An egg of mass 0.060 kg is dropped from the top of a building. Just before it reaches the ground, it has a total kinetic energy of 5.9 J. What is the velocity of the egg just before it strikes the ground?

Answer:

Find answers below.

Explanation:

Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, velocity is given by the equation;

\(Velocity = \frac{distance}{time}\)

Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.

Mathematically, speed is given by the formula;

\(Speed = \frac{distance}{time}\)

1. Speed: Jackson ran 5k in 24 minutes.

2. Velocity: A storm is travelling 25 km/hour eastward.

3. Speed: John walked 420 m in 17.5 seconds.

4. Velocity: Zart moved the desk 34 cm to the left.

5. Speed: A hurricane travels 360 km in 15 hours.

6. Speed: Meredith runs 400 meters in 50 seconds.

7. Velocity: Stephen Jay swims 110 m towards the shore in 72 seconds.

8. Velocity: Vince throws a baseball 38 m from third base to first base in 1.7 seconds.

The work done by the horizontal force is found to be 60J and the work done by the gravity and the normal force is 0J.

The horizontal force that is applied is 20N and the mass of the box is 5.0 Kg and the force moves the box with a constant speed till a distance of 3.0m.

Now, first understand the work and force relation,

W= Fs.cosA, where, W is work, F is applied force, A is the angle between force and distance s.

For (a) and (b),

The work done by the gravity and the normal force on the block will be ) J because the angle A = 90 degrees.

(c). The work done by the horizontal force is given by the above formula by putting all the values, The value of the angle A is 0 degrees and the value of cos(0) = 1.

W = (20)(3)

W = 60J

So, the work done by the horizontal force is 60J.

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Answer:

Periodic motion is a repetitious oscillation.

Explanation:

The time for one oscillation is the period T. The number of oscillations per unit time is the frequency f. These quantities are related by f=1T f = 1 T .

The answer to the given question is option D - electrical conductance.

The relative ability of an electrical charge to migrate from one point to another is the electrical conductance.What is electrical conductance?Electrical conductance is a measure of how easy it is for an electrical charge to flow through a conductor when an electrical potential difference (voltage) is applied between the two points of the conductor.

The conductance is the reciprocal of the resistance, which is a measure of the opposition to current flow.What is electrical potential? Electric potential, also known as electric potential difference or electric potential drop, is a physical quantity that indicates the quantity of energy per unit charge that is supplied to a charged particle, such as an electron, to transport it from one point to another. It is measured in joules per coulomb, or volts (V).What is electrical voltage?Voltage, also known as electric potential difference, electric pressure, or electric tension, is the difference in electric potential between two points.

Voltage is a measure of the energy per unit charge that an electrical circuit can deliver to an electrical charge as it moves between the two points.What is electrical equilibrium?The state of equilibrium is attained when the net charge and the voltage potential across the cell membrane are equal and opposite. This means that there are no electrical forces driving the ions through the membrane. In other words, the concentration gradient and the electrical gradient are balanced. Therefore, the answer to the given question is option D - electrical conductance.

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When a ball hits a boundary line in cricket, it is considered in if it does not touch the ground before hitting the boundary line. In tennis, a ball hitting the boundary line is considered in and the point is awarded to the player who hit the ball.

When a ball hits a boundary line in sports such as cricket or tennis, whether it is considered in or out depends on the specific rules of the sport.

In cricket, if the ball hits the boundary line without touching the ground, it is considered a boundary and the batting team is awarded runs. This means that the ball has crossed the boundary and is considered in.

However, if the ball touches the ground before hitting the boundary line, it is not considered a boundary. In this case, the ball is considered out and no runs are awarded to the batting team.

In tennis, if the ball hits the boundary line, it is considered in and the point is awarded to the player who hit the ball. This means that the ball is still in play and the player continues to score points.

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Answer:

3

Explanation:

I had this question before

Mass is conserved in a reaction if the of the initial reactant masses equals the of the masses of products

The law of conservation of mass is a fundamental principle in chemistry that states that the total mass of a closed system remains constant during a chemical reaction. This means that the mass of the reactants before a chemical reaction is equal to the mass of the products after the reaction.

The mass of the reactants before the reaction is equal to the mass of the products after the reaction. This confirms that the law of conservation of mass holds true for this chemical reaction.

This principle is essential in chemistry as it allows us to make predictions about the outcome of a reaction based on the starting materials. It also helps to ensure the accuracy of experimental measurements, as any discrepancy between the expected and observed masses can indicate an error in the experiment.

