Impulse: During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A. to exert a larger force on the shells
B. to reduce frictional losses
C. to allow the force of the expanding gases from the gunpowder to act for a longer time
D. to increase the force exerted on the bullet due to the expanding gases from the gunpowder
E. to reduce the force exerted on the bullet due to the expanding gases from the gunpowder
Answer: C
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Vector A has a magnitude of 3.0 units and makes an angle of -90.0
with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
with the positive x-axis. What is the direction of the vector sum of A + B referenced to the positive x-axis?
A. -107
B. 55
C. -55
D. -145
Sidereal period is defined as the time interval between two successive conjunctions of a planet with
a) the Sun as observed from Earth. b) Earth as observed from the Sun. c) any other planet besides Earth. d) any star other than the Sun.