pls answer the 15a answer i cant understand it​

The ball will rise back to a height equal to the initial height multiplied by the amount of kinetic energy it had before it started to ascend again (1-fraction of energy lost).

All of the ball’s kinetic energy must be dissipated when it strikes the ground. The bounce increases with potential energy, kinetic energy, and kinetic energy alone, thus the more energy that returns to the ball and gives it more power to spring back into the air, the higher the bounce.

The height from which a ball is dropped, the material of the ball (and, if it is inflated, the pressure at which it is inflated), and the material of the surface from which the ball bounces determine the height to which it will rebound.

If you are measuring the height of the ball from its bottom to the ground, the radius of the ball doesn't actually matter.

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The expression for the line spectrum of hydrogen to include lines in the ultraviolet and infrared portions of the electromagnetic spectrum was given by Johann Balmer.

It is possible to express the wavelengths of the visible hydrogen lines using a simple formula that was developed by Swiss mathematician Johann Balmer in 1885. The difference between two terms, 1/4 (written as 1/22) and the reciprocal of the square of a variable integer (1/n2), which has sequential values of 3, 4, 5, etc., yields the reciprocal wavelength (1/), which is equal to a constant (R) times the difference between the two terms.

Theodore Lyman, A.H. Pfund, F.S. Brackett, Friedrich Paschen, and Theodore Lyman are all American scientists who discovered the other four spectral line series in addition to the Balmer series. The Lyman series is in the ultraviolet, whereas the Paschen, Brackett, and Pfund series is in the infrared.

The Rydberg formula has been used to determine the wavelengths of several spectral series that have been created from the emission spectrum of atomic hydrogen. These spectral lines that have been seen are the result of electron transitions between two energy levels within an atom. The development of quantum mechanics was greatly aided by the Rydberg formula's classification of the series. In astronomical spectroscopy, the spectral series are crucial for determining redshifts and detecting the existence of hydrogen.

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The total energy of the roller coaster car at the top of the track is 392,000 J.

The total energy of the system at the base of the rollercoaster track is 392,000 J.

The velocity of the car at a height 30 m above the base is 25.53 m/s.

The velocity of the car at the base of the roller coaster track is 40.4 m/s.

The total energy of the roller coaster car at the top of the track is calculated as follows;

P.E = mgh

where;

P.E = (500 kg) x (9.8 m/s²) x (80 m)

P.E = 392,000 J

Based on the law of conservation of energy, the total energy of the rollercoaster at the top of the track is the same as that at the bottom of the track.

Thus, total energy of the system at the base of the rollercoaster track = 392,000 J.

The velocity of the car at a height 30 m above the base is calculated as follows;

v² = u² + 2gh

v² = (8)²  +  2(9.8)(30)

v² = 652

v = √652

v = 25.53 m/s

The velocity of the car at the base of the roller coaster track is calculated as follows;

v² = u² + 2gh

v² = (8)²  +  2(9.8)(80)

v² = 1632

v = √1632

v = 40.4 m/s

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The force applied by the person is 2587.5N. The energy approach is by far and away the easiest. Earlier work equals potential energy (after).

Most issues involving forces and velocities can be solved using energy formulas like Ek = EP or W = Ep or W = Ek.

Always consider using an energy formula first; they frequently work and prevent the need for many steps to solve for one thing before moving on to another. It would take a while to find a solution if you approached it the way you did since you would have to tackle several problems as you went along. You must determine the initial takeoff speed using F = ma the way you did since you would have to tackle several problems as you went along. You must determine the initial takeoff speed using F = ma before utilizing V2f=V2i + 2ad then, given that Vf is zero, get Vi. You would then factor that into the same equation using that as your takeoff speed V2f = V2i + 2ad but this time it would be Vf. Vi would be 0, therefore the answer to the equation would be "a." The energy approach is by far and away the easiest.

Earlier work equals potential energy (after)

Fd = mghF = mgh/dF = (66)(9.81)(0.8)/0.2F= 2587.5N

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The term experiment has to do with the kind of study in which the effect of a dependent variable on an independent variable is undertaken and looked into in dept.

We know that in an experiment there must be an independent variable which is being monitored and changes from time to time and there is the dependent variable which changes as the independent variable changes.

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The magnitude and direction of the total momentum of the system is 6 kg m/s to the left.

