Un pedazo de hielo el hielo s a -10°C se encuentra en un recipiente cerrado de material aislante sin aire y se enciende un bombillo adentro del recipiente a cierta distancia del hielo, se puede afirmar que la temperatura del hielo (A) aumenta, porque se transfiere calor por radiación (B) aumenta, porque se transfiere calor por convección (C) aumenta, porque se transfiere calor por conducción(contacto) (D) no cambia, porque no hay contacto entre el bombillo y el hielo.

Work = force × a. work b. energy c. distance d. momentum

In automobile steering wheel is shown what is the ideal mechanical advantage blank? if the ama is eight what is the efficiency of the steering wheel?

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)