The atomic bomb that was dropped on Nagasaki in 1945 killed 140,000 people, helping to end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosive
How much mass was converted to energy when this took place? (1000 tons ? 4.3 × 1012 J) (Incidentally, modern H-bombs have energy yields 1000 times as much!)
9.6 × 10-4 kg
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Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m
We describe a location on Earth's surface by stating its
A) altitude and direction (or azimuth). B) meridian and longitude. C) latitude and direction. D) latitude and longitude.
A 0.50-kg object is attached to an ideal spring of spring constant (force constant) 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
At what distance from the equilibrium position are the kinetic energy and potential energy of the system the same? A) 0.017 m B) 0.029 m C) 0.12 m D) 0.17 m
Suppose we put 20 non-interacting quantons into a one-dimensional box of length L. The quantons quickly settle into the lowest possible energy states available. Roughly how many times larger will the quantons’ total energy be if they are fermions as opposed to bosons?
A. About the same B. About 4 times C. About 10 times D. About 40 times E. About 400 times