80123.00 in scientific notation then rounded up to 3 sig figs

Answers

Answer 1

Answer: not exactly sure what the last part of the question is but in regular scientific notation it would be " 8.0123x10 (to the 4th power)"

there wasnt a sign for the exponent lol

Answer: I know when it comes to magnetic objects the magnet always pulls not push.

Answer:

i believe it is gravity

Explanation:

the gravitational force is a force that attracts any two objects with mass. it pulls things together does not pushes them.

What is nonexample of distance

Answers

a non example of distance is capacity , volume , temperature , time , weight , power , velocity , energy , pressure , and angle

Final answer:

A nonexample of distance refers to statements or information that do not provide quantitative information about the length between two points.

Explanation:

A nonexample of distance would be something that does not involve measuring the length between two points. For example, when talking about the distance between two cities, saying 'I like the weather there' would be a nonexample because it does not provide any quantitative information about the distance. Similarly, if we are measuring the distance a car travels, saying 'It is a red car' would also be a nonexample as it does not relate to the measurement of distance.

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the maximum characteristic x-ray photon energy comes from the capture of a free electron into a k shell vacancy. what is this photon energy in kev for polonium assuming the free electron has no initial kinetic energy?

Answers

The photon energy is 75 keV (kilo-electron volts) for polonium, assuming the free electron has no initial kinetic energy.

The maximum characteristic x-ray photon energy from the capture of a free electron into a K-shell vacancy is equal to the difference in binding energies between the K-shell and L-shell in the atom.

For polonium (Po), the atomic number is 84, which means it has 84 electrons. The K-shell of polonium is filled with 2 electrons, and the L-shell is filled with 8 electrons.

The K-shell binding energy for polonium can be found in a table of atomic data to be around 88 keV. The L-shell binding energy can also be found in the same table to be around 13 keV.

Therefore, the maximum characteristic x-ray photon energy from the capture of a free electron into a K-shell vacancy in polonium is:

E = (K-shell binding energy) - (L-shell binding energy)

= 88 keV - 13 keV

= 75 keV

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An internal combustion engine uses fuel, of energy content 44.4 MJ/kg, at a rate of 5 kg/h. If the efficiency is 28%, determine the power output and the rate of heat rejection

Answers

Efficiency = Power Output / Power Input

Power Input = Rate of Energy input = 44.4 MJ/kg * 5 kg/h

= 222 MJ/h

But 1 hour = 3600seconds

222 MJ/h = 222 MJ/3600s = 0.061667 MW J/s = Watts

Power input = 0.061667 MW = 61 667 W

From Efficiency = Power Output / Power Input

   28% = Power Output / 61667

   Power Output = 0.28 * 61667

   Power Output = 17266.76 W

Power Output = 17 267 W

Rate of heat Rejection = Power input - Power output

      = 61667 - 17267 = 44400 W

Rate of heat Rejection = 44 400 W.

C- Copyright.

A spring has a natural length of 20cm. If a 25-N force is required to keep it stretched to a length of 30 cm, how much work is required to stretch it from 20 cm to 25 cm?

Answers

First, we use Hooke's Law to calculate the spring constant, k:
F = kx
k = 25 / (0.3 - 0.2)
k = 250 N/m

Work = 1/2 kx²
W = 1/2 x 250 x (0.25 - 0.2)²
W = 0.3125 Joule

What is the mass of a falling rock if it produces a force of 147 N with an acceleration of 9.8 m/s2?