The total momentum of the system if the two carts have the same speed is 0 kgm/s

The magnitude and direction of the total momentum of the system is calculated as follows;

Pi = m1u1 + m2u2

where;

Pi = (1.5 x 6) - (1.5 x 10)

Pi = - 6 kg m/s

The total momentum of the system if the two carts have the same speed is calculated as follows;

Pf = (1.5 x 6) - (1.5 x 6)

Pf = 0 kg m/s

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The most extreme sum of weight that can hang from the conclusion of the pole is 8.66 N.

The most extreme sum of weight that can hang from the conclusion of the bar is calculated as follows.

Apply the equation for pressure utilizing Newton's moment law of movement.

Newton's moment law of movement states that the constrain experienced by a question is specifically relative to the item of the mass and speeding up of the question.

T sinθ = W

Where T is maximum tension in cable

θ is angle of inclination of cable

W is weight of cable

10 sin (60) = W

8.66 N = W

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The force exerted on the post by the roller,

The equilibrium for bracket,

∑ [tex]F_{y}[/tex] = 0

T sin 20° - 270 = 0

T = 789.43 N

[tex]T_{x}[/tex] = ( 789.43 ) cos 20°

[tex]T_{x}[/tex] = 741.82 N

[tex]T_{y}[/tex] = ( 789.43 ) sin 20°

[tex]T_{y}[/tex] = 270 N

The 270 N force and [tex]T_{y}[/tex] forms a couple

τ = ( 270 ) 0.25

τ =  67.5 N m Clockwise

∑ [tex]M_{B}[/tex] = 0

( 741.82 * 0.125 ) - 67.5 + [tex]F_{CD}[/tex] ( 0.2 ) = 0

[tex]F_{CD}[/tex] = - 126.138 N

∑ [tex]F_{y}[/tex] = 0

[tex]F_{AB}[/tex] - 126.138 - 741.82 = 0

[tex]F_{AB}[/tex] = 867.96 N

The direction of force [tex]F_{CD}[/tex] is towards left and the direction of force [tex]F_{AB}[/tex] is towards right. The force [tex]F_{CD}[/tex] is exerted by roller B and the force [tex]F_{AB}[/tex] is exerted by roller C. Rollers A and D exert no force. The force exerted by the rollers exert oppositely on the post. So the force exerted by roller C is 126.1 N and the force exerted by roller B is 867.96 N.

Therefore, the force exerted on the post by the roller,

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The baseball thrown upwards will experience change in its velocity while its acceleration will be constant.

Upward motion is a type of motion in which an object moves upwards against force of gravity.

During the upward motion of an object, its vertical velocity decreases as the object moves upwards due to opposing force of gravity. The velocity of the object eventually becomes zero when the object reaches maximum height.

As the object begins to move downwards, the velocity begins the increase and eventually become maximum before the object hits the ground.

The acceleration of the object during the upward motion is always point downwards and does not change.

Thus, we can conclude that if an object moving upwards, its velocity will change while the acceleration will not change.

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A. The kinetic energy of the box is 10.115 J

B. The work done by the spring is 7.889 J

C. The spring constant of the spring is 298.26 N/m

A. How to determine the kinetic energy

The kinetic energy of the box can be obatined as follow:

KE = ½mv²

KE = ½ × 7 × 1.7²

KE = 3.5 × 2.89

KE = 10.115 J

Thus, the kinetic energy is 10.115 J

B. How to determine the work done by the spring

W = ½Fe

W = ½ × 68.6 × 0.23

W = 7.889 J

Thus, the work done is 7.889 J

C. How to determine the spring constant

F = Ke

68.6 = K × 0.23

Divide both sides by 0.23

K = 68.6 / 0.23

K = 298.26 N/m

Thus, the spring constant is 298.26 N/m

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[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]

[tex]\qquad \tt \rightarrow \: v = 13 \:\: m/s[/tex]

____________________________________

[tex] \large \tt Solution \: : [/tex]

By third equation of motion :

[tex]\qquad \tt \rightarrow \: {v}^{2} = {u}^{2} + 2as[/tex]

[tex]\qquad \tt \rightarrow \: {v}^{2} = (3) {}^{2} + 2(2)(40) [/tex]

[tex]\qquad \tt \rightarrow \: {v}^{2} = 9 + 160[/tex]

[tex]\qquad \tt \rightarrow \: {v}^{2} = 169[/tex]

[tex]\qquad \tt \rightarrow \: v = 169[/tex]

