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College Physics Answers was created by Shaun Dychko, a teacher with more than 12 years experience teaching high school physics and mathematics, mostly at Point Grey Secondary in Vancouver, Canada. I have taught AP Physics, and all levels of high school mathematics. I studied physics at the University of British Columbia, where I obtained both ...
Very large forces are produced in joints when a person jumps from some height to the ground. (a) Calculate the magnitude of the force produced if an 80.0-kg person jumps from a 0.600–m-high ledge and lands stiffly, compressing joint material 1.50 cm as a result. (Be certain to include the weight of the person.)
Calculate the direction and magnitude of the force supplied by the upper vertebrae F_\textrm {V} F V to hold the head stationary, assuming that this force acts along a line through the center of mass as do the weight and muscle force. Figure 9.39 The upper vertebrae supports the tilted head. Question by OpenStax is licensed under CC BY 4.0.
3. OpenStax College Physics. Chapter 7: Work, Energy, and Energy Resources. Problem 3. Question. (a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is the work done on the lift by the gravitational force in this process? (c) What is the total work ...
Suppose a 900-kg car is on the bridge in Figure 9.33 with its center of mass halfway between the hinges and the cable attachments. (The bridge is supported by the cables and hinges only.) (a) Find the force in the cables. (b) Find the direction and magnitude of the force exerted by the hinges on the bridge. Figure 9.33 A small drawbridge.
Problem 19. Do Exercise 3.16 again using analytical techniques and change the second leg of the walk to straight south. (This is equivalent to subtracting B from A —that is, finding R' = A - B) (b) Repeat again, but now you first walk 25.0 m north and then 18.0 m east. (This is equivalent to subtract A from B — that is, to find R'' = B - A.
Question. A sandal is dropped from the top of a 15.0-m-high mast on a ship moving at 1.75 m/s due south. Calculate the velocity of the sandal when it hits the deck of the ship: (a) relative to the ship and (b) relative to a stationary observer on shore. (c) Discuss how the answers give a consistent result for the position at which the sandal ...
OpenStax College Physics, Chapter 5, Problem 29 (Problems & Exercises) Problem number. 29. OpenStax College Physics. Chapter 5: Further applications of Newton's Laws: friction, drag, and elasticity. Problem 29.
A 5.50-kg bowling ball moving at 9.00 m/s collides with a 0.850-kg bowling pin, which is scattered at an angle of 85.0^\circ 85.0∘ to the initial direction of the bowling ball and with a speed of 15.0 m/s. (a) Calculate the final velocity (magnitude and direction) of the bowling ball. (b) Is the collision elastic?
The nucleus of an atom has a radius about 10^ {-5} 10−5 that of the atom and contains nearly all the mass of the entire atom. (a) What is the approximate density of a nucleus? (b) One remnant of a supernova, called a neutron star, can have the density of a nucleus. What would be the radius of a neutron star with a mass 10 times that of our ...
