# HW4 5A F21.pdf - Homework 4 Physics 5A Due Wednesday...

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Homework 4Physics 5ADue Wednesday 9/22/21(1) (10 pts) Matt is trying to move a crate of all of his physics books into his new house.The crate is heavier than Matt himself and rests on a rough floor. The coefficientof static friction between the crate and the floor is the same as that between Matt’sshoes and the floor. Can Matt push the crate? (Fig. 1 right)Figure 1.left:An approximation of the force between 2 atoms in a diatomicmoleculeright:Matt pushing a crate(2) KK 3.2 (10 pts)(3) KK 3-5 (10 pts)(4) KK 3.22 (10 pts)(5) KK 3.10 (10 pts)(6) KK 3.12 (10 pts)(7) KK 3.17 (10 pts)(8) A uniform circular plate of radius 2R has a circular hole of radius R cut out of itas shown in Fig. 2. The center C’ of the smaller circle is a distance 0.8R from thecenter C of the larger circle. Where is the center of mass of the plate? hint: trysubtraction.(9) KK 4.1 (10 pts)(10) An artillery shell accidentally exploded at the top of its parabolic trajectory. Thehorizontal distance between the launch point and the point of the explosion is L.The shell breaks into 2 pieces that fly apart horizontally. The larger piece has 3times the mass of the smaller piece. To the surprise of the scientist in charge, thesmaller piece returns to Earth at the launch point. How far away does the largerpiece land? Neglect air resistance and earth’s curvature . (10 pts)(11) Challenge Problem: Math tricks to solve non-linear friction problems (20 pts ...remember you can get a 100 without attempting this)If you have ever stuck your hand out the window of a moving car, you may havenoticed the wind pushing back on your hand. This air resistance is a force directedin the opposite direction of motion and increases with the velocity of the object(in essence, air molecules collide with your hand at increasing speeds, resulting in1
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Term
Fall
Professor
NoProfessor
Tags
Mass, Drag physics