Physics, 21.02.2020 19:11 ttrinityelyse17
A boat travels between two riverside cities, A and B, located 21 miles apart. The river flows in the direction from A to B at 2 mph. The boat takes a total of 10 hours to make a round trip from A to B and back to A again. How long does it take the boat to make the one-way trip from A to B if the boats speed remailer constant relative to the speed of the river in each direction
Answers: 3
Physics, 22.06.2019 00:30
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
Answers: 2
Physics, 22.06.2019 05:00
Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?
Answers: 2
Physics, 22.06.2019 10:00
Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n
Answers: 1
Physics, 22.06.2019 21:00
Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2
Answers: 1
A boat travels between two riverside cities, A and B, located 21 miles apart. The river flows in the...
Mathematics, 06.11.2019 05:31
Mathematics, 06.11.2019 05:31
World Languages, 06.11.2019 05:31
Mathematics, 06.11.2019 05:31
Social Studies, 06.11.2019 05:31
Mathematics, 06.11.2019 05:31
Social Studies, 06.11.2019 05:31
English, 06.11.2019 05:31
History, 06.11.2019 05:31
Biology, 06.11.2019 05:31