[tex]\qquad \tt \rightarrow \: v = 13[/tex]

so, speed of the car after that time is : 13 m/s

Answered by : ❝ AǫᴜᴀWɪᴢ ❞

Answer:

1.A

2.A

3.A

4.A

5.C

6.B

Explanation:

that's

The average force exerted on the bullet by the ammunition is 1215.88N

From the question above, It is given that,

Mass of the bullet, m = 7.50 g

Initial speed of the bullet, u = 0          

Final speed of the bullet, v = 555 m/s

We need to find the force exerted on the bullet while it was traveling down the 0.950m length of the barrel of the rifle. Let:

a is the acceleration of the bullet. So,

v² - u² = 2ad

v² = 2ad

a = v²/2d

a = 555²/2*0.950

a = 162118.42m/s²

Let F be the force exerted. It is given by:

F = Ma

F = 7.5 * 10⁻³ * 162118.42

F = 1215.88N

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F = 1590.87 N

So, the constant force exerted on the bullet is 1590.87 N. Hence, this is the required solution.                                                  

(a) This is true since a circuit breaker is linked in series with the electric device in order to interrupt the circuit if the current flow exceeds a predetermined (rated) limit.

(b) False, because the circuit breaker only permits the maximum current that has been rated for it; when the circuit exceeds that limit, it is broken. There's no issue with continuous current.

(c) The earthing terminal is present.

A circuit breaker is a type of electrical switch used to guard against short circuits, overloads, and over currents that could harm an electrical circuit. Its primary purpose is to halt current flow when protective relays identify a defect.

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v ^2f-v^2i= 2a  Replace the known values,

0-16^2=2 (-4.2)S, S= 256/8.4, S= 30.4m. The maximum distance a snowboarder could travel on a 25o slope was 30.4 meters.

The snowboarder travels a distance of H=50 meters on the hill. The hill slopes at a 15 degree slant. snowboarder's horizontal distance traveled after passing a slope, S=10m Crossing a horizontal distance, there is a 25-degree rising slope.

The snowboarder's initial speed at location A is u = 0 m/s. Let v be the representation of the final velocity. G = 10m/s2 is the acceleration caused by gravity. The snowboarder's acceleration at the incline is = a = 10 sin (15 degree)

The snowboarder moved 10 meters horizontally after reaching the bottom of the hill. Before she reaches the steep slope, as depicted in the illustration, her pace is unchanged. Now, at the top of the hill, where she could go the farthest, S

Vf = 0 m/sec would be the final speed.

To calculate the furthest she could go, write the equation of motion,

v ^2f-v^2i= 2a  Replace the known values,

0-16^2=2 (-4.2)S, S= 256/8.4, S= 30.4m. The maximum distance a snowboarder could travel on a 25o slope was 30.4 meters.

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The resultant speed of the person on the cruise ship is 12.62 m/s.

The resultant speed of an object is the single speed which can effectively represent two or more speed of the object.

The magnitude of the resultant speed of the person on a cruise ship is calculated as follows;

Vr² = Va² + Vb²

where;

Substitute the value of the north speed and east speed to determine the resultant speed of the person on the ship.

Vr  =  √Va² + Vb²

Vr = √[(3.9 m/s)² + (12 m/s)² ]

Vr = 12.62 m/s

Thus, for a person on a cruise ship is doing laps on the promenade deck at a speed of 3.9 m/s to the north and the speed of the ship 12 m/s to the east, the resultant speed is 12.62 m/s.

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The complete question is below:

person on a cruise ship is doing laps on the promenade deck. On one portion of the track the person is moving north with a speed of 3.9 ms relative to the ship. The ship moves east with a speed of 12 ms relative to the water. Find the resultant speed of the person

The statement that is most likely true about the locations is that location A is farther from the equator than location B ( A )

The average temperature throughout the year is higher in location B then that of location A. The temperature is typically warmer near the equator and is typically cooler near the polar regions.

But some factors such as elevation, precipitation and ocean currents might affect the climate pattern. This change in temperature between equator and polar regions is due to the fact that equatorial regions receive more light and energy from the Sun than the polar regions.

