The energy that can be extracted from a storage battery is always less than the energy that goes into it while it is being charged. Why?​

Answer: 33.7kg

Explanation:

Using Newton's 2nd Law, the force of gravity is equal to the mass times the acceleration:
[tex]F=ma[/tex]

The force would be the weight due to the gravitational field. And the acceleration would be the one due to gravity:

[tex]330N=m(9.8m/s^2)[/tex]

[tex]m=330/9.8[/tex]

[tex]m=33.7kg[/tex]

At that time, a force F = A(t²), after 2 s, the velocity of the object in m/s will be 8 (A/M) m/sec.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Let a be acceleration of mass M

By Newton 2nd Las, Force = mass * acceleration

F = A (t²) = M * a

a = A (t²) / M

By kinematics, final velocity = initial velocity + acceleration * time

Mass is at rest at t = 0 so initial velocity

So velocity after 2 s is

= 0 + A (2²) / M * 2

= 8 (A / M) m/sec

At that time, a force F = A (t²), after 2 s, the velocity of the object in m/s will be 8 A/M m/sec.

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The velocity of the object after 2 seconds will be the result of integrating the acceleration in time. The acceleration of the object is the second derivative of position, which is the first derivative of velocity. Therefore, we can calculate the velocity of the object at any time t from the formula:

velocity = integral(acceleration)

The acceleration in this case is the force F divided by the mass M, or A(t^2)/M. Therefore, *the speed of the object after 2 seconds would be:

Where C is a constant of integration. Since the object was at rest at time t=0, its velocity will also be zero at that moment. Therefore, we can set C=0 and calculate the velocity of the object after 2 seconds:

(a) The inscriptions made in the design is possible due to friction when carving.

(b) The friction applied when you rub the crayons with the sandpaper is kinetic friction

Friction is a force that opposes two surfaces that are in contact. It limits the movement between these two surfaces.

The inscriptions made in the design is possible due to friction when carving.

There are two types of friction, static and kinetic friction. The friction applied when you rub the crayons with the sandpaper is kinetic friction because of there is movement between two surfaces.

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(a) The additional commonly available equipment you would need is stop watch.

(b) The measurement obtained with stop watch is period of oscillation. The period of oscillation can be used to determine angular speed and the angular speed is used to determine the spring constant.

(c) The frequency of oscillation of the mass is 0.8 Hz.

The value of spring constant can be determined experimentally with a mass and stop watch to record the period of oscillation.

k = ω²m

where;

With a known mass attached to the spring, the period of the oscillation can be determined using stop watch. The period of the oscillation can be used to determine the frequency and angular speed of the oscillation. The angular speed can be used to determine the spring constant, K.

ω² = K/m

ω² = 500/20

ω² = 25

ω = √25

ω = 5 rad/s

ω = 2πf

f = ω/2π

f = 5/2π

f = 0.8 Hz

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A open system that is open to its surroundings can trade both matter and energy.

Both matter and energy can be transferred between an open system and its surroundings. The stovetop example would be regarded as an open system because heat and water vapour might be lost to the atmosphere. On the other hand, a closed system can only exchange energy, not matter, with the environment.

A closed system is a type of thermodynamic system in which mass is conserved within the system's boundaries but energy can easily enter or leave the system. Depending on what is being exchanged, the interactions between the system and its environment alter.

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Answer: C

Explanation:

i just took it

Answer:

longitudinal wave

i guess

sry if its wrong

Answer:

they transfer Matter and energy

The point at which the net magnetic field will be zero, the magnetic field due to first wire must be equal and opposite in direction to the magnetic field due to the second wire.

The magnetic field between two parallel wires is determined as follows;

B = μI/2πd

where;

From the formula above we can conclude that, the point at which the net magnetic field will be zero, the magnetic field due to first wire must be equal and opposite in direction to the magnetic field due to the second wire.

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Answer:

zero

Explanation:

zero, because no displacement

Answer:

the answer is the answer

Explanation:

if you find the answer you get the answer

N₂O: Nitrous oxide

oxygen

Answer:

1.74 s

Explanation:

[tex]T=2\pi\sqrt\frac{L}{g}=2\pi\sqrt\frac{0.75}{9.81}[/tex]

T = 1.74 s

Answer:

This is because spirit has a lower boiling point when compared to water

Explanation:

spirit has a lower boiling point when compared to water which means it has the capacity to pull more heat from your hand and also it can do this very fast. This is why our hand feels colder.

Radioactivity is a nuclear phenomenon. It is the process of spontaneous emission of α (alpha particles) or β (beta particles) and γ (gamma particles ) radiations from the nucleus of atoms during their decay.

Explanation:

Answer:

radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it "wants" to give up some energy in order to shift to a more stable configuration.

Explanation:

Answer:

zero

Explanation:

The box does not move from its’ original position, so the displacement is zero, then the work done is zero.

Required items:

Electromagnet can be created by wrapping a coil of wire on top of the iron core and passing an alternating current through it with the help of power supply.

Answer:

Explanation:

Unlike permanent magnet, electromagnet require a power supply to work.  The power supply drives an electric current through coil of wire wrapped around an iron core.

Answer:

The blue motorcycle.

Explanation:

The red one, since it has more mass, meaning it is denser, would drag on less. Less mass equals more momentum, since there is less holding it down.

