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In the early twentieth century women who had children out of wedlock were considered to be "feeble-minded" or to suffer from mental retardation and more likely to give birth to children who were also feeble-minded. Today, this attitude seems ridiculous. This is an example of: ___________ (and explain why).
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly nine months, as measured by a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have a..
Briefly describe: (a) Charging by friction (b) Charging by contact (c) Charging by induction *In one sentence if possible.
At a certain instant of time a particle with charge q = 12 microcoulombs is located at x=0, y=2m; its velocity at that time is v=30 m/s i. Find the magnetic field,B, at (a) the origin
An astronaut has a heart rate of 65 beats/min as measured with monitor on the spaceship. What will the heart rate be as measured with an earth observer when the astronaut’s spaceship goes by the earth at a speed of 0.60 c?
The escape speed from a very small asteroid is only 26 m/s. If you throw a rock away from the asteroid at a speed of 39 m/s, what will be its final speed.
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800 kg/m3, length 78.7 centimeter and diameter 2.80 centimeter from a storage room to a machinist. Evaluate what the weight of the rod
A lens is formed from a plastic material that has an index of refraction of 1.55. If the radius of curvature of one surface is 1.25 m, calculate the focal length and the power of the lens.
A 1.0 kg particle moves under the influence of the potential V(x) = - C x2 cos(3x), where C = 5 J/m2. Find the frequency of small oscillations about the equilibrium points for this particle
A vertical spring (spring constant =120 N/m) is mounted on the floor. Determine the amplitude at which the block will lose contact with the spring
We've seen that fish can control their buoyancy through the use of a swim bladder, a gas-filled organ inside the body. How many moles of air are in the swim bladder when the fish is at a depth of 97ft
In the typical X-ray lamp. The electrons are accelearated in the potential difference of 10000V before hitting the water cooled electrode. Find the shortest wavelength of X-rays
Richard is driving home to visit his parents. 135{\rm mi} of the trip are on the interstate highway where the speed limit is 65{\rm mph}. How many minutes does he save
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