The ability of a material to transfer heat or electric current is called
a. conductivity.
b. insulation.
c. convection.
d. porosity

Why should seat belts not be mandatory quick plz

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

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?