Hossein is a weightlifter. His best lift in training is a bar with a mass of 250kg. He does 5000 j of work on the bar with a mass of 250kg when he lifts it. The gravitational field strength (g) on earth is 10 N/kg

I am trying to calculate the weight of this 250kg mass, and how high Hossein lifts the bar.

Weight = 2,500N (I think) but can’t work out how to get the height lifted in metres..

Can anyone help in working this out, showing workings so I can work it through with my daughter.

Many thanks

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

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