A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg ? m/s
B) 0.262 kg ? m/s
C) 0.163 kg ? m/s
D) 0.0216 kg ? m/s
E) 0.0418 kg ? m/s
B
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What is the energy of a photon with a frequency of 6.60 × 1015 Hz?
A) 27.3 eV B) 12.3 eV C) 18.1 eV D) 19.6 eV E) 6.60 eV
A 100-newton sack of potatoes falls from an airplane. As velocity of fall increases, air resistance also increases, and when air resistance equals 100 N, the acceleration of the sack is
1) zero 2) 5 m/s2 3) 10 m/s2 4) 100 m/s2 and the velocity of the sack will be 5) 0 m/s. 6) 5 m/s. 7) 10 m/s. 8) 100 m/s. 9) constant.
Our Sun will first become a red giant, then a white dwarf, and finally a brown dwarf
Indicate whether the statement is true or false
After a glass rod is rubbed with a nylon cloth
A. both the rod and cloth will have a positive charge. B. the rod will have a negative charge and the cloth positive. C. both the rod and cloth will have a negative charge. D. the rod will have a positive charge and the cloth negative. E. the rod will have a negative charge and the cloth will be neutral.