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Neptunium In the fall of 2002, a group of scientists at Los Alamos National Laboratory determined that the critical mass of neptuniwn-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a chain reaction. This element has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?
The drawing shows three identical rods (A, B, and C) moving in different planes. Find the magnitude of the motional emf for the rods
Jamal pulls a 150-N sled up a 28.0° degree slope at constant speed by a force of 100 N. With what acceleration does the sled go down the hill
A car accelerates from 20 to 60 miles per hour in 6 seconds. What is the average speed of the car during this six-second interval? (Utilize the units given in the problem.)
A block is pushed up a 10 m long ramp that is oriented at 20 degrees with respect to the horizontal. find the work done by this force in pushing the block up the ramp
You have two capacitors, one with capacitance 12.3 × 10-6 F and the other of unknown capacitance. obtain its capacitance
Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. At which destructive interference of the two radio waves occurs
An airplane pilot tries to fly directly east with a velocity of 800.0 km/h. what is the relative velocity of the airplane to the surface of the earth
A tube of mercury with resistivity 9.84 x 10-7Ω*m has a 25 N/C electric field inside thecolumn of mercury. How much current is flowing, if the diameter ofthe tube is 1.0 mm
A playground merry-go-round of radius 2.00 meter has a moment of inertia I = 290 kg•m2 and is rotating about a frictionless vertical axle. Find the angular speed of the system when kid reaches the edge
An object is placed to the left of a convex lens and on the optical axis. What is the magnification of the image formed by the lens
Choose a system consisting only the ball A. What is the momentum change of the system during the collision? What is the momentum change of the surroundings
The surfer in the photo is catching a wave. Suppose she starts at the top of the wave with a speed of 1.50 m/s, how much work is done by the (non-conservative) force of the wave
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