La densità media della Terra è 5,51 g/cm3 e la sua massa è 5,9742 ´ 1024 kg. a. Approssima la forma della Terra con una sfera e calcola il suo raggio in km con il corretto
numero di cifre significative.
b. Confronta l’ordine di grandezza della massa della Luna, pari a 7,35 ´ 1022 kg, con quello della
massa della Terra

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

The discovery of the electron as a subatomic particle was a result of

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?