A coil with a self-inductance of 4.4 H carries a current that varies with time according to I(t) = (8.0 A)sin(2πt). Find an expression for the emf induced in the coil. (Use the following as necessary: t. Assume e m f is in volts and t is in seconds. Do not include units in your answer.)

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?