Therefore, the statement that is most likely true about the locations is that location A is farther from the equator than location B ( A )

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Answer:

Acceleration (a) = 0.5 mp[tex]s^{2}[/tex]

Explanation:

Given,

Object starts from rest, hence the initial velocity of the object is said to be 0

Velocity in the next 8 seconds is 4.0 m/s

u = 0 m/s

v = 4 m/s

t = 8 secs

We know,

a = (v-u)/t

=> a = (4-0)/8

=> a = 4/8 = 0.5 m/[tex]s^{2}[/tex]

The electromagnetic (EM) spectrum is the set of all EM radiation types. Electromagnetic radiation includes, for instance, radio waves from a radio station and visible light from a lightbulb in your home. Energy that flows and spreads out as it does is called radiation.

The electromagnetic spectrum is the set of frequencies of electromagnetic radiation and the related photon energies and wavelengths.

The seven regions of the electromagnetic spectrum are often arranged with wavelength decreasing and energy and frequency increasing.

are a few of the common names for these energy forms.

Electromagnetic waves have a wide range of useful, everyday applications, including WiFi, cooking, kitchen appliances, eyesight, medical imaging, and cancer treatment.

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Answer:

Time interval

Explanation:

The amount of time it takes to wake up is a time interval because it has a start and stop time. For example, if someone's alarm goes off at 7AM and they fully wake up at 7:15AM, then the period from 7AM-7:15AM is a time interval.

This given statement about uniform circular motion and distance is proved.

The distance between two points is how long it is.

Okay, so the first three components of this issue include more physics and math. Um Ds equals R. D. Data was thus provided for section A. We have to track down S. Therefore, we just integrate both sides equally using R. D. data. Our data are provided. Therefore, the upon integration over our data is only R 0 Santa + 12 beta zeta squared for part B. We'll make sure S = V T. We combine these two by using the above equation as an equal. In order to allow it to reach its roots once positive, we can see that this is Justin's equation for data. The other drawback, of course, is

Standard units are 247 times zero, therefore switch to the nature radio at a negative six. Additionally, we are given the time, which is 74 minutes, or 4440 seconds. Thus, clogging everything. Injecting R 0 and data mm hmm into the formula for data. Therefore, we enter better Data. V also appears. Everything is therefore known. We may confidently conclude that the data is, hmm, 1.337 x 10-5 bright. or 2.13 x 10 to 4 revolutions, in terms of turns. Okay. We simply re-insert the figures for beta and tr zero V into the earlier formulae for omega and alpha in the last section of the problem. You can take pleasure in utilizing math, even by hand, or perhaps he

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Answer:

50    sixty watt bulbs max

Explanation:

Watts = amps * volts

               30 a * 100 v / 60 w/bulb = 50 bulbs

The gravitational force between them will change by a factor 1/9.

We need to know about gravitational force to solve this problem. The gravitational force is the force caused by two masses objects. The magnitude of gravitational force can be determined as

F = G.m1.m2 / R²

where F is the gravitational force, G is the gravitational constant (6.674 × 10¯¹¹ Nm²/kg²), m1 and m2 are the mass of the object and R is the radius.

From the question above, we know that

R2 = 3R1

By substituting the following parameters, we get

F2/F1 = G.m1.m2 / R2² / G.m1.m2 / R1²

F2/F1 = G.m1.m2 / (3R1)² / G.m1.m2 / R1²

F2/F1 = 1/9

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The homogeneity of Einstein’s mass-energy relation  E = mc² can be proved by maxwell’s equation of electromagnetism.

According to maxwell’s equation of electromagnetism, light travels at a speed (c) of 3 x [tex]10^8[/tex] m/s.

The momentum(p) of electromagnetic waves is proportional to the energy(E).

So, we can write it as

p = E / c                       -(i)

By cross multiplication

E = pc                          -(ii)

As we know

From newton’s second law, momentum (p) is the product of mass (m) and velocity (v)

p = mv                          -(iii)

since light travels with a speed (c) of 3 x 10^8 m/s

p = mc                         -(iv)

From the equations (ii) and (iv)

E / c = mc

Hence,

E = mc²

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The current if 55C of charge pass a particular point in a circuit in 5 seconds is 11A.

One kind of electrical charge carrier that moves as current are electrons. From negative to positive areas, current flows. The ampere is the SI unit used to measure electric current (A). One coulomb of electrical charge travelling over a given region in one second is referred to as an ampere of current.

Similar to how current is widely employed in relation to electronic circuits, voltage is also. Voltage is measured using volts (V). Similar to how current and current are related, voltage and the flow of electrons in a circuit are as well. Current is the flow of electrons, whereas voltage is the amount of force driving the flowing electrons.

