The setup alongside shows four metal bolts with different number of windings on each. The windings (wires) are connected to a
power source.
6.1 What is this setup known as?
6.2 Which one of the four bolts will have the biggest (strongest) effect?
6.3 To which main requirement must the wire, which is turned around
the bolt comply?​​

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 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. 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.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in