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 -90.0with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
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A. -107
B. 55
C. -55
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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.