Un corp este tras orizontal si rectiliniu uniform pe o suprafata plana cu ajutorul unui dinamometru. Dinamometrul indiva 15 diviziuni . Daca se suspenda corpul de carligul ndinsmometrului tinut vertical, el va indica 35 diviziuni. sa se determine raportul dintre forta de frecare si greutatea corpului. Va rog ajutati-ma cu asta cat de repede puteti

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?