5. Jimmy eats 2.0 kg of watermelon at the summer picnic. The watermeton rises de

Question

5. Jimmy eats 2.0 kg of watermelon at the summer picnic. The watermeton rises degrees C after it reaches his stomach. Assuming the watermelon has a specific heat capacity of 4,200 J/KgC, how much thermal energy does it absorb? a. 168,000 J b. 124,000 J c. 96,000 J d. none of the answers 6. A temperature of 2, ??C. By how much does the carrier lengthen when it is traveling in steel aircraft carrier is 370 m long when moving through the icy North Atlantic at a e warm Mediterranean Sea at a temperature of 21 C? The coefficient of linear thermal expansion of steel is 12 x 106 C1 a. 022 m b. .084 m c. 16 m d. None of the answers Part III Problem Solving 7. A barber's chair with a person in it weighs 2100 N. The output plunger of a hydraulic system begins to lift the chair when the barber's foot applies a force of 55 N to the input piston with an area of 0.02 m. What is the area of the output piston? 8. At a given instant, the blood pressure in the heart is 16,300 Pa. If an artery in the foot is 0.55 m below the heart, what is the pressure in the artery? (Assume that blood has a density of 1000 kg/m3) 9. Two train cars collide. Car A has a mass of 12,000 kg and is moving at a velocity of5 m/s. Car B has a mass of 24,000 kg and is stationary. Assuming the collide inelastically, a. find the final velocity of the two cars. (5 points)

Explanation / Answer

6.

the expansion is length is given by:

dL = L0*alpha*dT

dL = 370*12*10^-6*(21 - 2)

dL = 0.084 m

Correct option is B.

7.

Pressure is given by:

P = F/A

Since pressure on both output and input plunger will be same, So

Fo/Ao = Fi/Ai

Ao = Ai*(Fo/Fi)

Using given values:

Ao = 0.02*55/(2100)

Ao = 5.24*10^-4 m^2

Please Upvote.

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