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Suppose 100 mg of gold (197 79 Au) foil are exposed to a thermal neutron flux of 1012 neutrons/cm2/s in a reactor. Calculate the activity and the number of atoms of 198Au in the sample at equilibrium [Thermal neutron activation cross-section for 197Au is 98 barns and half-life for 197Au is 2.7 h]
A 5000 W electric heater is used for 32 hours. Calculate the energy consumed in this period. The plates are seperated by a distance of .100 mm. what is the current drawn by the heater
An object is fired at 30.0 m/s at an angle of 35.0 degrees from a vertical cliff that is h meters (where h is unknown quantity) above the sea. calculate the velocity vector of the object
If 62.9 L of oxygen at 18.0°C and an absolute pressure of 2.28 atm are compressed to 56.5 L and at the same time the temperature is raised to 50.0°C, What is the average translational kinetic energy of a nitrogen molecule at STP
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.7 m/s^2 for a height 65.0 cm. What is the speed of the shot when he releases it
A man on the West Bank of river is capable of swimming at 10 meter/Minutes in still water, wants to take shortest time . In what direction he should move?
A rocket has a mass of 2.00 x 10^6 kg and its engines produce a thrust of 3.50 x 10^7 N. Find its initial acceleration if takes off vertically.
A 16.2 dog is running northward at 2.77 , while a 4.51 cat is running eastward at 3.05. Find the direction and magnitude of the owner's velocity
An 82.5 kg fullback moving east with aspeed of 5.4 m/s is tackled by a87.0 kg opponent running west at3.28 m/s, and the collision is perfectly inelastic. Calculate the decrease in kinetic energy during the collision.
A man stands on the roof of a building of height 16.8m and throws a rock with a velocity of magnitude 30.6m/s at an angle of 29.3? above the horizontal. Calculate the magnitude of the velocity of the rock
A power square thread screw has a pitch diameter (dm) of 34mm, the lead of the screw 1 of 4mm, the frictional diameter of the collar (dc) of 40mm. The coefficients of friction are f=0.08 for the threads and fc=0.05 for the collar. the vertical loa..
A wheel turns with a constant angular acceleration of 0.640 rad/s^2, Through how many revolutions does the wheel turn in this interval
A projectile is launched from ground level to the top of a cliff which is 195m away and 155 m high, find the initial velocity of the projectile
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