course phy 231

This ends the first assignment.???~???P??w??

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assignment #003

003. Misc: Surface Area, Pythagorean Theorem, Density

qa areas volumes misc

12-31-2007

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15:11:06

`q001. There are 10 questions and 5 summary questions in this assignment.

What is surface area of a rectangular solid whose dimensions are 3 meters by 4 meters by 6 meters?

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RESPONSE -->

108

confidence assessment: 2

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15:13:06

`q002. What is the surface area of the curved sides of a cylinder whose radius is five meters and whose altitude is 12 meters? If the cylinder is closed what is its total surface area?

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RESPONSE -->

120

confidence assessment: 2

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15:15:08

`q003. What is surface area of a sphere of diameter three cm?

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RESPONSE -->

36

confidence assessment: 3

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15:18:04

`q004. What is hypotenuse of a right triangle whose legs are 5 meters and 9 meters?

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RESPONSE -->

106

confidence assessment: 2

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15:20:13

12-31-2007 15:20:13

`q005. If the hypotenuse of a right triangle has length 6 meters and one of its legs has length 4 meters what is the length of the other leg?

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NOTES ------->

.................................................?b?~?????{?a?l???

assignment #003

003. Misc: Surface Area, Pythagorean Theorem, Density

qa areas volumes misc

12-31-2007

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16:16:15

`q005. If the hypotenuse of a right triangle has length 6 meters and one of its legs has length 4 meters what is the length of the other leg?

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RESPONSE -->

52

confidence assessment: 2

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16:23:21

`q006. If a rectangular solid made of a uniform, homogeneous material has dimensions 4 cm by 7 cm by 12 cm and if its mass is 700 grams then what is its density in grams per cubic cm?

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RESPONSE -->

2.08 cubic cm

confidence assessment: 2

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16:32:59

`q007. What is the mass of a sphere of radius 4 meters if its average density is 3,000 kg/cubic meter?

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RESPONSE -->

750

confidence assessment: 0

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16:37:30

`q008. If we build a an object out of two pieces of material, one having a volume of 6 cm^3 at a density of 4 grams per cm^3 and another with a volume of 10 cm^3 at a density of 2 grams per cm^3 then what is the average density of this object?

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RESPONSE -->

17

confidence assessment: 0

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16:39:26

`q009. In a large box of dimension 2 meters by 3 meters by 5 meters we place 27 cubic meters of sand whose density is 2100 kg/cubic meter, surrounding a total of three cubic meters of cannon balls whose density is 8,000 kg per cubic meter. What is the average density of the material in the box?

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RESPONSE -->

confidence assessment: 2

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16:39:49

`q010. How many cubic meters of oil are there in an oil slick which covers 1,700,000 square meters (between 1/2 and 1 square mile) to an average depth of .015 meters? If the density of the oil is 860 kg/cubic meter the what is the mass of the oil slick?

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RESPONSE -->

confidence assessment: 2

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16:42:09

`q011. Summary Question 1: How do we find the surface area of a cylinder?

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RESPONSE -->

2pi (radius)r (height)h + 2pir^2

confidence assessment: 3

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16:43:29

`q012. Summary Question 2: What is the formula for the surface area of a sphere?

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RESPONSE -->

S = 4pir^2

confidence assessment: 3

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16:44:50

`q013. Summary Question 3: What is the meaning of the term 'density'.

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RESPONSE -->

density is mass per unit volume

d=m/v

confidence assessment: 3

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16:48:55

`q014. Summary Question 4: If we know average density and mass, how can we find volume?

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RESPONSE -->

mass/density=v

confidence assessment: 2

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16:50:04

`q015. Explain how you have organized your knowledge of the principles illustrated by the exercises in this assignment.

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RESPONSE -->

i used my knowlede of density, mass and volume and there formulas to figure out the answers to the problems presented

confidence assessment: 2

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assignment #001

001. Areas

qa areas volumes misc

12-31-2007

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16:55:05

`q001. There are 11 questions and 7 summary questions in this assignment.

What is the area of a rectangle whose dimensions are 4 m by 3 meters.

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RESPONSE -->

confidence assessment:

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16:55:28

`q001. There are 11 questions and 7 summary questions in this assignment.

What is the area of a rectangle whose dimensions are 4 m by 3 meters.

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RESPONSE -->

4l*3w=12

confidence assessment: 3

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16:58:09

`q002. What is the area of a right triangle whose legs are 4.0 meters and 3.0 meters?

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RESPONSE -->

6=1/2base*height

confidence assessment: 3

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16:59:32

`q003. What is the area of a parallelogram whose base is 5.0 meters and whose altitude is 2.0 meters?

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RESPONSE -->

10.0=base*height

confidence assessment: 3

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17:00:35

`q004. What is the area of a triangle whose base is 5.0 cm and whose altitude is 2.0 cm?

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RESPONSE -->

5=1/2base*height

confidence assessment: 3

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17:04:58

`q005. What is the area of a trapezoid with a width of 4.0 km and average altitude of 5.0 km?

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RESPONSE -->

20

confidence assessment: 3

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17:05:58

`q006. What is the area of a trapezoid whose width is 4 cm in whose altitudes are 3.0 cm and 8.0 cm?

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RESPONSE -->

28

confidence assessment: 3

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17:07:12

`q007. What is the area of a circle whose radius is 3.00 cm?

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RESPONSE -->

28.27 = pir^2

confidence assessment: 3

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17:13:32

`q008. What is the circumference of a circle whose radius is exactly 3 cm?

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RESPONSE -->

3

confidence assessment: 2

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17:15:22

`q009. What is the area of a circle whose diameter is exactly 12 meters?

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RESPONSE -->

144

confidence assessment: 3

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17:17:07

`q010. What is the area of a circle whose circumference is 14 `pi meters?

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RESPONSE -->

196

confidence assessment: 1

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17:19:00

`q011. What is the radius of circle whose area is 78 square meters?

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RESPONSE -->

19104

confidence assessment: 0

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17:20:16

`q014. Summary Question 3: How do we calculate the area of a parallelogram?

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RESPONSE -->

multiply base by height to get the area

confidence assessment: 3

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17:21:58

`q015. Summary Question 4: How do we calculate the area of a trapezoid?

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RESPONSE -->

1/2 ?h ?area + base

confidence assessment: 3

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17:22:38

`q016. Summary Question 5: How do we calculate the area of a circle?

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RESPONSE -->

area of circle is Pi ?r2

confidence assessment: 3

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17:24:38

`q017. Summary Question 6: How do we calculate the circumference of a circle? How can we easily avoid confusing this formula with that for the area of the circle?

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RESPONSE -->

pi *diameter of a cricle. to differentiate between the area and circumfereance of a circle, is that area involves radius while the circumference deals with the diameter

confidence assessment: 3

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17:26:13

`q018. Explain how you have organized your knowledge of the principles illustrated by the exercises in this assignment.

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RESPONSE -->

i tried to use what i know in finding an area of an object. either using its height, radius, base, altitude, etc

confidence assessment: 3

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