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A woman who is late in her pregnancy often leans backwards slightly when getting out of chairs and even while walking.
(a) Using the concept of torque, explain why she does this. Standing and walking (while in the family way) often causes lower back pain. But when she wears a backpack this pain is reduced or even eliminated.
(b) Why is the backpack helpful
(c) Is there an optimum pack weight for minimal discomfort?
An infinitely long uniformly charged cylinder of radius R is shown. (a) Using symmetry arguments, sketch the shape of the electric field of the cylinder. (h) Use Gauss's Law to show that the electric field magnitude within the cylinder is
An electron moving parallel to the x axis has an initial speed of 3.70x10^6 m/s at the origin. Calculate the potential difference between the origin and that point.
The diffusion constant for the alcohol ethanol in water is 1.24 10-9 m2/s. A cylinder has a cross-sectional area of 3.95 cm2 and a length of 2.02 cm. what mass of ethanol diffuses through the cylinder
Two parallel rods are each 0.50 m in length. They are attached at their centers to either end of the spring (spring constant = 150 N/m) that is initially neither stretched nor compressed.
With what frequency should the tip be tapped to make the strip oscillate with maximum amplitude?
q1. an airplane has a mass of 31000 kilos and takes off under influence of a constant net force of 37000 nektons. what
A 70-kg astronaut floating in space in a 110-kgMMU (manned maneuvering unit) experiences an acceleration of 0.029 m/s2 when he fires one of the MMU's thrusters. What is the thrust of the thruster
A crane weights 10500kg and the wrecking ball is 800kg. the arm of a crane can extend to a lenght of 22m. Whats the max speed of the wrecking ball
A wave on a string is described by the relation y = A sin(47t - 0.023x), where t is measured in seconds and x in meters, with A = 0.18 m, Find the frequency of the wave
An AC generator has an output rms voltage of 94 V at a frequency of 76 Hz.find the inductive reactance and rms current
What is the magnitude of the normal force that each brake pad applies to the rim . find the length of the meterstick as measured in frame S1 according to classical physics. Reply in units of m.
a mass of 0.30 kg is attached to a spring and is set into vibration with a period of 0.24s. what is the spring
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