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Women often suffer from back pains during pregnancy. Let usinvestigate the cause of these back pains, assuming that thewoman's mass is 60kg before pregnancy. Typically, women gain about10 kg during pregnancy due to the weight of the fetus, placenta,amniotic fluid, etc. To make the calculation easy, but stillrealistic, we shall model the unpregnant woman as a uniformcylinder of diameter 30cm. We can model the added mass due to thefetus as a 10kg sphere 25cm in diameter and centered about 5 cmoutside the woman's original front surface. (a) By how much doesher pregnancy change the horizontal location of the woman's centerof mass? (b) How does the change in part (a) affect the way thepregnant woman must stand and walk? In other words, what must shedo to her posture to make up for her shifted center of mass? (c)can you explain why she might have backaches?
A uniform ladder of mass 50 kg and length 5m leans at an angle Theta against a frictionless wall. determine the minimum angle the ladder will not slip
A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator
A storage tank has a diameter of 80 ft, a height of 25 feet, andcontains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank.
You are driving to the grocery store at 20 . You are 110 from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 and that your car brakes with constant acceleration.
Two bullets have masses of 2.9 gand 4.2 g, respectively. Each is fired with a speed of 42.0m/s. What is the kinetic energy ofthe first bullet?
the speed of an object and the direction in which it moves constitute a vector quantity known as the velocity. an
estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29 10-11 m the
4.0kg of water at 30 C is mixed with 4.0 kg of water at 47 C in a well-insulated container. Estimate the net change in entropy of the system.
A tennis ball of mass m=.080kg and speed v=30m/s strikesa wall at a 45 degree angle and rebounds with the same speed at 45degrees
A solid spherical ball of mass 2.3 kg and radius 0.11 m rolls along a smooth, What is the ball's rotational kinetic energy
At one point in a pipeline the water's speed is 3.00m/s and the gauge pressure is 5.00x10^4Pa. Find the gauge pressure at a second point in the line
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the work done on the water
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