 10 hours a day;

Daily consumption = 3kW x 10 hours

Daily Consumption = 30kW

Since 1kWH = 79 francs;

Daily consumption amount = 30 x 79 francs

Daily consumption amount = 2,370 francs

Therefore, the monthly consumption (using 30days) will be;

2,370 francs x 30 = 71,100 francs

In conclusion, 71,100 francs will be spent in a month (30 days) to run the 3kW rated A.C for 10 hours a day at 1kWH.

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The temperature when the mercury level is 6.5 cm above the lower mark is 26 °C.

To determine the temperature from the mercury level on a centigrade thermometer, you need to use the formula:

Temperature = (Mercury level / Distance between fixed points) * 100

In this case, the distance between the fixed points is 25cm, and the mercury level is 6.5 cm above the lower mark. Plugging these values into the formula gives:

Temperature = (6.5 cm / 25 cm) * 100 = 26 °C

So the temperature is 26 °C when the mercury level is 6.5 cm above the lower mark on a centigrade thermometer with fixed points 25 cm apart.

Answer:

1.92

2.61

Explanation:

The average time taken by the car to cover a distance of 0.25 meters and 0.50 meters which is based on the three trial times are :

Distance of 0.25 meters = 2.23 seconds

Distance of 0.50 meters = 3.13 seconds

Distance is defined as a numerical or sometimes a qualitative measure of how far objects or points are. Distance can be described as a physical length or as an approximation based on other criteria.

It can be calculated by:

Distance= Speed x time

Where, Distance is in Meter or kilometer

Speed is in meter per second or km/min

Time is in seconds or minutes

From the above formula, we can also calculate the time like for above given information,

Average travel time to cover 0.25 meters :

(Trial 1 time + Trial 2 time + Trial 3 time) ÷ 3

(2.24 + 2.21 + 2.23) ÷ 3

(6.68 ÷ 3) = 2.226667 = 2.23 seconds

Average travel time to cover 0.50 meters :

(Trial 1 time + Trial 2 time + Trial 3 time) ÷ 3

(3.16 + 3.08 + 3.15) ÷ 3

9.39 ÷ 3 = 3.13 seconds

Thus, the average time taken to cover 0.25 and 0.50 meters are 2.23 and 3.13 seconds respectively

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A controlled procedure that tests the effect of one variable on another is known as experiment.

An experiment is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena.

An experiment generally tests how one variable is affected by another.

Thus, a controlled procedure that tests the effect of one variable on another is known as experiment.

The correct answer is option B. "experiment"

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Answer:

The experiment.

Answer:

45.5 m

Explanation:

m = 2 kg, h = 20 m, E = 500 J, radius of earth = R, mass of earth = M

find the new height H

at h, the potential energy = -GMm/(R + h)

at H, the potential energy = -GMm/(R + H)

increase of the potential energy

= [-GMm/(R + H)] - [-GMm(R + h)]

= GMm[1/(R + h) - 1/(R + H)] = E

1/(R + h) - 1/(R + H) = E/(GMm)

(H - h)/[(R + H)(R + h)] = E/(GMm)

R + h ≈ R, R + H ≈ R

so (H - h)/R² = E/(GMm)

H - h = ER²/(GMm)

note GM/R² = g = 9.81 m/s²

so H - h = E/(mg)

H = h + E/(mg) = 20 + 500/(2*9.81) = 45.5 m

Answer:

Both springs and rubber bands store potential energy, and the energy turns into kinetic energy when that energy is released.

Explanation:

Answer:

Advantage: it could get rid of some unwanted waste. Disadvantage: it would emit pollution into the air.

a)A spherical convex mirror form the image at image distance is 8.57cm.

b) Mirror forms the image of height is 12.855 cm.

c)The magnification of the spherical convex lens is 0.4285.

The mirror which is a part of sphere with radius R is painted from inside forms the convex mirror.

The focal length of convex lens,  f = R/2

Given , the radius of mirror is R =30cm, the focal length will be

f =30cm/2 = 15cm

a) Object distance u =20 cm, object height =0.30m, then the image distance will be 1/f = 1/u + 1/v where v is the image distance from the lens.

1/15 = 1/20 + 1/v

v= 8.57 cm

Thus, the image distance is 8.57cm.

b) Ratio of image distance to the object distance is equal to the ratio of image height to the object height.

Substitute the values into the expression, we get the image height as

h(image) = 8.57/20 x 30

h(image) = 12.855 cm

Thus, the image height is 12.855 cm.

c) The magnification is the ratio of image height to the object height.

Putting the values, we have

= 12.855/30

= 0.4285

Thus, the magnification is 0.4285.

d) Size of object is large as compared to the size of image. Object distance is small as compared to the image distance. The image formed is virtual.

e)  The setup drawing is attached.

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Answer:

a) The type of charge distribution inside the surface is a negatively charged plane parallel to the end faces of the cylinder.

b) the net electric flux is  -821.09 N.m²/c

c) the net charge inside the cylinder is -7.2666 nC

Explanation:

Given the data in the question;

a) (a) What type of charge distribution is inside the surface?

