Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 67

**Physics**

An object with mass 3.0 kg is executing simple harmonic motion, attached to a spring with spring constant k =210 N/m. When the object is 0.23 m from its equilibrium position, it is moving with a speed of 0.72 m/s. (a) Calculate the amplitude of the motion. m (b) Calculate the ...

**physics**

a cannon with mass of 2,000 kg fires a 10 kg shell with a velocity of 200 m/s at an angle of 60 degrees above the horizontal. What is the recoil velocity of the cannon across the level ground?

**physics**

a 1500 kg car moving at 20 m/s strikes a truck waiting at a traffic light, hooking the bumpers. The two continue to move together at 10 m/s. What was the mass of the truck?

**physics**

a 1000 kg sports car accelerates from 0-30 m/s in 5.0 s. What is tge average power delivered by the automobile engine?

**PHYSICS**

You throw a 20-N rock vertically into the air from ground level. You observe that when it is a height 14.8m above the ground, it is traveling at a speed of 25.0m/s upward. A) Use the work-energy theorem to find its speed just as it left the ground. What is it? B) Use the work-...

**Physics**

A hammer of mass M is moving at speed v0 when it strikes a nail of negligible mass that is stuck in a wooden block. The hammer is observed to drive the nail a distance L deeper into the block. A) Find the magnitude F of the force that the wooden block exerts on the nail, assum...

**Physics**

You throw a 20-N rock vertically into the air from ground level. You observe that when it is a height 14.8m above the ground, it is traveling at a speed of 25.0m/s upward. A) Use the work-energy theorem to find its speed just as it left the ground. What is it? B) Use the work-...

**Physics**

A pump is required to lift a mass of 750kg of water per minute from a well of depth 13.2m and eject it with a speed of 17.4m/s. A) How much work is done per minute in lifting the water? B) How much in giving the water the kinetic energy it has when ejected? C) What must be the...

**Physics**

A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28 degrees below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25. (a) What magnitude of force must the ...

**Science**

(a) What magnitude of force must the worker apply? (b) How much work is done on the crate by this force? (c) How much work is done on the crate by frication? (d) How much work is done on the crate by normal force? (e) How much work is done on the crate by the gravity? (f) What...

**Science**

A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28* below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25.

**Chemistery**

A hot air balloon with a volume of 3.20 x 10^3 L and 120 moles of air is at a temperature of 20C. How many moles of air will the balloon contain if it expands to 4.80 x 10^3 L and the air is heated to 45C?

**Math**

Five pounds of birdseed is used to fill 4 identical bird feeders. A. What fraction of the birdseed will be needed to fill each feeder B. How many pounds of borked seed are used to fill each feeder? C. How many ounces of birdseed are used to fill three bird feeders?

**Science**

he specific heat of gold is 0.031 cal/g°C. Fifty grams of gold will require ____ calories to raise the temperature 1°C. 3.1 6.2 1.55 50

**trig**

If a flywheel 8 ft. in diameter rotates at 80 rpm., what is the linear velocity of a point on the outside edge, in feet per minute in terms of pi?

**Algebra**

I have only dimes, nickels, and pennies in my wallet. Seven of the coins are dimes, 25 percent are nickels and 5/9 of them are pennies. How many coins do I have?

**prealgebra**

change 40 miles per hour to miles per second

**elemetary elgabra**

A tree casts a shadow 25 m long. At the same time, the shadow cast by a 57-cm tall statue is 66 cm long. Find the height of the tree to the nearest meter.

**LSU **

Two point charges Q1 = -26.8 micro-Coulombs and Q2 = +38.5 micro-Coulombs are located on a vertical line with Q1 below Q2. The coordinates of Q1 is (0.0, -6.8 cm). The two charges are 28.6 cm apart. Determine the coordinates of the location where the net electric field due to ...

**math**

A set of scores with a normal distribution has a mean of 32 and a standard deviation of 3.7. Which score could be expected to occur the least often?

**trig**

Verify the trigonometric identity. Please show all steps. tanx-cotx/tanx+cotx=sin^2x-cos^2x

**chemistry**

How many liters of pure oxygen at STP is consumed by a human being in 24 hours if the human body requires daily energy that comes from metabolizing 816 grams of sucrose (C12H22O11)? C12H22O11(s ) + 12 O2(g) => 12 CO2(g)+11 H2O

**chemistry**

a quantity of gas is collected over water at 15C. The manometer indicated a pressure of 24.0kPa. what would be the pressure of the dry gas?

**chemistry**

what volume does 2.5 moles of carbon monoxide occupy at 50.5 kPa pressure and 20.0 C?

**chemistry**

A quantity of gas has a volume of 121 L when confined under a pressure of 2.50 atm at a temperature of 20.0 C. At what pressure will its volume be 30.0 L at 25.0 C?

**Chemisty**

When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are produced in this reaction? (R = 0.08205 L at...

**Math**

Lisa is painting a fence that is 26 feet long and 7 feet tall. A gallong of paint will cover 350 square feet. Write and solve a proportion to determine how many gallons of paint Lisa will need. Thanks, Ms. Sue for the last one...I got it!

**Math**

for every girl taking classes at the school, there are 3 boys who are taking classes at the school. If there are 236 students taking classes, write and solve a propotion to predict the number of boys taking classes at the school.

