If the half-life of \( 1-131 \) is 7.7 days, how long would it take for \( 1-131 \) to go through 5.5 half-lives? (Round your answers to two decimal points)

A magnetic pole face has a rectangular section having dimensions 200 mm by mm . If the total flux emerging from the pole is \( 150 \mu \mathrm{~Wb} \), calculate the flux density. ( 4 marl

Un disco de \( 1,0 \mathrm{~kg} \) desliza hacia la derecha sobre una superficie horizontal rugosa, con coeficiente de roce \( \mathrm{u}_{\mathrm{k}}=0,25 \). Cuando el disco tiene una rapidez \( v_{0}=3,0 \frac{\mathrm{~m}}{\mathrm{~s}} \) entra en contacto con un resorte de constante \( \mathrm{K}=50 \mathrm{~N} / \mathrm{m} \). El disco se detiene después que el resorte se ha comprimido una distancia x , para luego ser impulsado hacia la izquierda. Determine la distancia comprimida.

What is the force on a 1000 kg elevator that is falling freely at \( 9.8 \mathrm{~m} / \mathrm{sec}^{2} ? \)

If the half-life of \( 1-131 \) is 7.4 days, how many days would it take for only \( 3.2 \times \) \( 10^{-2} \) grams of \( 1-131 \) to be left in Mr. Miller's body if Dr. Goodie started him on an initial dose of 5.5 grams? (Round your answer to two decimal points)

What requirements must be met for a nuclear fu- sion reaction to occur? A select all that apply. A extremely low temperatures C extremely high temperatures D a large amount of pressure