a child is riding on a merry-go-around. as the speed of the merry go round is doubled, the magnitude of the centrpetal focr acting on the chuild

Using the equations of kinematics, the velocity before entering the water is 7.9 m/s.

In the case that we want to apply the principles of kinematics we have to turn to the equations of uniformly accelerated motion. Now we have;

v^2 = u^2 + 2gh

v = final velocity

u = initial velocity

h = distance

g = acceleration due to gravity

Thus, we have to obtain the final velocity which is the velocity before diving into the water.

Hence;

v^2 = ( 2.15)^2 + 2 * 9.8 * 3

v = √( 2.15)^2 + 2 * 9.8 * 3

v= √4.6 + 58.8

v = 7.9 m/s

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Answer:

the force produced between magnetic objects

Explanation:

The force is, momentum/time.

option 1

A spaceship is a machine or vehicle built to travel through space.

Spacecraft are a form of artificial satellite used for a wide range of tasks, such as communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and cargo and person transfer.

A spacecraft that is performing a sub-orbital spaceflight launches into space and then lands without gaining enough momentum or energy to complete a full orbit of the Earth. Spacecraft enter confined orbits around the Earth or other celestial bodies for orbital spaceflights.

Only humans are carried on human spacecraft either as crew or guests from launch or while in orbit (space stations).

Therefore, A spaceship is a machine or vehicle built to travel through space.

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Answer:Since pressure = force/area, the same force on a smaller area means more pressure. When you are walking on sand, the force being applied by your body is spread out over the entire surface of your foot. ... So, more pressure applied on a given area of your foot causes more pain.

Explanation:

Good Question

Answer:

C) Increasing the mass and decreasing the distance

Explanation:

Since the equation for gravitational force is Fg = (Gm₁m₂)/r² where m₁ and m₂ are the masses of the objects and r is the distance between them, increasing the masses and decreasing the distance will produce a larger Fg.

Hope this helps. I'm not great at explaining. I'm new to Brainly

Thanks

The amount the needle on the meter is deflected A. increases

This phenomenon can be explained by Faraday's law of electromagnetic induction. According to this law, when a magnetic field (created by the bar magnet) passes through a coil of wire, it induces an electric current in the wire. This induced current generates its own magnetic field, which interacts with the magnetic field of the bar magnet.

The deflection of the meter needle is a result of this induced current. When the number of coils of wire is increased, there is a greater number of wire loops for the magnetic field to pass through. This leads to a stronger induction of electric current, resulting in a larger deflection of the meter needle.

By increasing the number of coils, more magnetic flux is linked with the wire, resulting in a higher induced electromotive force (emf) and a greater current. This increased current produces a stronger magnetic field around the wire, leading to a larger deflection on the meter. Therefore, increasing the number of coils of wire enhances the magnetic field interaction, resulting in an increased deflection of the meter needle. Therefore, Option A is correct.

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Kinetic Energy is the energy that a moving object has by virtue of its motion. It is given by the formula:KE = 1/2mv²where m is the mass of the object and v is its velocity.

The mass of the roller coaster is given as 500 kg, and its velocity is 10 m/s,

The kinetic energy of the roller coaster can be calculated as follows:

\(KE = \frac{1}{2} mv²KE = \frac{1}{2} \times 500 kg x (10 m/s)²\)

\(KE = \frac{1}{2} \times 500 kg \times 100 m^2/s^2KE = 50,000 J\)

Therefore, the kinetic energy of the roller coaster is 50,000 J or 5 x 10⁴ J.

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Answer:

Explanation:

Kinetic energy of satellite = 1/2 m v²

= .5 x 1110 x 3.55²

= 6994.39 J

This energy comes from the elastic energy of  compressed spring

elastic energy = 1/2 k d² where k is elastic constant and d is compression in spring .

1/2 k d²  = 6994.39 J

kd² = 13988.77 --------------------------- (1)

force created by spring = k d

acceleration = force / mass

= k d / 1110

Given ,

k d / 1110  = 5 x g = 5 x 9.8 = 49

kd = 54390  ------------------------------------------------- ( 2 )

dividing ( 1 )  and ( 2 )

d =  13988.77 / 54390

= .25719 m

= 25.72 cm

kd = 54390

k x .25719 m = 54390

k = 211477.9 N /m

The point where the mass have the most kinetic energy is point zero (0).

option C is the correct answer.

The kinetic energy of an object is the energy possessed by the object due to its motion.

Mathematically, the formula for kinetic energy of an object is given as;

K.E = ¹/₂mv²

where;

In a simple harmonic motion, the kinetic energy of the object increases as the speed of the object increases.

At maximum displacement of an object under going simple harmonic motion, the potential energy of the object is maximum while the kinetic energy is zero.

At minimum displacement or half of the maximum displacement, the kinetic energy of the object is maximum while the potential energy of the object is zero.

(-5)-------------------0-----------------------(+5)

Kinetic energy energy of the object at the various positions;

Thus, option C is the correct answer because position zero (0) is the half or center of the two maximum displacement positions.

