Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground
A) both of them will have the same kinetic energy.
B) the heavier one will have twice the kinetic energy of the lighter one.
C) the heavier one will have four times the kinetic energy of the lighter one.
D) the heavier one will have times the kinetic energy of the lighter one.
B
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The dimensionless dielectric _________is the magnitude of the polarization of the dielectric material divided by the surface-charge density of a vacuum capacitor.
Fill in the blank(s) with the appropriate word(s).
A solid sphere of mass 2.50 kg and radius 0.120 m is at rest at the top of a ramp inclined 15.0°. It rolls to the bottom without slipping. The upper end of the ramp is 1.20 m higher than the lower end. Find the sphere's total kinetic energy when it reaches the bottom
a. 70.0 J b. 47.9 J c. 29.4 J d. 8.80 J
Two parallel square metal plates, 8.4 cm on each side, are 2.5 mm apart and carry equal but opposite charge uniformly distributed over their facing surfaces
How much excess charge is there on each plate if the electric field between the plates has a magnitude of 2.0 × 106 N/C? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta decay. How much energy (in MeV) is released if carbon-14 has a mass of 14.003242 u and nitrogen-14 has a mass of 14.003074 u?
A) 0.00157 MeV B) 0.0157 MeV C) 0.157 MeV D) 1.57 MeV E) 15.7 MeV