A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
a. 48 cm
b. 17 cm
c. 31 cm
d. 69 cm
e. 52 cm
C
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A copper cable needs to carry a current of 200 A with a power loss of only 3.0 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 ´ 10-8 W×m.)
1) 0.21 cm 2) 0.85 cm 3) 3.2 cm 4) 4.0 cm 5) 4.7 cm
What types of observations are necessary to determine the absolute luminosity of a star?
What will be an ideal response?
A mass of 355 g hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125 kg?m2 and a radius of 15.0 cm. A mass of 680 g hangs from the other end
When the masses are released, the larger mass accelerates downward, the lighter mass accelerates upward, and the pulley turns without the string slipping on the pulley. What is the acceleration of the masses? A) 2.00 m/s2 B) 3.82 m/s2 C) 2.87 m/s2 D) 5.74 m/s2 E) 7.78 m/s2
A bone is dug up and analyzed and found to contain 1/16--one sixteenth--of the amount of 14C radioactivity of normal bones in living bodies. The half-life of 14C is 6000 years. Roughly how long has the individual been dead?
A) 24, 000 years B) 6000 years C) 30,000 years D) 36,000 years E) Impossible to tell from the given information.