The angular momentum of a rotating body is constant when the net ________ on the body is zero.
Fill in the blank(s) with the appropriate word(s).
torque
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Kepler's second law is about the speed of planets, where planets move faster at perihelion and slower at aphelion
a. True b. False Indicate whether the statement is true or false
The sun is
a. a star which generates its own energy b. 1 AU from Earth. c. visible by its own light emission. d. all of the above
Torque: A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 5.5 A, as shown in the figure. A uniform external magnetic field of magnitude 2.9 T in the -x direction is present. Segment CD is in the xz-plane and forms a 35° angle with the z-axis, as shown. What is the magnitude of the torque that the magnetic field exerts on the loop?
A. 1.1 N ? m B. 0.73 N ? m C. 1.3 N ? m D. 1.4 N ? m E. 1.6 N ? m
The molecular formula of "buckyball" is ______________
Fill in the blank(s) with correct word