PLEASE HELP!!!!

Batteries are recharged by connecting them to a power supply (i.e., another battery) of greater emf in such a way that the current flows into the positive terminal of the battery being recharged, as was shown in Example 12. This reverse current through the battery replenishes its chemicals. The current is kept fairly low so as not to overheat the battery being recharged by dissipating energy in its internal resistance. Suppose the real battery of figure 1 is rechargeable. What emf power supply should be used for a 0.75 A recharging current?

When a rocket ship accelerating in outer space runs out of fuel, it will no longer accelerate. This is because acceleration requires a force, and in the absence of fuel, there is no force to continue propelling the rocket forward.

According to Newton's First Law of Motion, an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an external force. Therefore, when the rocket ship runs out of fuel, it will continue to move at a constant velocity in the direction it was traveling at the moment the fuel was depleted. It will not slow down or stop unless acted upon by an external force, such as gravity or air resistance, if present.

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25 m will be taken to stop the car

Answer:

because it helps data to be meaningful

Explanation:

I took a test and and got 100%

The capacitance of the spherical capacitor is approximately 1.23 μF.

The capacitance of a spherical capacitor determines its ability to store electric charge for a given potential difference. To calculate the capacitance of the spherical capacitor in this scenario, we can use the formula C = Q/V, where C represents capacitance, Q is the charge, and V is the potential difference.

Given a charge of 3.40 nC and a potential difference of 210.0 V, we can substitute these values into the formula to obtain a capacitance of approximately 1.23 μF.

The presence of a vacuum between the plates of the capacitor suggests that the dielectric material is air. The capacitance of a spherical capacitor is influenced by factors such as the geometry of the plates, the separation between them, and the dielectric constant of the medium.

In this case, with the plates separated by vacuum and the inner radius of the outer shell given as 4.50 cm, we can focus on the charge and potential difference to determine the capacitance.

Capacitance is a fundamental property of capacitors and plays a crucial role in electrical circuits. It determines the amount of charge a capacitor can store per unit potential difference and influences the energy storage capacity of the device.

The capacitance of a spherical capacitor, like in this scenario, depends on various factors, including the geometry of the plates and the medium between them.

Understanding capacitance is essential in circuit design, power transmission, and energy storage applications, as it enables engineers and scientists to optimize system performance and ensure efficient operation.

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Answer:

c

Explanation:

Answer:

aye son yall think if i keep answering these questions incorrectly.. they'll find out what im doing and take my li points back?

Explanation:

The size of a wave is equivalent to half its top to valley distance, which is the solution to the question.

Briefing:

A = 1/2* distance

A = 1/2* 5.8

A = 2.9m

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Answer:

True

Explanation:

You pay back what you owe for what youve purchased

Answer: True

Explanation:

The earth absorbs 240 W/m² of energy from the sun and radiates it back to space when measured at the earth's surface.

When measured at the Earth's surface, the amount of energy that the Earth absorbs from the sun and radiates back into space is approximately 240 W/m². This value represents the net energy balance at the Earth's surface, taking into account both incoming solar radiation and outgoing thermal radiation. The Earth's surface absorbs sunlight, which provides energy for various processes such as heating the atmosphere, evaporating water, and supporting biological activity. At the same time, the Earth's surface also emits thermal radiation, primarily in the form of infrared radiation, to maintain a thermal equilibrium. The balance between incoming solar radiation and outgoing thermal radiation is essential for maintaining the Earth's climate and temperature.

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Answer:

Inertia.

Explanation:

You are moving with a speed of 1 m/s. You are carrying a tray and the ball is at rest in the tray. You stops and the ball rolls off the tray. Whenever you starts moving with a speed of 1 m/s and when ball is at rest, due to inertia of motion the ball comes in motion. But when you stops, the ball is still in motion due to its inertia.

Hence, due to inertia the ball roll off the tray.

Answer:

The formula is W=mg.

W=20×10=200.

Answer:

\(\Huge \boxed{\mathrm{200 \ N}}\)

Explanation:

\(\sf Weight \ (N)= mass \ (kg) \times acceleration \ of \ gravity \ (m/s^2)\)

\(W=mg\)

The mass of the object is 20 kg.

The acceleration of gravity is 10 m/s².

\(W=20 \times 10\)

\(W=200\)

The weight of the object is 200 N.

