Ga sample of f−18 has an initial decay rate of 1.7×105 /s . part a how long will it take for the decay rate to fall to 2.1×103 /s ? (f−18 has a half-life of 1.83

What produces a record of seismic waves? richter scale seismogram barometer seismograph

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward