The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material?
a. 21.5 g/cm3
c. 13.6 g/cm3
b. 19.3 g/cm3
d. 10.7 g/cm3
A
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Where did the asteroid that is believed responsible for the extinction of the dinosaurs hit the surface of the Earth?
A) in Siberia in Russia B) in the desert in Arizona C) in the middle of the Pacific Ocean D) in the Yucatan peninsula in Mexico
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it
a. True b. False Indicate whether the statement is true or false
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Kinetic energy is conserved
a. True b. False Indicate whether the statement is true or false