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2 years ago

12

A person is attracted toward the centerof the earth by a 500 n gravitational force. the force with which the earth is attracted

toward the person is

1 answer:

nignag [31]2 years ago

4 0

500 N is the answer, you just tell that the moon is attracted towards the person because of the Earth's huge mass.

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Imagine that a machine enables you to do 100 joules of work with a force input of 20 newtons. Now imagine that a new machine is

netineya [11]

The machine will make you twice a s strong

8 0

2 years ago

If you run 12 km at an average speed of 4 km/h, how<br> much time does it take?

Shtirlitz [24]

Answer:

3 hours, I think

Explanation:

4 0

2 years ago

Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 1.45 eV. What is the work functio

Bess [88]

Answer:

W = 3.73 eV

Explanation:

Given data:

wavelength of photons 240 nm

kinetic energy 1.45 eV

B y using photoelectric equation

Kinetic Energy = Photon Energy - work friction

$K.E = \frac{hc}{\lambda} -W$

$\frac{hc}{\lambda} = \frac{6.63\times 10^{-34}\times 3\times 10^8}{240\times 10^{-9}\times 1.6\times 10^{-19}} eV$

= 5.179 eV

= 5.18 eV $W = \frac{hc}{\lambda} - K.E$

= (5.18 - 1.45) eV

W = 3.73 eV

3 0

2 years ago

Suppose a vacuum cleaner uses 120 J of electrical energy. If 45 J are used to pull air into the vacuum cleaner, how efficient is

Zigmanuir [339]

Efficiency = 45J/120J = 0.375

Or

0.375 * 100% = 37.5 %

3 0

2 years ago

The former soviet union launched the first artificial earth satellite. What is the name of this satelitte?

faltersainse [42]

Answer:

Sputnik I.

Explanation:

The Soviet Union (former) launched the first artificial earth satellite called Sputnik I on October 4, 1957.

It had a diameter of 58 cm and it weighed 83.6 kg. It had an orbital period of 5880 seconds around the earth. It orbited the 11 weeks (officially 3 weeks but then, its battery died and it orbited for 8 weeks before falling back into the earth's atmosphere).

7 0

2 years ago