A stream of electrons passes through a velocity filter where the crossed magnetic and electric fields are 0.020 T and 5.00 × 10^4 V/m, respectively. Find the kinetic energy (in electron volts) of the electrons passing through the filter. [1 eV = 1.60 × 10^?19 J]
17.8 eV
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The lowest energy level in an atom is its __________
Fill in the blank(s) with correct word
Consider a student whose mass is 70. kg (he weighs 154. lb). If all his mass were converted to energy, this energy could light a 100. watt lamp for how long?
What will be an ideal response?
Thin Lenses: How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object?
A. 33 mm B. 42 mm C. 48 mm D. 54 mm
A rocket of length 80 m sits on a launch pad. The center of mass of the rocket is located 32 m above the ground. The rocket is launched to an altitude of 100 km. Where is the location of the center of mass of the total rocket-fuel system at the altitude of 100 km?
A. at ground level B. 32 m above ground level C. 40 m above ground level D. 80 m above ground level E. 50 km above ground level