Which is true about mass and weight? Group of answer choices

Mass is measured with a spring scale.

Mass must be in kg and weight in N to do our calculations.

Mass and weight are the same thing.

Mass depends on location, weight is the same everywhere.

Objects dropped in a vacuum (no air) will fall at different rates because they have different weights.

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)