Use the periodic table to find the atomic number, number of protons, number of electrons, and number of valence electrons for each of the following elements
a. barium
b. tin
c. phosphorus
a . 56, 56, 56, 2
b. 50, 50, 50, 4
c. 15, 15, 15, 5
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An electric motor produces 2.0 hp in a Vrms = 120 V circuit. What is Irms for this motor? (1 hp = 746 W)
a. 12 A c. 0.62 A b. 6.2 A d. 1.6 A
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N × m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
a. 0.37 T b. 1.6 T c. 0.50 T d. 1.2 T e. 2.5 T
An atom is excited when one or more of its electrons
A) vibrates. B) is boosted into higher energy levels. C) undergoes a frequency change. D) becomes frantic.
In the light curve of a nova, the rise to maximum luminosity takes only a few ________
Fill in the blank(s) with correct word