Physics, 05.05.2021 17:50, Alisabeth4366
1. People working on the roofs of buildings often lay a plank of wood on the roof. They walk on the plank rather than the roof itself.
a) Explain why using a plank will help to prevent damage to the roof.
b) A workman's weight is 850 N, and each of his boots has an area of 210 cm2. Calculate the maximum pressure under his feet when he is walking. Give your answer in pascals. c) The workman lays a plank on the roof. The plank has an area of 0.3 m2 and a weight of 70 N. What is the maximum pressure under the plank when he is walking on it?(1+2+2)
Answers: 3
Physics, 21.06.2019 19:30, sariyamcgregor66321
Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.
Answers: 3
Physics, 21.06.2019 20:50, lokiliddel
An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.
Answers: 1
Physics, 21.06.2019 22:30, mooredollie
If a sphere and a cure have the same mass and are propelled up a ramp with the same force, which would travel father up the ramp? explain.
Answers: 1
1. People working on the roofs of buildings often lay a plank of wood on the roof. They walk on the...