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Neutrons released by a fission reaction must be slowed by collisions with the moderator nuclei before the neutrons can cause further fissions. Assume a 1.3 MeV neutron leaves each collision with 66 percent of its incident energy. Determine how many collisions are required to reduce the neutron's energy to at least 0.040 eV, find which is the energy of a thermal neutron?
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.0 multiply.gif 104 rev/min. Determine the angle (in radians) through which the drill rotates during this period
charge is distributed with constant volume density d throughout the rectangular box with length a width b and height
A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9kJ of heat is applied to the system and it does 5kJ of work, how much does the internal energy change?
A rock is thrown vertically upward from ground level at timet = 0. At t = 1.6 s it passes the top of a talltower, and 3.0 s later it reaches its maximum height. What is the height of the tower?
calculate the speed of an electron that is accelerated through the same potential difference, and Calculate the speed of a proton
An 11.70 kg weather rocket generates a thrust of 240 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring steady is 470 N/m, is anchored to the ground.
A 75kg passenger on a roller coaster travels through the bottom of a curve with a radius of 10m at a speed of 15 m/s. what is the apparent weight of the passenger at the bottom of the curve
A rifle with a weight of 20 N fires a 3.5-g bullet with a speed of 250 m/s. (a) Find the recoil speed of the rifle. Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 10%. Double check your calculations. m..
a blacksmith uses the heat energy from an oven to heat steel and other metals. increasing the temperature makes it
What is the force on the bottom of a 36.0 cm tall cylindrical beaker with a diameter o 6.0 cm with water filled to its brim, answers in N.
What is the spring constant (k) of the bungee cord.At what time will the object be moving with a speed of 15 m/s.
Consider a gas of neutrons in a nuclear reactor. The neutron density is 10^8 neutrons/cm^3 in an operating reactor which has a core temperature of 535K. Are the neutrons in the reactor core a classical gas or a quantum mechanical gas and how ca n yo..
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