Cuantas calorías se necesitan para cambiar la temperatura de 125 gr de hierro de 23 °C a 100 °C RI 1058.75 Cal.​

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

How does concentration affect reaction rate

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?