John traveled east at 10 m/s for ten
seconds. he realized he had gone too
far and made a u-turn. he traveled
west at 5 m/s for six seconds. calculate
john's displacement.
a. 30 m
b. 70 m
c. 100 m
d. 130 m

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.