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3 years ago

Precise measurements of earth indicate that its polar diameter is

Physics

1 answer:

Hatshy [7]3 years ago

3 0

Answer:

12713.6 km (7899.86 mi)

Explanation:

The polar diameter of Earth is slightly shorter that the equitorial diameter of the earth. The polar diameter to be precise is 12713.6 km (7899.86 mi), whereas the equitorial diameter is about 12756 Km (7926 mi). This mean that objects located along the equator are about 21 km further away from centwe of the Earth than objects located on the poles.

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Which of these convert electric energy into kinetic energy?

Anna007 [38]

Answer:

The answer is Electric Motors .

Explanation:

As Electric motors take in electrical energy in order to operate it. So it change from electrical energy to kinetic emergy.

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3 years ago

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When the only force acting on a falling object is air resistance, the object is said to be in free fall. true or false.?

Nimfa-mama [501]

When the only force acting on a falling object is air resistance, the object is said to be In free fall. TRUE

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3 years ago

A photon is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized.

Wittaler [7]

Answer:

$\lambda=3.99*10^{-7}m$

Explanation:

According to the law of conservation of energy, the energy of the absorbed photon must be equal to the binding energy of the electron plus the energy of the released electron:

$E_p=E_b+E_r\\\frac{hc}{\lambda}=\frac{13.6eV}{n^2}+\frac{m_ev^2}{2}$

1 eV is equal to $1.6*10^{-19}J$ , so:

$13.6eV*\frac{1.6*10^{-19}J}{1eV}=2.18*10^{-18}J$

Solving for $\lambda$ and replacing the given values:

$\lambda=\frac{hc}{\frac{2.18*10^{-18}J}{n^2}+\frac{m_ev^2}{2}}\\\lambda=\frac{6.63*10^{-134}J\cdot s(3*10^8\frac{m}{s})}{\frac{2.18*10^{-18}J}{3^2}+\frac{(9.11*10^{-31}kg)(7.5*10^5\frac{m}{s})^2}{2}}\\\lambda=3.99*10^{-7}m$

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3 years ago

If you use the same force to push a motorcycle as you would push a bike which one would have more acceleration and why explain u

zaharov [31]

Answer:

The bike would have more acceleration

Explanation:

Accourding to newtons first law a force is equal to its mass multiplied by its acceleration (f=ma) therefore an object with a higher mass compared to an object with a lower mass would experience less acceleration.

Eg.

F=50N

Motorbike M=200kg

F=ma

50=200 x a

50/200=a

0.25m/s/s =a

Bike M=35kg

F=ma

50=35 x a

50/35= a

1.43m/s/s=a

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Parachutes utilize maximum air ____ in order to limit the acceleration of the fall.

eduard

Answer: Resistance

Explanation:

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