**Physics**

A 65-kg diver jumps off a 10.0-m tower. a) Find the diver's velocity when he hits the water. b) The diver comes to a stop 2.0m below the surface. Find the net force exerted by the water. I get the first part: sqrt(2ad), thus about 14 m/s downwards. For part b, I have... f ...

**algebra**

Which properties did Carmen use to solve the following problem? 17 + (45 + 23) 17 + (23 + 45) (17 + 23) + 45 40 + 45 85

**Physics**

poop

**Chemistry**

Based on the number of moles of H_2SO_4, determine the number of moles of Na_2CO_3 needed for the neutralization reaction. Sodium carbonate ( Na_2CO_3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 4.03×...

**Describe how you would make 250 mL of 0.500 M HCI**

How did you get 12.1 M HCI?

**Math**

If X=11 inches, Y=8 inches, and Z=6 inches, what is the area of the parallelogram above?

**Analytical Mechanics**

A car traveling at 100Km/hr smashes into a concrete abutment. Show that the collision is the equivalent to driving off the top of a ten story building. Allow 4 meter per story and neglect air resistance. Next, find the equivalent vertical height to represent the effect of a tw...

**Perimeter and area**

The gadget comes with a page of instructions. When page is unfolded, it is 81 square inches. If one page is nine inches wide what is the perimeter?

**Math**

$6.00-$4.50=$1.50 divided by 2 bags of popcorn gives you .75 cents.

**Math**

Hannah and Tyler count the number of times the word "what" occurs. Hannah's data has a mean of 2.7 times. What could Tyler's mean be if his results are similar?

**Chemistry**

75.0G *

**Chemistry**

Calculate the freezing point of each of the solution 75.0 of glucose,C6H12O6 , added to 9.30×10−2 of water.... Please help

**Chemistry**

and the equation is 2HCL+Na2CO3=2NaCl+H2O+CO2

**Chemistry**

what volume of 2.50 M HCl in liters is needed to react completly(with noting left over) with .750 L of 0.500MNacCO3

**Chemistry**

What is the boiling point of a solution made using 731g of sucrose, C12H22O11, in 0.250kg of water,h2o ?

**Chemistry**

Thank you!

**Chemistry**

Please help, if you can. If you have a Log (x) = -0.123 ..... What does x = ?

**Chemistry**

How many grams of Ni(OH)2 are produced from the reaction of 45.0mL of 1.75 M NaOH solution?

**science**

what is sparting?

**calculus**

A car is travelling at 90mph when its brakes are fully applied, producing a constant deceleration of 22 ft/sec2. Find the distance covered by the car before it comes to a stop. (Remember: 60 mph equals 88 ft/sec.)

**calculus**

If the graph of f passes through the point (1, 0) and the slope of the tangent line at(x, f(x)) is 4x − 3, find the value of f(2).

**Math**

Find the most general function f such that f′′(x) = 16 cos 4x .

**math**

find the equation (in standard form using only integers) for the line through (2, -5) that is parallel to 2x-3y=5

**science**

How do i read a solubility curve to answer a question like: at what temp will 50g of potassium nitrate complete saturate 100cm3 of water

**physics**

The answer is actually 14.72 m/s :) (the square root of 1.3*75/.45 = 14.72)

**Calc**

16

**algebra**

56 sandwiches 2 x as many as 1 st and 4 x as many as 1st

**Grammar**

re-posting answers to questions... The patient was returned to the recovery room in good condition. verb = returned , subject patient Physical examination showed marked irritability. physical examination = subject verb = showed,

**Grammar**

He was discharged on the fourth hospital day. verb = discharged, he= subject questions hopefully fixed and are correct now... After 24 hours in the hospital he was much improved. improved is a predicate adjective but now is the verb = was and the subject = he Repeated chest x-...

**Grammar**

Lungs were clear with an occasional cough. verb = were,lungs = subject He was discharged on the fourth hospital day. verb = discharged hospital = subject After 24 hours in the hospital he was much improved. improved is a predicate adjective but now is the verb = was and the su...

**Grammar**

Which are the simple subject and the verb? The child was treated with erythromycin. was=verb treated = subject. Cultures were taken of the throat. were = verb cultures = subject She was seen here, stabilized, and transferred to County Hospital. she = verb stabilized and transf...

**Math**

I need to find a composite number whose factorization has seven prime numbers. Then I have to write it using exponents

**3rd Grade Math**

Is 8,000 mL greater than or less than 7L

**Verbs (please answer all, don't give me a website)**

4. We have sewn them ourselves. have sewn is action verb, transitive verb. Is this correct! 6. Hillary will wear blue. will wear is action verb, intransitive verb. Is this correct.

**Verbs (please answer all, don't give me a website)**

4. We have sewn them ourselves. action verb, transitive verb. Correct? 6. Hillary will wear blue. action verb, intransitive verb. Correct/

**algebra**

I need to check & see if I understand this. 100,000 base 100 is 100 with an exponent of 5, right?

**MATH**

what relation is a doorstep to a doormat

**Algebra II**

Explain how you know that (n+1)^k -n^k has degree k-1 Notice that expanded the first term is n^k + 2n(k-1) and so on with diminishing powers of n. The second term is n^k so, subtracting the second from the first, the n^k term goes away, leaving the next highest power of n to b...

**can't figure it out**

-3d+1/3(6+3d)=-10 -3d + 2+d =-10 -2d=-12 d=6 -3d+2+d= -10 -2d+2= -10 just thought this step should be shown :) -2d= -12 d=6

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