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(a) The effort required to push the block up the slope is 3600 N.

(b) the ideal mechanical advantage of the slope is 2.92

(c) The efficiency of the slope is 68.5%.

a) To calculate the effort required to push the block up the slope, we can use the formula:

Effort = Load / AMA

where;

Load = 7200 N

AMA = 2

Effort = 7200 N / 2

Effort = 3600 N

b) The ideal mechanical advantage (IMA) of an inclined plane is given by the formula:

IMA = Length of slope / Height of slope

Length of slope = 100 m

Angle of slope = 20°

We can use trigonometry to find the height of the slope:

Height of slope = Length of slope x sin(angle of slope)

Height of slope = 100 m x sin(20°)

Height of slope = 34.2 m (rounded to one decimal place)

Therefore, the ideal mechanical advantage of the slope is:

IMA = 100 m / 34.2 m

IMA = 2.92 (rounded to two decimal places)

c) The efficiency of the slope is given by the formula:

Efficiency = AMA / IMA x 100%

AMA = 2

IMA = 2.92

Efficiency = 2 / 2.92 x 100%

Efficiency = 68.5% (rounded to one decimal place)

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Answer:

ELECTRONICS

Explanation:

Answer:

Technological

Explanation:

Answer:

25J

Explanation:

Given parameters:

Weight of a box  = 50N

Height  = 0.5m

Unknown:

Work done  = ?

Solution:

Work done is the product of the force applied to move a load through a distance.

 So;

    Work done  = weight x height  = 50 x 0.5  = 25J

Answer:

vf = 7 m/s

Explanation:

The final velocity of the ball right before it hits the ground can be found by using the third equation of motion:

\(2gh = v_f^2 - v_i^2\)

where,

g = acceleration due to gravity = 9.81 m/s²

h = height = 2.5 m

vf = final velocity = ?

vi = initial velocity =  0 m/s

Therefore,

\(2(9.81\ m/s^2)(2.5\ m) = v_f^2 - (0\ m/s)^2\\v_f = \sqrt{49.05\ m^2/s^2}\\\)

vf = 7 m/s

The speed with which the car crosses the finish line is 6.26 m/s.

Apply the principle of conservation of energy and determine the speed of the ball.

K.E (bottom) = P.E (top)

¹/₂mv² = mgh

v² = 2gh

v = √2gh

where;

v = √(2 x 9.8 x 2)

v = 6.26 m/s

Thus, the speed with which the car crosses the finish line is 6.26 m/s.

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Conduction is not an important process of energy transport inside the Sun. So the correct answer is option C.

The high temperature and density of the solar interior cause it to behave like a plasma, a state of matter in which electrons are stripped from atoms, resulting in a highly conductive fluid. Convection and radiation are the primary means by which energy is transported from the core of the Sun to its surface. Convection involves the transfer of heat through the motion of fluid, while radiation involves the transfer of energy through electromagnetic waves. The convective zone is the outermost layer of the solar interior, and it plays a crucial role in the transport of energy. Hence option C is correct.

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Answer:

Meaning of Matter

Explanation:

Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena. The three most familiar forms, or states, of matter are solid, liquid, and gas. Heating and cooling a substance may change it from one state to another.

Answer:

f=ma

mass of box =7kg

Explanation:

Answer:

Identify the formula to calculate velocity.

Explanation:

Sorry I have no explanation.

:(

But hope this helps!!!

The total (PE+ KE) before an event is equal to the total (PE+ KE) after the event.

Hence, the correct option is C.

If the total (PE + KE) before an event is equal to the total (PE + KE) after the event, this means that the total energy of the system is conserved. This is known as the principle of conservation of energy.

It is not necessary for the potential energy to remain constant or for the potential energy before the event to equal the kinetic energy before the event. Rather, the total energy (the sum of potential and kinetic energy) of the system must be conserved.

Similarly, it is not necessary for the momentum to remain constant in this case. The conservation of momentum is a separate principle that applies when there are no external forces acting on the system.

Hence, the correct option is C.

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Collapsing of spinning cloud of gas is the explanation of the solar system best fits the observations of the planets and how they orbit .

The sun and planets formed from a collapsing spinning cloud of gas and dust.

The Sun and the planets formed 4.6 billion years ago from a cloud of gas and dust called the solar nebula. Cloud of gas and dust begins to collapse because the gravitational forces . A shock wave have initiated the collapse of the solar nebula . Due to this , sun formed at the center and planets formed which starts revolving in specific orbits around the sun.

