The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force on the electron due to the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 2.9 nN
B) 1000 C
C) 3.7 nN
D) 6.8 nN
E) 9.2 nN
E
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The zodiac is tilted by 23.5 degrees relative to the Celestial Equator.
Answer the following statement true (T) or false (F)
A child pulls on a wagon with a force of 75N If the wagon moves a total of 42m in 3.1min what is the average power delivered by the child?
A) 21 W B) 22 W C) 26 W D) 17 W
The maximum possible speed in nature is
a. warp 10 b. the speed of light. c. infinite. d. unknown.
A pipe open at both ends resonates at a fundamental frequency fopen. When one end is covered and the pipe is again made to resonate, the fundamental frequency is fclosed. Which of the following expressions describes how these two resonant frequencies compare?
1. fclosed = fopen 2. fclosed = 3/2 fopen 3. fclosed = 2fopen 4. fclosed = 1/2 fopen 5.none of these