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20. Fill in the rest of the chart and predict the number of F-18 nuclei left and the number of
new 0-18 nuclei produced.
Time (hours)
Number of half-lives
F-18 Nuclei (%)
0-18 Nuclei (%)
0.0
Start
100
0
2.0
1
4.0
2
6.0
3
8.0
4
10.0
5
12.0
6
14.0
7
16.0
8
18.0
9
20
10

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?

Aball horizontally thrown from a cliff at 8m/s