Two ships set sail from the same port. Ship A sails a distance of 35.0 kilometers in a direction 30.0° north of east, and drops anchor. Ship B sails due south. When ship B is 30.0 km from the port, how far apart are the ships?
a. 46.1 km
b. 56.3 km
c. 65.0 km
d. 75.9 km
b
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A magnetic dipole antenna is set up due west of a radio installation that utilizes an electric dipole antenna as a transmitter. What should the orientation of the antenna be used?
A. east-west B. horizontal C. north-south D. Unable to answer given the information. E. vertical
The speed of a 4-kg ball with a momentum of 12 kg m/s is
A) 3 m/s. B) 4 m/s. C) 12 m/s. D) 48 m/s. E) none of the above
A bicycle that travels twice as fast as another when braking to a stop will skid
A) twice as far. B) four times as far. C) eight times as far D) sixteen times as far. E) depends on the bike's mass
A basketball is thrown with a velocity of 20. m/s at an angle of 60.° above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? (Neglect air friction.)
A) 10. m/s B) zero C) 20. m/s D) 17.3 m/s E) 20. tan(60°) m/s