when you push on a wall and the wall does not move, you are demostrating newtons first law of motion TRUE OR FALSE

The ideal mechanical advantage (IMA) of the machine is 3. The developer's claim of an actual mechanical advantage (AMA) of 4 is higher than the calculated IMA, suggesting that some energy is lost to friction. Therefore, the claim is not true.

The ideal mechanical advantage (IMA) of a machine is calculated by dividing the input distance by the output distance. In this case, the input distance is 81 meters and the output distance is 27 meters. Therefore, the IMA of the machine is 81/27 = 3.

The developer's claim of an actual mechanical advantage (AMA) of 4 is higher than the calculated IMA of 3. This suggests that some energy is lost to friction in the machine, reducing its efficiency and resulting in a lower AMA. Therefore, based on the calculated IMA, the developer's claim could not be true.

Answer:

D

Explanation:

The resistivity is a dependent factor for the ease of allowing electrons to flow. The approximate ratio of the resistivity of pure water to silver is [tex]3 \times 10^{11} :1[/tex].

The property of the material that determines the actual resistance offered by the material to the flow of current through a cross-section area, is known as the resistivity of the material.

Pure water is a bad conductor of electricity which means it offers high resistance to the flow of electric current. So, the standard value of the resistivity of pure water is around [tex]10^{3} \;\rm \Omega.m[/tex].

On the other hand, silver is one of the materials which allows higher conduction of electricity through it, hence it has a lower level of resistivity of the order [tex]1.60 \times 10^{-8} \;\rm \Omega.m[/tex]

So, the ratio of resistivity of water to the silver is,

[tex]=\dfrac{10^{3}}{ 1.6 \times 10^{-8}}\\\\\approx 3 \times10^{11} : 1[/tex]

Thus, we can conclude that the approximate ratio of the resistivity of pure water to silver is [tex]3 \times 10^{11} :1[/tex]

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The resistance of the speaker is calculated using Ohm's law and the provided values of 16 volts and 2 amps, resulting in a resistance of 8 ohms. The correct answer is d) 8 ohms.

The resistance of the speaker can be found using Ohm's law, which states that voltage (V) is equal to the current (I) times the resistance (R), or V = IR.

Since we know that the speaker draws 2 amps of current and is connected to a 16-volt source, we can rearrange Ohm's law to solve for resistance (R) as follows: R = V / I. By plugging in the given values we have R = 16 V / 2 A, which equals 8 ohms. Therefore, the resistance of the speaker is 8 ohms.

Answer:

I know this is super late but I have the answer and the screenshot

One example could be when an airplane is flying in the air the higher it is the more gravitational pull there is and if the engines are not working the airplane will come down at a faster speed. It is important to know this because this could cause lots of danger to people and everyone on the plane. 

Explanation:

And there you go have a great day!

don't forget to reword this because then that would be plagiarism so goodluck!

Answer:

Bowling ball on a shelf.

Explanation:

      Let's say you won a bowling competition and wanted to display the ball on top of a book case. After trying for a while, you finally get it to stay in place without rolling. You may think it'll stay, but that ball still has potential energy, meaning it could fall off and hurt someone.

Answer:

C.

Explanation:

edge

The nuclear binding energy of an atom that has a mass defect of  1.643×10⁻²⁸ kg is 4.93 10⁻²⁰ J . Hence option B is correct.

The binding energy is the amount of energy necessary to detach a particle from a particle system or to scatter all of the system's particles. Subatomic particles in atomic nuclei, electrons bound to nuclei in atoms, and atoms and ions linked together in crystals are all examples of binding energy.

Nuclear binding energy is the energy necessary to entirely split an atomic nucleus into its component protons and neutrons, or the energy freed by merging individual protons and neutrons into a single nucleus. The hydrogen-2 nucleus, which consists of one proton and one neutron, may be entirely separated by delivering 2.23 million electron volts (MeV) of energy. In contrast, when a neutron and a proton move slowly, When a slowly moving neutron and proton unite to produce a hydrogen-2 nucleus, 2.23 MeV of gamma radiation is released. The total mass of the bound particles is smaller than the sum of the masses of the component particles by an amount equal to the binding energy (as represented in Einstein's mass-energy equation).

In this problem,

The mass defect is Δm = 1.643×10⁻²⁸ kg

Speed of light c = 3×10⁸ m/s

Nuclear binding energy,

B.E. = Δmc²

B.E. = 1.643×10⁻²⁸ kg × 3×10⁸ m/s

B.E. =  4.929×10⁻²⁰ ≅  4.93 10⁻²⁰ J

Hence option B is correct.

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Zero on the Celsius scale is not known as absolute zero. - False

Zero on the Celsius scale is not known as absolute zero. Absolute zero is the lowest temperature that can theoretically exist, and it is equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. Zero degrees Celsius is simply the freezing point of water. At this point, all molecular motion and energy cease, and no heat remains in matter.

It is a fundamental concept in thermodynamics and the basis for the Kelvin temperature scale. Achieving absolute zero is impossible in practice, but scientists have come close, allowing the study of quantum phenomena and materials at extremely low temperatures, leading to breakthroughs in physics and technology.

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Answer:

470 J/Kg.K

Explanation:

Let c be the specific heat capacity of metal.

According to the principle of caloriemetry

Heat lost by the hot body = Heat gained by the cold body

Heat lost by the aluminium = Heat gained by metal + calorimeter

mass of Aluminium x specific heat of Aluminium x rise in temperature  + mass of water x specific heat of water x rise in temperature = mass of metal x specific heat of metal x fall in temperature

0.09 x 910 x (32 - 20)  + 0.390 x 4190 x (32 - 20) = 0.16 x c x (305 - 32)

982.8 + 19609.2 = 43.68 c

c = 471.4 J/Kg.K

c = 470 J/Kg.K (nearly)

In the electrochemical cell, electron flow from anode to cathode. for the process to continue there must be some mean to keep the charge in balance. the salt bridge maintains the neutrality of solution.the salt bridge does not let the electrons move from the electrolyte. it makes the circuit complete and hence allows the flow of current. some of the examples of salt bridge are KCL, KNO₃ etc.

Final answer:

Jody's weight on Earth is calculated by multiplying his mass (50 kg) by Earth's standard gravity (9.81 m/s^2), which equals 490.5 newtons.

Explanation:

When calculating the weight of an object on Earth, we need to account for the force of gravity acting upon the object's mass. The standard acceleration due to gravity on Earth is approximately 9.81 meters per second squared (m/s2). To find Jody's weight, we multiply his mass by the acceleration due to gravity:

Weight = Mass times Earth's gravity

Weight = 50 kg times 9.81 m/s2

Weight = 490.5 N (newtons)

Therefore, on Earth, Jody weighs 490.5 newtons.