Aforce of magnitude f1 is applied to pull the block up the incline at constant speed. the coefficient of kinetic friction between the plane and the block is μ.

1. what is the total work wfric done on the block by the force of friction as the block moves a distance l up the incline? express the work done by friction in terms of any or all of the variables μ, m, g, θ, l, and f1.
2. what is the total work wf1 done on the block by the applied force f⃗ 1 as the block moves a distance l up the incline? express your answer in terms of any or all of the variables μ, m, g, θ, l, and f1.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. 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. the block's initial mechanical energy is 9.472 j.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.

Earth's atmosphere is composed of mostly two gases. name the two gases that make up the majority of the atmosphere and use the pie chart to tell the percentages of each.