Por qué cuando en el polo norte de la tierra es invierno, en el polo sur es verano??​

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?