If a proton and an electron have the same de Broglie wavelengths, which one is moving faster?
A) the electron
B) the proton
C) They both have the same speed.
A
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Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V b. 63 V c. 43 V d. 84 V e. 11 V
A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its area reduces to 60% of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?
a. It must increase by 60%. c. It must decrease by 40%. b. It must increase by 120%. d. It must increase by 67%.
What is a typical asteroid made of?
A. solid hydrogen B. liquid water C. solid carbon dioxide and other gases D. rock and iron E. water frozen into ice
A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool). If some of the cargo is thrown overboard, the level of water in the lock will
A) rise. B) drop. C) stay the same. D) rise, provided it is lumber that is thrown overboard. E) rise, provided it is iron ore that is thrown overboard.