A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?
A) 32.3 N
B) 24.1 N
C) 3.68 N
D) 5.48 N
E) 11.8 N
D
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What kind of object does a main sequence star become on first using up its core hydrogen?
A. a red giant B. a protostar C. a supernova D. a planetary nebula E. a white dwarf
Constructive interference is a result of two waves arriving at a point ________.
Fill in the blank(s) with the appropriate word(s).
Thermal Expansion: An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of 15°C. Both rods have the same diameter. The rods are now joined end-to-end to form a rod 90.0 cm long. If the temperature is now raised from 15°C to 90°C, what is the increase in the length of the joined rod? The coefficient of linear expansion of aluminum is 2.4 × 10-5 K-1 and that of steel is 1.2 × 10-5 K-1.
A. 0.90 mm B. 0.81 mm C. 0.72 mm D. 0.63 mm E. 0.99 mm
The energy levels in the atom are continuous
What will be an ideal response?