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The average banana contains 0.436 g of potassium, and 0.012% of naturally occuring potassium is 40K, which has a half-life of 1.248 x 109 years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing four bananas?
A hot-air balloon is ascending at the rate of 11 m/s and is 68 m above the ground as a package is dropped over the side. How long does it take to reach the ground.
A vertical solid steel post of diameter d = 24cm and length L = 2.10m is required to support a load of mass m = 8200kg. What is the strain in the post
The upward velocity of the 5 kg block is v1 = 3 m/s when it is at a height ht = 10 m from the sandy surface. Determine time to stop the motion of the block if the average impulsive force acting on the block
A subway train starts from rest at a station and accelerates at a rate of 1.50m/s2 for 14.2s . It runs at constant speed for 69.6s and slows down at a rate of 3.51m/s2 until it stops at the next station. find total distance covered? express answer..
A wire loop with an area of 3*10^-2 m^2 is in a magnetic field of 0.23 T directed at an angle of 30 degrees to the plane of the loop, what is the average induced emf in the loop
Two gravitational forces act on a particle, in perpendicular directions. To find the net force, can we add the magnitudes of those two forces?
You are given a container with 25.7 g of hydrogen atoms. What is the total charge on the electrons in the container? what is total charge on protons?
Find out the time that the arrow spends in the air.
While running, a person dissipates about 0.524 J of mechanical energy per step per kilogram of body mass. If a 65.5 kg person dissipates a power of 76.6 W during a race, explain how fast is the person running?
A 4 kg ball is raised a vertical distance of 2 meters. Using the conservation of energy principle calculate the final speed of the ball right before it hits the ground
Four charges Aq,Bq,Cq, and Dq (q = 5 x 10-07C) sit in a plane at the corners of a square whose sides have length d = 80.0 cm. A charge, Eq, is placed at the origin at the center of the square.
A 66-N m torque acts on a wheel with a moment of inertia 175 kg m2. If the wheel starts from rest, explain how long will it take the wheel to make one revolution?
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