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The nucleus of a promethium-145 atomcontains 61 protons. Assume that thenucleus is a sphere with radius 5.69fm and with the charge of the protons uniformly spread through thesphere. At the nucleus surface, what are the magnitude and direction of the electric field produced by the protons?
A rock is suspended by a light string. When the rock is in air, the tension in the string is 39.1 N. What is the density of the unknown liquid
If a washing machine's drum has a radius of 26 cm and spins at 4.0 rev/s, what is the strength of the artificial gravity to which the clothes are subjected
A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +40 N·m is applied to the wheel for 17 s, giving the wheel an angular velocity of +520 rev/min. Find the frictional torque
A baseball is bunted down the third-base line leaving the bat from a height of 0.850m with an initial velocity of 4.00m/s at an angle of 36.87° above horizontal, what is the baseball's tangential acceleration at maximum height
The function y(x,t) = (27.0cm)cos(pix-22pit) with x in meters and t in seconds, What is the transverse speed for a point on the string at an instant when that point has the displacement y = +24.0 cm
Blood with density 1.06 g/cm^3 and 10-kPa gauge pressure flows through an artery at 27cm/s. What fraction of the artery's area is obstructed
uniform thin rod of length L=2.5 m and mass 2 kg can rotate in a horizontal plane about a vertical axis through its center. what is the angular velocity of the rod immediately after the collision
A proton of charge +1.60Ã-10-19 C and mass 1.67Ã-10-27 kg is introduced into a region of B = 0.149 T, What is the radius of the proton's path
A boy of mass 50 kg runs up a hill of vertical height 300 m in 20 minutes. calculate the work he does climbing the hill
The specifications associated with a commercial spectrophotometer are: Diffraction grating with 600 groves per mm. What is the reciprocal of the linear dispersion
The bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 15.3% of what would be found in a similar live animal. How old are these bones (in years)
A rotating wheel requires a time t = 4.32s to rotate 37.0 revolutions. What is the constant angular acceleration (rad/s2 of the wheel
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