Find the percentage of the total work lost to friction if 22.9 J of work is put into pushing a block up a ramp resulting in 13.5 J of stored potential energy at the top. Report the percentage lost as a positive number.

41.0%

Explanation:

According to the law of conservation of energy, in absence of friction the work done on the block must be equal to the final potential energy stored on the block at the top of the ramp.

However, here there is friction acting opposite to the motion of the block, so part of the energy is lost due to the work done by friction. The energy lost is:

where:

W = 22.9 J is the work done by the applied force

E' = 13.5 J is the potential energy stored at the top of the ramp

Therefore,

And therefore, the percentage loss of energy is:

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.