Physics, 09.02.2021 01:50 ybetancourt1
A girl weighing 500 Newtons takes 50 seconds to climb a flight of stairs 18 meters high at a speed of 0.36 m/s. Her power output vertically is-
Answers: 1
Physics, 21.06.2019 16:30
Aball bearing at 220.0 °c is dropped into a cup containing 250.0 g of water at 20.0 °c. the water and ball bearing come to a temperature of 30.0 °c. what is the heat capacity of the ball bearing in j/°c? (hint: how are the algebraic signs of q related for the ball bearing and the water? )
Answers: 1
Physics, 21.06.2019 18:00
This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical
Answers: 2
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 05:20
Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1
Answers: 1
A girl weighing 500 Newtons takes 50 seconds to climb a flight of stairs 18 meters
high at a speed...
Biology, 30.10.2020 04:10
French, 30.10.2020 04:10
Mathematics, 30.10.2020 04:10
Mathematics, 30.10.2020 04:10
Mathematics, 30.10.2020 04:10
Mathematics, 30.10.2020 04:10
Mathematics, 30.10.2020 04:10
Biology, 30.10.2020 04:10
Social Studies, 30.10.2020 04:10
Spanish, 30.10.2020 04:10