Based on the Image of the question below;

The type of charge distribution inside the surface is a negatively charged plane parallel to the end faces of the cylinder.

b) If the radius of the cylinder is 0.66 m and the magnitude of the electric field is 300 N/C, what is the net electric flux through the closed surface?

we know that; Electric flux is;

∅ = -2 × E × Area

we substitute

∅ = -2 × 300 × π ( 0.66 m )²

= -821.09 N.m²/c

Therefore; the net electric flux is  -821.09 N.m²/c

c) What is the net charge inside the cylinder? nC

from Gause's law;

∅ = q/∈₀

q = ∅ ∈₀

we know permittivity ∈₀ = 8.85 × 10⁻¹²)

we substitute

q = -821.09 N.m²/c  × (8.85 × 10⁻¹²)

q =  -7.2666 × 10⁻⁹ C

q = -7.2666 nC

Therefore, the net charge inside the cylinder is -7.2666 nC

Explanation:

\(thank \: you\)

Answer:

1.60217662 × 10(-19) coulombs

The angle between vector A and B is 90 degrees.

Let’s consider the vectors A and B with equal magnitudes of 5.

Thus, we can assume that the angle between A and B is θ.

Now, if the sum of A and B is vector 6j, then we can write the vector equation below:

\(A + B = 6j\)

Let's first express vector A and B in terms of their components.

Let’s assume that vector A has components Ax and Ay, while vector B has components Bx and By.

Thus, the vector equation above can be rewritten in terms of components below:

\(Ax + Bx = 0\)       ------------(1)

\(Ay + By = 6\)       ------------(2)

We know that the magnitudes of vectors A and B are equal to 5, thus we can write the following equations:

\(x^2+y^2 = 5^2\)       ------------(3)

\(x^2+y^2 = 25\)      ------------(4)

From equation (4), we can write:

\(y = \sqrt{(25-x^2)}\)      ------------(5)

By substituting equation (5) into equation (2), we have:

\(Ay + By = 6Ay + \sqrt{(25-x^2)} = 6Ay\)

\(= 6 - \sqrt{(25-x^2)}\)    ------------(6)

We can now substitute equation (6) into equation (3):

\(x^2 + (6-\sqrt{(25-x^2)})^2 = 25\)

Solving for x:

\(2x^2 + 12\sqrt{(25-x^2)} = 0x^2 + 6\sqrt{(25-x^2)}\)

\(= 0x^4 + 36x^2 - 225\)

\(= 0x^2\)

\(= 3, -15\)

We choose \(x^2 = 3\) since it is positive and obtain:

\(y = 4By\)

substituting x and y into the original equations \(A = Ax + Ay\) and

\(B = Bx + By\), we obtain:

\(A = (-\sqrt{3}, 6-\sqrt{3})\)

\(B = (\sqrt{3}, -1+\sqrt{3})\)

Thus, the dot product of vectors A and B can be expressed as:

\(A \cdot B = |A||B| cos(\theta)\)

Now, we know that

\(|A| = |B| = 5\)

thus we can write:

\(A \cdot B = 25 cos(\theta)\)

Using the formula above, we can obtain the angle θ between vectors A and B as follows:

\(cos(\theta) = \frac{(A \cdot B)}{|A||B|}\)

\(cos(\theta) = \frac{[(\sqrt{3}(-\sqrt{3}) + (6-\sqrt{3})(-1+\sqrt{3})] }{(5)(5)}\)

\(cos(\theta) = \frac{ [-3 + 3]}{25}\)

\(cos(\theta) = 0\)

\(\theta= cos^{-1}(0)\)

\(\theta =90^{\circ}\)

Therefore, the angle between vector A and B is 90 degrees.

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\(\\ \sf\Rrightarrow T=F\)

\(\\ \sf\Rrightarrow T=ma\)

\(\\ \sf\Rrightarrow T=100(2)\)

\(\\ \sf\Rrightarrow T=200N\)

Answer:

A person walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of kinetic energy at work.

Explanation:

Walking and running. Cycling. In a windmill, when the moving air hits the blades, it causes rotation which ultimately leads to the generation of electricity. In a hydropower plant, when the kinetic energy of the moving water hits the turbine the kinetic energy of the water gets converted to mechanical energy.

Answer:

B = ρ g V_liquid

the thrust is proportional to the density of the liquid

Explanation:

The density of a liquid is defined as the relationship between the mass and the volume of the liquid

         ρ = m / V

The upward push of the liquid is given by the principle of Archimedes Archimedes establishes that the push is equal to the weight of the dislodged liquid

        B = W_liquid

        B = m _liquid g

we substitute mass for density

        B = ρ g V_liquid

therefore we see that the thrust is proportional to the density of the liquid

\(\\ \sf\Rrightarrow Distance=Speed\times Time\)

\(\\ \sf\Rrightarrow Distance=12(3)\)

\(\\ \sf\Rrightarrow Distance=36km\)