The end of which era left many plants, insects, and salamander-like animals on the earth?
a....
Physics, 09.01.2020 12:31 jonquil201
The end of which era left many plants, insects, and salamander-like animals on the earth?
a. the precambrian time
c. the paleozoic era
b. the mesozoic era
d. the cenozoic era
Answers: 3
Physics, 22.06.2019 12:30
Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ฯ = 2770 kg/m3 and cp = 875 j/kgยฐc). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22ยฐc. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200ยฐc.
Answers: 1
Physics, 22.06.2019 14:40
During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?
Answers: 1
Physics, 22.06.2019 16:30
Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)
Answers: 1
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