After seven half-lives have elapsed, what fraction of the original amount has changed into another element?
a. 6/7
b. 13/14
c. 127/128
d. None of these
c
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Energy Conservation With Nonconservative Forces: On a planet where g = 10.0 m/s2 and air resistance is negligible, a sled is at rest on a rough inclined hill rising at 30° as shown in the figure. The object is allowed to move and it stops on a rough horizontal surface, at a distance of 4.0 m from the bottom of the hill. The coefficient of kinetic friction on the hill is 0.40. What is the coefficient of kinetic friction between the horizontal surface and the sled?
A. 0.10 B. 0.20 C. 0.31 D. 0.40 E. 0.60
A(n) ____________________ is a subatomic particle produced in nuclear fusion that can travel through the sun and escape to space without interacting with any particles in the sun
Fill in the blank(s) with correct word
What is meant by ‘like charges?'
a. charges that are both positive b. equal amounts of charge c. charges that are both negative d. A and C
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?
a. 0.80 b. 0.51 c. 0.72 d. 80 e. 12