Question

2. Suppose a piano tuner stretches a steel piano wire 6.5
mm.

The wire was originally 0.825 mm in diameter, 1.43 m long, and has
a Young's modulus of 2.10x1011 N/m2.

Calculate the force a piano tuner applies to stretch the steel
piano wire in Newtons.

F=__________

3. Suppose a 66-kg mountain climber has a 0.86 cm diameter nylon
rope.

By how much does the mountain climber stretch her rope, in
centimeters, when she hangs 43 m below a rock outcropping?

Assume the Young's modulus of the rope is 5 × 10^9 N/m2.

ΔL=__________

6. A 0.95-kg mass oscillates according to the equation

x(t)=0.55 cos(14.5t), where the position x(t) is measured in
meters.

what is the period, in seconds, of this mass?

T=_________

At what point durring the cycle is the mass moving at it's
maximum speed?

A .It will change from cycle to cycle.

B.When displacement approaches the maximum amplitude

C.At the equilibrium points and at the maximum amplitudes.

D. At the equilibrium points in the middle of the cycle.

E. There is not enough information to answer.

What is the maximum acceleration of the mass, in meters per
square second?

amax=_______

At what point in the cycle will it reach it's maximum
acceleration?

A.It changes from cycle to cycle

B.At equilibrium points of the cycle.

C.At 1/4 and 3/4 points in its cycle.

D.At the maximum displacement of the cycle

E.There is not enough information to answer

Answer #1

What hanging mass will stretch a 2.4-m-long, 0.49 mm - diameter
steel wire by 1.5 mm ? The Young's modulus of steel is
20×10^10N/m^2
Express your answer in kilograms.

A student is testing a 1.0 m length of 2.0-mm-diameter steel
wire.
Part A How much force is required to stretch this wire by 1.0
mm? Young's modulus for steel is 20×1010N/m2. Express your answer
to two significant figures and include the appropriate units.
F=
Part B What length of 4.0-mm-diameter wire would be stretched by
1.0 mm by this force? Express your answer to two significant
figures and include the appropriate units.
L2 =

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