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The voltage supplied to the wire is 120 volts.

To calculate the voltage supplied to a wire, we can use Ohm's Law, which states that voltage (V) is equal to the product of current (I) and resistance (R). Mathematically, this relationship is expressed as V = I * R.

In this case, the wire has a resistance of 1200 Ω (ohms) and a current of 0.10 amps. We can substitute these values into the formula to find the voltage:

V = I * R

V = 0.10 A * 1200 Ω

V = 120 A * Ω

Therefore, the voltage supplied to the wire is 120 volts.

It's important to note that Ohm's Law holds true for resistors and other components in a circuit that obey Ohm's Law. In real-world scenarios, there may be other factors to consider, such as the presence of non-ohmic devices or components with varying resistance.

Additionally, in an AC (alternating current) circuit, the relationship between voltage, current, and resistance may involve complex quantities and phase differences. However, for a simple DC (direct current) circuit with a linear resistor, Ohm's Law provides an accurate relationship between voltage, current, and resistance.

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The temperature remains constant while the substance is changing state.The correct answer is option C.

When a substance undergoes a change of state, such as melting, boiling, or condensing, the temperature of the substance remains constant during the phase transition. The process of changing state requires the absorption or release of heat energy without a change in temperature.

For example, when a solid is heated, its temperature increases until it reaches the melting point. At this point, the substance starts to change from a solid to a liquid, but the temperature remains constant until all the solid has melted.
The absorbed heat energy is used to break the intermolecular forces holding the particles together, rather than increasing the kinetic energy of the particles.

Similarly, during the process of condensation or freezing, a substance releases heat energy as it changes state. This released energy is used to form intermolecular forces and convert the substance from a gas to a liquid or a liquid to a solid. The temperature remains constant until the phase transition is complete.
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Answer:It will take about 3000 years

Explanation:

After solving the equation the wave is traveling at a velocity of 3 m/s.

Velocity is a vector quantity that describes the rate at which an object changes its position. It is a measure of both the speed and the direction of an object. Velocity is typically expressed in terms of meters per second (m/s). When an object is in uniform motion, its velocity is constant, meaning that it is not changing in magnitude or direction. If an object is accelerating, its velocity is changing over time, either in magnitude, direction, or both.

The velocity of the wave can be calculated using the following equation:
Velocity = Wavelength x Frequency
In this case, the wavelength is 0.5 m and the frequency is 6 Hz (6 cycles per second). So, the velocity of the wave is:
Velocity = 0.5 m x 6 Hz = 3 m/s
This means that the wave is traveling at a velocity of 3 m/s.

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Complete Question

Index of refraction is defined as the speed of light in a vacuum divided by the speed of light in the medium. What is the index of refraction for a glass sample? Speed of light in a vacuum c = 3.0 x 108 m/s. Speed of light in the glass = 1.50 x 108 m/s.

Answer:

The  index of refraction is  \(n_g = 2\)

Explanation:

From the question we are told that

    The  speed of light in a vacuum is  \(c = 3.0 *10^{8} \ m/s\)

      The speed of the in the glass is  \(c_g = 1.50 *10^{8} \ m/s\)

From the question the index of refraction for a glass is mathematically evaluated as

        \(n_g = \frac{c}{c_g }\)

       \(n_g = \frac{3.0 *10^{8}}{1.50 *10^{8} }\)

       \(n_g = 2\)

With a 9.0 voltage battery connected with two resistors, one is 10 ohms and the other resistor is at 20 ohms the voltage drop across the battery 1 volt. Thus, option A is correct.

Given data

voltage supplied Vs= 1.5 volts

resistance R1= 1000 ohms

resistance R2= 500 ohms

The total resistance is

Rt= 1000+ 500

Rt= 1500 ohms

In series connection the current is the same for all components while the voltage divides across all components,the voltages consumed by each individual resistance is equal to the source voltage.

Therefore, With a 9.0 voltage battery connected with two resistors, one is 10 ohms and the other resistor is at 20 ohms the voltage drop across the battery 1 volt. Thus, option A is correct.

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The change in the displacement is 70 m

Recall that the displacement is obtained as the product of the velocity and time. We have the velocity at two intervals.

At v1, the displacement can be obtained from;

x1 = 0.5 * 20 = 10 m

At v2, the displacement can be obtained as;

x2 = 2 * 40 = 80 m

Now

Δx = 80 m - 10 m = 70m

Thus the change in the displacement is 70 m

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Answer:

See down

Explanation:

Airborne Testing
In order to rate the airborne sound insulation of a party element, speakers are used to generate white noise, usually at levels of around 100 decibels, in the source room. Then, using a moving microphone technique, the average sound pressure level is measured the other side of the element in question.

Answer:

1A

Explanation:

=> Current (I) = q/t

Here charge (q) = 10C and time = 10sec

=> I = 10/10 = 1A

Given that the mass of the tank is m =10000 kg.

The initial speed is

The final speed is

As the tank comes to rest.

