Impulse: A batter applies an average force of 8000 N to a baseball for 1.1 ms. What is the magnitude of the impulse delivered to the baseball by the bat?
Fill in the blank(s) with the appropriate word(s).
8.8 N ? s
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What is ?1 expressed as a phase factor?
A. 
B. 
C. 
D. 
E. Something else (specify)
A coil of 57. turns of wire has a diameter of 9.5 cm and carries 7.2 Amperes
(a) How large is the magnetic field, in Tesla, at the center of the loop? (b) How many Gauss is that? (c) If the same length of wire made a coil with twice the original diameter, how large is the magnetic field now?
A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero?
(k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 0 N/C B) 12.5 MN/C C) 0.75 MN/C D) 25 MN/C E) 1.5 MN/C
A string attached to an airborne kite is maintained at an angle of 44.0° with the horizontal. If a total of 160 m of string is reeled in while bringing the kite back to the ground, what is the horizontal displacement of the kite in the process? (Assume the kite string doesn't sag.)
a. 111 m b. 80.0 m c. 31.7 m d. 115 m e. 155 m