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Answer:

one watt power is defined as power produced when one joule of work is done in one second.

hope it helps

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The voltage of the source is 12 Volts or 12 Joules per Coulomb.

The difference in electric potential between two points is known as voltage or electric potential difference.

In a static electric field, this difference is defined as the amount of work per unit of charge required to move a test charge between the two points.

Work per unit charge is expressed in SI units as joules per coulomb, with 1 volt equaling 1 joule of work per 1 coulomb of charge.

The voltage or potential difference between two points in a system can be measured using a voltmeter. 

Given in the question

Energy provided = 12 J

Charge = 1 Coulomb  

We know Voltage = (Energy or Work done)/(Charge)

Put in the value, we get

Voltage = 12/1 Volt or J/C

Voltage = 12 Volt

Hence, the voltage of the source is 12 Volts or 12 Joules per Coulomb.

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The principle or law that states "an induced emf in a circuit loop produces a current whose magnetic field opposes further change of magnetic flux" is credited to Lenz. The correct option is b.

The principle described in the question is known as Lenz's law, named after the Russian physicist Heinrich Lenz. Lenz's law is a fundamental law in electromagnetism that relates to electromagnetic induction.

According to Lenz's law, when there is a change in magnetic flux through a circuit loop, an induced electromotive force (emf) is produced in the loop. This induced emf generates a current that creates a magnetic field that opposes the change in the magnetic flux.

In simpler terms, the induced current in a circuit loop always acts in a way that opposes the cause that produces it.

Lenz's law is based on the conservation of energy and is a consequence of Faraday's law of electromagnetic induction.

It provides a fundamental understanding of the relationship between magnetic fields, electric currents, and changes in magnetic flux, and it has important applications in various areas of electromagnetism, including the design and operation of electric generators, transformers, and other electromagnetic devices. The correct option is b.

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the principle or law that says" an induced emf in a circuit loop produces a current whose magnetic field opposes further change of magnetic flux" is credited to

a. Faraday.

b. Lenz.

c. Ampere.

d. Volta.

Answer:

Because the ball is dropped, we are going to assume its initial velocity is 0. With that said, acceleration is essentially the change in the velocity versus the change in time, hence the unit m/s^2, which can be thought of as “meters per second per second.” The only force acting on the ball is gravity.

That being said, you can simply divide the change in velocity by the change in time, giving you an answer of 9.8 m/s^2, which is the value of g. Even if they did not give you a time, the answer would still always be the value of g (that is if the question pertains to earth), as acceleration due to gravity is a constant.

Explanation:

Please mark brainliest

Answer:

36 mph.

Explanation:

Now Albert here is using the wind to his advantage but if say there was no wind then he would not have the 6 mph behind him so we subtract 6 from 40 to get 36. hope this helps :)

Answer: c and a

Explanation:

Answer:

electromagnetic waves can travel through a vacuum where as mechanical waves have to have a medium to travel

Explanation:

The length of brass rod after expansion is 2.0036m.

By definition, the length increase is:

Delta L = Alpha L_0 Delta TΔL=αL

naΔT

where alpha = 18 times 10^{-6}K^{-1}α=18×10−6

K-1

is expansion, L0 = 2 ml

na=2m is the initial length and Delta T = 100KΔT=100K is the temperature change. How to get:

Delta L = 18 times 10^{-6}cdot 2cdot 100 = 3.6 times 10^{-3} = 0.0036mΔL=18×10

−6

⋅2⋅100=3.6×10

−3

= 0.0036 meters

So the final length is:

L = L0 + delta L = 2 m + 0.0036 m = 2.0036 ml = l

0

na

+ΔL=2m+0.0036m=2.0036m

Linear expansion is the rate of increase in length of a solid sample per unit rise in temperature. If the length of the sample increases from l1 to l2 as the temperature increases by θ°, the expansion (α) is given by

l2 = l1(1 + αθ). This relationship assumes that α is independent of temperature.

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Answer:

A is Spring

B is Winter

C is Fall

D is Summer

Explanation:

Explanation:

A diode is an electrical element which offers the flow of current freely in one direction with very less resistance.

The given figure depicts a diode in forward bias, where the p-side and the n-side of the diode are connected to positive and negative terminals respectively. In such a case the current flows from the p-side to n-side of the p-n junction very easily and the value of the current increases rapidly after a certain voltage, this voltage is called threshold voltage.

We can deduce from the graph that the resistance of the diode reduces with increase in voltage. As resistance is given by the formula:

\(R=\frac{V}{i}\)