Help Needed: Solving Two Tough Physics Problems

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SUMMARY

The discussion focuses on two physics problems involving force calculations. The first problem requires determining the force exerted by a bodybuilder lifting a 35-kg steel barbell underwater, which involves understanding buoyancy principles. The second problem involves calculating the force applied to trash in a hydraulic press with input and output piston radii of 6.1 x 10-3 m and 4.5 x 10-2 m, respectively, given an input force of 300 N. Both problems emphasize the importance of foundational physics concepts such as buoyancy and hydraulic systems.

PREREQUISITES
  • Understanding of buoyancy principles
  • Knowledge of hydraulic systems and Pascal's Law
  • Familiarity with force calculations in physics
  • Basic algebra for solving equations
NEXT STEPS
  • Study buoyancy calculations and Archimedes' principle
  • Learn about Pascal's Law and its applications in hydraulic systems
  • Explore force and pressure relationships in fluid mechanics
  • Practice solving physics problems involving levers and hydraulic presses
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone preparing for exams that involve force calculations and fluid mechanics principles.

jkd989
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A bodybuilder is holding a 35-kg steel barbell above her head. How much force would she have to exert if the barbell were lifted underwater?

In the hydraulic press used in a trash compactor, the radii of the input piston and the output plunger are 6.1 10-3 m and 4.5 10-2, respectively. If the height difference between the input piston and the output plunger can be neglected, what force is applied to the trash when the input force is 300 N?

Please answer these questions for me, they are the last two problems on my 100 problem worksheet that is due tomorrow. I have literally spent the past two hours trying to find the answers for these and i really need a good grade...Thanks in advance!
 
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We don't just give answers here. Tell us how you have started these problems. (hint: do you understand the concepts of buoyancy and levers?)

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