When we want to compare two quantities a and b, but both are measured quantities such that neither can be considered to be an exact value, we use a "percent difference." percent difference is calculated by taking the absolute value of the difference of the values divided by their average multiplied by 100, or a-b % difference = 100% for example, in a measurement where no calibrated speedometer is present, we measure two values of speed, ua-10.0 m/s ± 1.1 m/s and = 12.0 m/s ± 1.3 m/s. calculate the percent difference of the two speeds above.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

Aplane travels 1000 miles in 5 hours .what is the planes average speed?