During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a long barrel. What is the reason for using a long barrel in these guns?
A) To provide a larger ratio of kinetic energy to potential energy.
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.
C
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Three negative charges of equal magnitudes are positioned along the x-axis at x = -a, x=0, and x = +a respectively. The charge located at x=0 is moved away along the y-axis to a position (x,y) = (0, +a)
How does the potential energy of the system of charges change as a result? A) The potential energy may increase or decrease depending on the magnitude of the charges. B) The potential energy increases. C) The potential energy decreases. D) The potential energy stays the same. E) More information is needed to answer the question.
When a wave source moves toward a receiver what does the receiver encounter?:
a) An increase in wave speed b) Nothing c) An decrease in wave frequency d) An increase in wave frequency
Why are lunar eclipses more commonly seen than solar eclipses?
A. Lunar eclipses occur at night and are easier to see. B. The Moon goes around the Earth faster than the Earth goes around the Sun. C. The tilt of the Moon's axis is smaller than the Earth's. D. The Earth casts a bigger shadow than the Moon.
The slope of a tangent line at a given time value on a velocity versus time graph gives
A) displacement. B) instantaneous velocity. C) average velocity. D) instantaneous acceleration. E) average acceleration.