Answer:

25

Explanation:

I just did this

Answer:

Physical science

Explanation:

After three half-lives, 1/8 (or 0.125) of the parent isotope remains. Thus, 0.125 times the parent atoms. The daughter isotope would be equivalent to the remaining parent isotope, 0.125 times the original number of parent atoms.

After three half-lives, the parent isotope has exponentially decayed, forming the daughter isotope. Each half-life reduces the parent isotope by half and increases the daughter isotope. Three half-lives have passed, reducing the parent isotope to 1/8 of its initial level. The rock sample would have 1/8 of the parent isotope.

The daughter isotope would have accumulated during decay. After three half-lives, the daughter isotope would have reached 3/8 of the parent isotope as each half-life creates one-half of it. After three half-lives, the rock sample would have 1/8 of the parent isotope and 3/8 of the daughter.

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If you'll looking for a metal that melts at exactly 1000 degrees celcius, then Red Brass melts at exactly 1000 degrees celcius

The internal energy of the engine has increased by 8 kJ (20 kJ - 12 kJ + 5 kJ).

This increase in internal energy is due to the energy gained from the heat reservoir and the energy lost to the surroundings, which is converted into useful work.

Internal energy is a measure of the total energy within a system, taking into account the kinetic and potential energies of the particles making up the system. The change in internal energy of a system is equal to the amount of heat added to the system, minus the amount of work done by the system.

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Answer:

true true false true false

Answer:

1)true

2)true

3)false

4)false

5)true

Answer:

The total power they will consume in series is approximately 2.257 W

Explanation:

The connection arrangement of the headlight and the engine starter = Parallel to the battery

The voltage of the battery, V = 12.0 V

The power at which the headlight operates in parallel, \(P_{headlight}\) = 38 W

The power at which the kick starter operates in parallel, \(P_{kick \ starter}\) = 2.40 kW

We have;

P = V²/R

Where;

R = The resistance

V = The voltage = 12 V (The voltage is the same in parallel circuit)

For the headlight, we have;

R₁ = V²/\(P_{headlight}\)  = 12²/38 = 72/19

R₁ = 72/19 Ω

For the kick starter, we have;

R₂ = V²/\(P_{kick \ starter}\) = 12²/2.4 = 60

R₂ = 60 Ω

When the headlight and kick starter are rewired to be in series, we have;

Total resistance, R = R₁ + R₂

Therefore;

R = ((72/19) + 60) Ω = (1212/19) Ω

The current flowing, I = V/R

∴ I = 12 V/(1212/19) Ω = (19/101) A

We note that power, P = I²R

In the series connection, we have;

\(P_{headlight}\) = I² × R₁

∴ \(P_{headlight}\) = ((19/101) A)² × 72/19 Ω = 1368/10201 W ≈ 0.134 W

The power at which the headlight operates in series, \(P_{headlight, S}\) ≈ 0.134 W

\(P_{kick \ starter}\) = ((19/101) A)² × 60 Ω = 21660/10201 W ≈ 2.123 W

The power at which the kick starter operates in series, \(P_{kick \ starter, S}\) ≈ 2.123 W

The total power they will consume, \(P_{Total}\) = \(P_{headlight, S}\) + \(P_{kick \ starter, S}\)

Therefore;

\(P_{Total}\) ≈ 0.134 W + 2.123 W = 2.257 W

Answer:

59.18 kg

Explanation:

use f=ma

f= 580 N

a = 9.8 m/s 2

weigh(m) doesn't change only force(F) changes

Answer: 219.6N

Explanation:

Find the mass of this person by dividing his weight by the accelleration. Remember, F=ma

580 = m*9.8

m = 59.18kg

Then multiply the mass by the new gravitational acceleration on Mars.

