Expert: Sherman D. - 3/20/2005

Question
I hope you can help me with these questions. If not maybe you can direct me to someone who can. I am a homeschool mom and am trying to get through the next few courses.
1. A tank with a flat bottom is filled with water to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)
A. 4.0 kPa B. 9.8 kPa C. 18.9 kPa D. 39.2 kPa

2. A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?
A. 5,362.56 N B. 6,150.64 N C. 6,700.56 N
D. 7,600.18 N

3. When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of about
A. 0.15. B. 1.0. C. 1.3. D. 2.5.

4. If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be
A. lower than the mercury in the vessel, and shaped like the outside of an umbrella.
B. higher than the mercury in the vessel, and shaped like the outside of an umbrella.
C. lower than the mercury in the vessel, and shaped like the inside of a bowl.
D. higher than the mercury in the vessel, and shaped like the inside of a bowl.

5. How much time should be allowed for a 605-mile car trip if the car will be traveling at an average speed of 55 miles per hour?
A. 8.75 hours B. 9 hours C. 10.5 hours D. 11 hours  

Answer
Sorry, can't really help you on 1 and 3, since i haven't taken Physics in 5 years and i use to be pretty good at it. Try a Phyics category.

1.) A tank with a flat bottom is filled with water to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)
A. 4.0 kPa B. 9.8 kPa C. 18.9 kPa D. 39.2 kPa

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2. A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?
A. 5,362.56 N B. 6,150.64 N C. 6,700.56 N
D. 7,600.18 N

density = m/V
7840 = m/.08
m = 627.2kg

force = weight
W = m * g
W = 627.2 * 9.8

When i do this, i get 6146.56N

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3. When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of about
A. 0.15. B. 1.0. C. 1.3. D. 2.5.

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4.) If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be
A. lower than the mercury in the vessel, and shaped like the outside of an umbrella.

Not completely certain on this one.

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5.) How much time should be allowed for a 605-mile car trip if the car will be traveling at an average speed of 55 miles per hour?
A. 8.75 hours B. 9 hours C. 10.5 hours D. 11 hours

S = d/t
55 = 605/t
55t = 605
t = 605/55
t = 11 hours