A bird flies 3.0 km due west and then 2.0 due north. Another bird flies 2.0 km due west and 3.0 KM due north. What is the angle between the net displacement vectors for the two birds?
A. 23 Degrees
B. 34 Degrees
C. 56 degrees
D. 90 degrees
Ans: A. 23 Degrees
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A rocket of length 80 m sits on a launch pad. The center of mass of the rocket is located 32 m above the ground. The rocket is launched to an altitude of 100 km. Where is the location of the center of mass of the total rocket-fuel system at the altitude of 100 km?
A. at ground level B. 32 m above ground level C. 40 m above ground level D. 80 m above ground level E. 50 km above ground level
When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?
a. 4 b. 5 c. 6 d. 10 e. The correct answer is not given.
The density of water at 0°C is 999.84 kg/m3 and at 4°C it is 999.96 kg/m3. A 1.0-liter container, full to the brim with water at 4°C is placed in the refrigerator
By the time that the temperature of the water reaches 0°C, how much of the water has spilled from the container, assuming that the contraction of the container is negligible? A) 1.1 × 10-7m3 B) 1.2 × 10-7m3 C) 1.3 × 10-7m3 D) 1.4 × 10-7m3 E) 1.5 × 10-7m3
When a mass of 180 g is attached to a vertical spring and lowered to its equilibrium position, it is found that the spring extends 12 cm
If the mass is now displaced from its equilibrium position, what is the period of the resulting oscillations? A) 2.2 s B) 3.7 s C) 0.69 s D) 9.0 s E) 1.5 s