STUCK ON PHYSICS HW, HELP? 1. Four bricks are to be stacked at the edge of a tab

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STUCK ON PHYSICS HW, HELP?

1. Four bricks are to be stacked at the edge of a table, each brick overhanging the one below it, so that the top brick extends as far as possible beyond the edge of the table. A builder wants to construct a corbeled arch (see part (b) of the figure) based on the principle of stability discussed in previous parts of the problem. What minimum number of bricks, each 0.19 m long, is needed if the arch is to span 0.69 m ? Be sure to include in the total number of bricks one brick on top and one brick at the base of each half-span of the arch.

I already tried 60 bricks, but it was wrong.

2.  A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of pe = 9.18×10^?23 kg?m/s and p? = 5.98×10^?23 kg?m/s , respectively. Determine the angle between the momentum of the electron and the momentum of the second (recoiling) nucleus.

Problem 9.39 2n(n-1H1 L dmax- 2n(n-1) @max-:.i L @max _ '.i Four bricks are to be stacked at the edge of a table, each brick overhanging the one below it, so that the top brick extends as far as possible beyond the edge of the table UImax Submit My Answers Give Up Correct Part D A builder wants to construct a corbeled arch (see part (b) of the figure) based on the principle of stability discussed in previous parts of the problem. What minimum number of bricks, each 0.19 m long, is needed if the arch is to span 0.69 m ? Be sure to include in the total number of bricks one brick on top and one brick at the base of each half-span of the arch | Figure l # 1 of 1 Express your answer as an integer Corbeleod arch bricks min = Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

2.)

b)

theta = 180 - tan^-1( Pn / Pe)

theta = 180 - tan^-1(5.98 * 10^-23 / (9.18 * 10^-23)

theta = 180 - 33.08 = 146.92 deg

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