All Cepheids are giants, but not all giant stars are Cepheid variables
Indicate whether the statement is true or false
TRUE
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Which of the following energy forms is involved in winding a pocket watch?
a. electrical energy b. nonmechanical energy c. gravitational potential energy d. elastic potential energy
Atomic Nucleus: In a head-on collision, an alpha particle (Z = 2) of energy 8.20 MeV bounces straight back from a nucleus of charge 80.0 e. How close were the centers of the objects at closest approach? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 2.81 × 10-14 m B. 3.39 × 10-12 m C. 6.56 × 10-15 m D. 2.17 × 10-14 m
A conducting bar of length L rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA?VB?
A. +24 mV B. ?24 mV C. +16 mV D. ?16 mV E. +32 mV
A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above