59.18*3.711 = 219.6N

Answer:

a. Effort = 960 Newton

b. Mechanical advantage (M.A) = 0.625

c. Velocity ratio (V.R) = 1.67

Explanation:

Given the following data;

Conversion:

100 cm = 1 m

X cm = 0.75 m

Cross-multiplying, we have;

X = 0.75 * 100 = 75 cm

First of all, we would find the effort arm;

Effort arm = length of crow bar - length of load arm

Effort arm = 200 - 75

Effort arm = 125 cm

Next, we would determine the mechanical advantage (M.A) of the crow bar;

\( M.A = \frac {Effort \; arm}{Load \; arm} \)

Substituting the values into the formula, we have;

\( M.A = \frac {125}{200} \)

M.A = 0.625

To find the effort of the crow bar;

\( M.A = \frac {Load}{Effort} \)

Making "effort" the subject of formula, we have;

\( Effort = \frac {Load}{M.A} \)

\( Effort = \frac {600}{0.625} \)

Effort = 960 Newton

Lastly, we would determine the velocity ratio (V.R);

\( V.R = \frac {length \; of \; effort \; arm}{length \; of \; load \; arm} \)

\( V.R = \frac {125}{75} \)

V.R = 1.67

If an object is accelerated by a force of 100 N and then a second force of 100 N in the opposite direction is applied to the object, the object will continue to move at a constant velocity in the direction of the original force.

When the two forces are equal and opposite, they cancel each other out, resulting in a net force of zero on the object. This means that the object is no longer accelerating, and is instead moving at a constant velocity in the direction of the original force. This constant velocity is known as the terminal velocity of the object, and is determined by the balance of forces acting on the object.

In summary, if two forces of equal magnitude but opposite direction act on an object, the object will continue to move at a constant velocity in the direction of the original force, with a net force of zero.

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Answer:

The red car would experience the greatest acceleration.

Explanation:

Newton says that Force equals mass times acceleration or F = ma

We get a = F/m

If we want the greatest acceleration or a, mass or m must be the lowest.

The volume of a material is directly related to its temperature in that thermal expansion occurs with an increase in temperature while thermal contraction occurs with a decrease in temperature.

The effect of heat, when applied to a substance, is that it may result in thermal expansion or thermal contraction when heat is removed

Thermal expansion refers to the increase in the size of a material when heat is applied to the substance resulting in temperature increase. Thermal expansion may be an increase in volume, area, or length.

Thermal contraction refers to the decrease in the size of a material when heat is removed from the substance. Thermal expansion may be a decrease in volume, area, or length.

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The wavelength of the radiation at the beginning of the range is 5.8 × 10² -  1.86 × 10² meter.

A wave is a non-stop and repeating disturbance of a medium and a pulse is an unmarried disturbance.

Calculation:-

c=λ⋅f

λ= c/f

 = 3 × 10⁸ /  517 × 1000

 =  5.8 × 10²

λ= c/f

 = 3 × 10⁸ /  1612 × 1000

= 1.86 × 10²

Therefore, wavelength range =  5.8 × 10² -  1.86 × 10² meter.

A wave is a propagating dynamic disturbance of one or greater portions. Waves can be periodic, in which case those quantities oscillate repeatedly about an equilibrium cost at some frequency. wave, propagation of disturbances from place to vicinity in a regular and prepared way. maximum familiar are floor waves that journey on water, but sound, light, and the motion of subatomic particles all showcase wavelike houses.

A wave is a disturbance in a medium that contains strength without an internet motion of particles. it is able to take the form of elastic deformation, a variation of stress, electric or magnetic intensity, electric-powered potential, or temperature.

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Answer:

Friction prevents motion

Explanation:

The net vertical force on the caboose (C) is

∑ F[v, C] = F[n, C]  - (1.4 kg) g = 0

where F[n, C] is the magnitude of the normal force exerted by the track on the caboose; so we have

F[n, C] = (2.3 kg) g = 13.72 N

which means the coefficient of kinetic friction µ between the caboose and the track is

F[f, C] = 0.46 N = µ (13.72 N)   ⇒   µ = (0.46 N) / (13.72 N) ≈ 0.034

and presumably the coefficient is the same for the locomotive.

The net vertical force on the locomotive (L) is

∑ F[v, L] = F[n, L] - (2.3 kg) g = 0

where F[n, L] is the magnitude of the normal on the locomotive, so that

F[n, L] = (2.3 kg) g = 22.54 N

and so the locomotive is opposed by a frictional force with magnitude

F[f, L] = µ (22.54 N) ≈ 0.76 N

Taking the locomotive and caboose together, the net horizontal force on the system is

∑ F[h] ≈ - F[f, C] - F[f, L] + F[engine] = (2.3 kg + 1.4 kg) (3.1 m/s²)

Solve for F[engine] :

F[engine] ≈ (3.7 kg) (3.1 m/s²) + 0.46 N + 0.76 N ≈ 13 N