At higher voltages, current flows more freely; at lower voltages, current is weaker.

Given,

Electrical charge = 55 C

Time = 5 secs

Therefore current = 55 / 5 A

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Average force that her hands exert on the ball while catching basketball whose mass is 600g = 29N

Given

clock t=0.1 s

ball mass m=0.6 kilogram

The previous distance traveled (measured in meters) was 1.2.

Net Force Exerted = 29N

Total Force used:

F= △P/△t

F= m△u/△t

F= m√2gd/△t

F= 0.6.√2.9.8.1.2/0.1

F= 0.6.4.849/0.1

F= 2.90/0.1

Force = 29N

What does force mean?

Power is an effect that can physically change the movement of an object. When an object with mass changes speed, it can be accelerated by a force. B. When leaving a stationary state. The obvious way to describe force is pushing or pulling. Force is a vector quantity because it has both magnitude and direction. It is calculated using Newton SI units (N). Force is represented by the letter F (formerly P).

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The question was incomplete. Check below the full question.

Your friend is catching a falling basketball after it has passed through the basket. Her hands move straight down while catching the ball. It takes about 0.10 s for the player to lower her hands to stop the ball. Assume the mass of the ball is 0.60 kg, and that the ball has fallen a vertical distance of 1.2 m before reaching the player's hand. Determine the average force that her hands exert on the ball while catching it.

Answer:

Electrical conductors

Answer:

1165 m/s   relative to ground

Explanation:

(375 + 790  ) =  1165 m/s

Jane and Jill are stubborn because they have opposite force directions.

We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as

R = F1 + F2 + ... + Fn

where R is force resultant (net force)

From the question above, we know that

F Jack = 98.3 N

F Jill = 62.5 N

F Jane = 117 N

Assume that the direction

Jack = east

Jill = north east

Jane = south east

The Force to the north direction is

F Jill y = Fjill . cos45

F Jill y = 62.5 . √2/2

F Jane y = -F Jane . cos45

F Jane y = -117 . √2/2

Jane and Jill are stubborn because they have opposite directions.

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The magnitude of the net force the people exert on the donkey is 239 N.

Net force :

[tex]F_{n}[/tex]= [tex]F_{1}+F_{2} +F_{3}[/tex]

Now finding the x and y components of the forces F2 and F3,

[tex]F_{x}[/tex] = F1 + F2cos45°+F3sin45°

[tex]F_{x}[/tex] = 98.5 + 69.3 ×√2/2 + 125 ×√2/2

[tex]F_{x}=235.9N[/tex]

[tex]F_{y}[/tex] = -F2sin45°+F3sin45°

= −69.3 ×√2/2+ 125 ×√2/2

[tex]F_{y}[/tex] =  39.4 N

Now find the magnitude

[tex]F_{n}[/tex] = √235.9^2+39.4^2 = 239 N

The magnitude of the net force the people exert on the donkey is 239 N.

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Answer:

C

Explanation:

Average velocity =  (10+30) / 2 = 20 m/s

80 m / 20 m/s = 4 seconds

It would take a truck to increase its speed from 10 m/s to 30 m/s in 2.0 s. Option D is the correct answer.

To determine how long it would take for the truck to increase its speed from 10 m/s to 30 m/s, we can use the equations of motion. Option D is the correct answer.

The first equation we will use is: v = u + at

where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.

Given:

Initial velocity, u = 10 m/s

Final velocity, v = 30 m/s

We need to find the time, t. Since the truck is accelerating uniformly, we can assume a constant acceleration. Next, we use another equation of motion: v² = u² + 2as, where s is the distance traveled.

Given:

Distance, s = 80 m

Initial velocity, u = 10 m/s

Final velocity, v = 30 m/s

Rearranging the equation, we get: s = (v² - u²) ÷ (2a)

Substituting the given values, we have: 80 = (30² - 10²) ÷ (2a)

Simplifying the equation, we find:

80 = (900 - 100) / (2a)

80 = 800 / (2a)

2a = 800 / 80

a = 10 m/s²

Now, we can go back to the first equation: v = u + at

Substituting the known values: 30 = 10 + 10t

Simplifying, we find: 10t = 20

t = 2 seconds

Therefore, it would take the truck 2.0 seconds to increase its speed from 10 m/s to 30 m/s.

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