I NEED HELP WITH THESE PLEASE!! 1) A 25-kg piece of equipment can be hung by ste

Question

I NEED HELP WITH THESE PLEASE!!

1) A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all
the wires have the same diameter, which one will stretch the greatest distance?
A) the 2.00-m wire
B) the 1.00-m wire
C) the 3.00-m wire
D) They will all stretch by the same distance

2) Which one of the following is an accurate statement?
A) Tensile stress is measured in newtons.
B) Tensile strain is measured in meters.
C) "Stress" has a meaning very close to "stretch."
D) "Strain" has a meaning very close to "force."
E) The ratio of tensile stress to tensile strain is called Young's modulus

3) 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal
areas, filled with oil with a density of 800 kg/m and capped at both ends with tight-fitting
pistons. The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius
of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at
the same level. What is the force that must be applied to the smaller piston in order to lift the car
after it has been raised 1.20 m? For purposes of this problem, neglect the weight of the pistons.
A) 1.96 kN

B) 3.67 kN

C) 0.954 kN

D) 1.20 kN

E) 1.88 kN

4) A spaceship carrying a light clock moves at a speed of 0.960c relative to an observer on Earth. If
the clock on the ship advances by 1.00 s as measured by the space travelers aboard the ship, how
long did that advance take as measured by the observer on Earth?
A) 2.6 s

B) 1.2 s

C) 0.96 s

D) 5.8 s

E) 3.6 s

5) Someone in Earth's rest frame says that a spaceship's trip between two planets took 10.0 y, while
an astronaut on the space ship says that the trip took 5.78 y. What is the speed of the spaceship,
assuming the planets are at essentially at rest?
A) 0.975 c

B) 0.384 c

C) 0.735 c

D) 0.816 c

Explanation / Answer

Extension in the wire is given by, e = FL/EA
Where ,
F is the Force,
A is the Area
L is the Length of wire
E is Young's Modulus

Therefore we can clearly see, Extension depends on the Length of the wire.
More the Length More Extension.

Correct Option - C) the 3.00-m wire.

Please post seperate questions in seperate post.

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