i need help working these out step by step please 36.)In England in the middle a

Question

i need help working these out step by step please

36.)In England in the middle ages an extensive system of canals was used for transportation. Some of these canals crossed over canyons by flowing over bridges (viaducts). Suppose that a heavily loaded barge crossed over such a waterway bridge.

A.) the force on the bridge would not change when the barge passed over.

B.) The force on the bridge would become less because of the buoyancy effect of the water on the barge

C.) The force downward on the bridge would increase because of the added weight of the barge.

D.) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary

E.) The force on the barge would become less because some water would be squeezed off the bridge.

37.) A container of water is placed on scale, and the scale reads 120 g now a 20g piece of copper (specified gravity = 8.90) is suspended from a thread and lowered into the water, not touching the bottom of the container. What will the scale now read?

a.) 138g b.) 120g c.)112 d.)122 E.)140

38.) A person consumes a large meal containing 13kcal. What is the power this meal produces if it is to be "burned off" due to exercise in 6 hours.

a) 2.5 W b) 9055 W c) 0.6 W d) 0.0025 W

39.) an ideal gas has a volume of .20m^3, a temperature of 30 degrees Celsius and a pressure of 1.0 atm. it is heated to 60 degrees Celsius and compressed to a volume of .15 m^3. What is the new pressure?

a) 1.0 atm b)1.2 atm c)1.5 atm d) 2.7 atm

40.) salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?

a) salt water b)fresh water c) buoyant force is the same in both d)not enough info to determine

Explanation / Answer

36) B.) The force on the bridge would become less because of the buoyancy effect of the water on the barge

37)mass read = 120 + 20/8.9

=122 grams

38)applying the ideal gas equation,

1*0.2/(273+30) = P*0.15/(273+60)

or P=1.465 atm

39) energy= 13kcal=54415.4 joules
so power= energy/time
=54415.4/(6*60*60)
=2.5 W

40)a) salt water (since density of salt water is more)

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.