Answer:

Time begins, Formation of subatomic particles, Formation of Atoms, Formation of stars, Formation of Galaxies

Explanation:

At the beginning right after the big bang time starts then sub-atomic particles forms i.e. protons, neutrons from this atoms form and after that stars and galaxies form.

Answer: On Monday, XX/XX, the XXXX you presented in our weekly review were not accurate and I’m worried that this reflected poorly on our team’s credibility. This could negatively impact senior leadership’s confidence in our team’s effectiveness at a time when headcount is already being scrutinized and potentially eliminated. Next time you present XXXX, my expectation is that everything will have been double or triple-checked in advance of the meeting so that all figures are reported accurately.

Answer:

(2 - 1.95 / 2) = .05 / 2 = .025 or 2.5 %

The value found should be within ±2.5%

The precision of the measuring instruments will be 2.5%.

It should be noted that precision simply means how close a test result will be when it's repeated.

In this case, the precision of the measuring instruments will be:

= (2 - 1.95)/2.

= 0.05/2

= 2.5%

Therefore, the the precision of the measuring instruments will be 2.5%.

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Answer: Physical weathering

Explanation:

The gravitational acceleration of White dwarf compared to Sun is 13,675.86.

The gravitational acceleration of Neutron star compared to Sun is 6.79 x 10⁻²⁴.

The gravitational acceleration of Star Betelgeuse compared to Sun is 8.5 x 10¹⁰.

Mass of sun = 2 x 10³⁰ kg

Mass of white dwarf = 2.765  x 10³⁰ kg

Mass of Neutron star = 5.5 x 10¹² kg

Mass of star Betelgeuse = 2.188 x 10³¹ kg

Radius of sun = 696,340 km

Radius of white dwarf = 7000 km

Radius of Neutron star = 11 km

Radius of star Betelgeuse = 617.1 x 10⁶ km

[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{2.765 \times 10^{30}}{2\times 10^{30}} \times [\frac{696,340,000}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 13,675.86[/tex]

[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{5.5 \times 10^{12}}{2\times 10^{30}} \times [\frac{11,000}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 6.79\times 10^{-24}[/tex]

[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{2.188 \times 10^{31}}{2\times 10^{30}} \times [\frac{617.1 \times 10^9}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 8.5\times 10 ^{10}[/tex]

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Answer:

Impulse is 0.4 x 18= 7.2

Explanation:

Impulse is defined as the integral of force over the time duration. When you do the integration of Newtons second law, momentum is

[tex]\int\limits^a_b {F} \, dt =\int\limits^a_b {\frac{dp}{dt} } \, dt[/tex]

= Δp

If momentum p is defined as the integral of force per unit time, then we can take the area under the curve to find momentum, as the area under the curve can approximate the integral of the function.

Therefore, to quickly summarize, taking the maximum force, 18N , multiplied by duration of the interaction, which is 0.5s-0.1s=0.4s, will give your momentum, in the units of  kg•m/s.

Hope that helps!

Answer:

825 km/hr

Explanation:

To find the average speed, you simply have to divide the distance by the time taken.

Distance travelled = 6600 km

Time Taken: 8 hours

Average speed = 6600 ÷ 8 or 6600/8 = 825 km/hr

Your final answer would be the plane travelled at an average speed of 825 kilometres per hour.

(i) The direction of the current will be in opposite direction to the magnetic field.

(ii) The magnitude of the emf induced in the circuit is 0.359 V.

(iii) The induced current if the circular coil is 0.048 A.

b(i) The magnetic flux linkage through the coil is 1.41 x 10⁻⁴ Tm².

b(ii) The radius of the coil is r√3 m.

The direction of the current will be in opposite direction to the magnetic field.

Initial area of the coil = (πd²)/4

Initial area of the coil = (π x 0.225²)/4 = 0.0398 m²

Final area of the coil = (π x 0.072²)/4 = 0.001296 m²

[tex]emf = \frac{NB(A_1 - A_2)}{t} \\\\emf = \frac{14 \times 1.2(0.0398 - 0.001296)}{1.8} \\\\emf = 0.359 \ V[/tex]

I = emf/R

I = 0.359/7.5

I = 0.048 A

Ф = LI

Ф = 0.015 x 0.0094

Ф =  1.41 x 10⁻⁴ Tm²

[tex]L = \frac{\mu_o N^2\pi r^2}{l} \\\\r^2 = \frac{Ll}{\mu_o N^2\pi } \\\\r = \sqrt{\frac{Ll}{\mu_o N^2\pi } } \\\\r = \sqrt{\frac{0.015(l)}{4\pi\times 10^{-7} \times (420)^2 \pi } } \\\\r = 3 \sqrt{l} \ m[/tex]

where;

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#Up

The upward force is caused by floating equipments attached below in ship to make it float.

#Down

Weight or acceleration due to gravity

#Right

#Left

Force of motor to go ahead

Answer:

P

Explanation:

If the bat break it will get replaced and you will get another bat,but if u get hit with the ball it's dangerous in many ways

The heat absorbed by a persons hand is 26,359.2 J.

The quantity of heat absorbed by the persons hand is heat gained or transferred from the hot water to cold hand. This is based on the principle of conservation of energy.

The quantity of heat absorbed is calculated as follows;

Q = mcΔθ

where;

Q = 100 x 4.184 x (100 - 37)

Q = 26,359.2 J

Thus, the heat absorbed by a persons hand is 26,359.2 J.

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