The time is t = 1.5 s

We have to find the average net force.

The formula to calculate force is

Substituting the values, the force will be

The negative sign indicates that the tank is slowing down or decelerating.

The magnitude of the force exerted by the tank on the barrier is 46666.67 N

The charge on the 6 μF capacitor is 10.29 μC.

What is the charge of capacitor?

The charge of a capacitor is the amount of electric charge stored on its plates due to the potential difference (voltage) between them. The charge is directly proportional to the capacitance and the voltage across the capacitor, according to the formula Q = CV, where Q is the charge, C is the capacitance, and V is the voltage.

First, we can calculate the equivalent capacitance of the two capacitors connected in parallel:

\(C_{parallel}\)= C1 + C2 = 6 μF + 8 μF = 14 μF

Next, we can calculate the total equivalent capacitance of the circuit, which is the capacitance of the parallel combination in series with the 14 μF capacitor:

1/\(C_{total}\) = 1/ \(C_{parallel}\) + 1/C3

1/\(C_{total}\) = 1/14 μF + 1/14 μF

1/\(C_{total}\) = 1/7 μF

\(C_{total}\) = 7 μF

Using the formula Q = CV, we can calculate the charge on the 6 μF capacitor:

Q = C × V = 6 μF × 12 V / 7 μF = 10.29 μC

Therefore, the charge on the 6 μF capacitor is 10.29 μC.

What is capacitance?

Capacitance is the ability of a capacitor to store electric charge when a voltage is applied across its terminals. It is defined as the ratio of the electric charge stored in the capacitor to the voltage applied to it, and its unit is the farad (F). A capacitor with a high capacitance value can store more charge for a given voltage than a capacitor with a lower capacitance value.

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The change in the kinetic energy is not shown by any of the options. Option E

We know that the kinetic energy can be defined as the energy that is in motion. This implies that the kinetic energy is the energy that is possessed by a body by reason of the fact that the object is in motion.

In this case, we have been told that a  box slides with an initial speed vo on a horizontal surface with friction and eventually comes to a stop. We know that as the box is coming to a stop, the magnitude of the kinetic energy of the object is decreasing and the magnitude of the potential energy of the object is increasing.

This is because of the fact that the box is coming to rest under the action of the forces of friction that can be seen to be acting on the box as we can see in this problem.

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Missing parts;

A box started with an initial speed on the rough horizontal surface slow down because of its frictions, eventually coming out to rest. Which of the following statement is equal to the change in the kinetic energy of the box a. the momentum of the box times the distance traveled b. the momentum of the box times the time it takes for the box to stop c. the momentum of the box times its acceleration d. the mass of the box times its deceleration e. None of the above

The gravity counteracting outward pressure from burning hydrogen results in the spherical shape of stars. Hence, the gas is symmetrically dispersed around the centre  forming a shape of sphere.

Gravity is the attractive force by which earth and other spatial objects attracts objects near their surface. Stars are formed from the dust and gaseous particles. The light and heat energy of stars is generating form the nuclear fusion.

Nuclear fusion is the process of fusing light nuclei to form a massive nuclei with the release of tremendous energy. In stars the major gas is hydrogen which fuses with other hydrogen isotopes forming helium nuclei.

The gas in the majority of stars is not concentrated in the center of the star and is not dispersed throughout space. The gas is distributed symmetrically around the center and takes on the shape of a perfect sphere or something very close to one thus the equal weight of gravity acting in all directions.

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The mass of a material with density is required to make a hollow spherical shell having an inner radius of r1 and an outer radius of r2 is given as \(\frac{4\pi.p(r^3_2-r^3_1)}{3}\)

The amount of anything in relation to a unit of volume, area, or length: as. : the substance's mass in relation to its volume. grams per cubic centimeter is a unit of density.

The volume of a spherical shell can be calculated from:

V= \(V_o - V_1 = \frac{4}{3}\pi(r^3_2 - r^3_1)\)

From the definition of density, ρ = m/v

So,

m = pv = p\((\frac{4}{3} \pi)\)\((r^3_2 - r^3_1)\) = \(\frac{4\pi.p(r^3_2-r^3_1)}{3}\)

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Answer:B

Explanation: The book is thinner making magnets attraction stronger, making the paper clip harder to move

Answer:

Explanation:

According to Newton's Law of Gravitation, the gravitational force between two objects is always mutual, meaning that the force that one object exerts on the other is equal in magnitude but opposite in direction.

This means that if planet A exerts a gravitational force on planet B, then planet B will also exert a gravitational force on planet A. The magnitude of this force will be equal to the magnitude of the force that planet A exerts on planet B, but the direction will be opposite.

For example, if planet A exerts a gravitational force on planet B that is pulling planet B towards planet A, then planet B will also exert a gravitational force on planet A that is pulling planet A towards planet B. The magnitude of these two forces will be equal, but the directions will be opposite.

hat he sais

Answer:w

Explanation:

Answer:

The object has decreasing acceleration and decreasing velocity.

Answer:

Tension

Explanation:

Answer:D) tension