Diámetro de la Luna. Un día de cielo despejado y Luna llena, temprano en la mañana sostén una regla graduada en milímetros con el brazo extendido y mide el diámetro aparente de la Luna; mide también la distancia de la regla al ojo. a) ¿Cuál es el ángulo bajo el cual se ve el diámetro de la Luna desde la Tierra (diámetro angular de la Luna)? b) Estima el diámetro de la Luna considerando que está a 3.8 x 10 8 m de la Tierra.

What are similarities and differences between refraction, reflection, diffraction and absorption?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.