A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.20 km; angle of launch = ?/4; landing height = launch height
What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s
B) 1.4 m/s
C) 22 m/s
D) 0.69 m/s
A
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Which of the following statements is a true statement?
A) A vector can have positive or negative magnitudes. B) A vector's magnitude cannot be more than the magnitude of one of its components. C) A vector's magnitude cannot be less than the sum of the magnitude of its components. D) If the x-component of a vector is smaller than its y-component then that vector is in the opposite direction to its y-component. E) The magnitude of a vector cannot be zero unless all of its components are zero.
When an artery gets a constricted region due to plaque, how does the pressure in this region compare to the pressure in an unconstricted region adjacent?
a. Since this is a closed system, the pressure is the same in both regions. b. In the constricted region the blood moves at a higher speed than in the unconstricted region, resulting in an increased pressure. c. In the constricted region the blood moves at a higher speed than in the unconstricted region, resulting in a decreased pressure. d. In the constricted region the blood moves at a lower speed than in the unconstricted region, resulting in an increased pressure.
The Great Dark Spot of Neptune is probably just as long-lived as the more famed Great Red Spot of Jupiter; both lie at about the same latitudes, and are about the same size, relative to their planet
Indicate whether the statement is true or false
In the Miller-Urey experiment, the electric discharge was meant to simulate
A) meteorite impacts. B) radiation. C) volcanic heating. D) lightning. E) ultraviolet light.