# Posts by Sam

Total # Posts: 5,191

**Life orientation**

Identify three courses or study fields I'm interested in following after grate 12 write them down and in order of preferences provide two reasons of each choice

**Physics**

A pool ball of mass 100g and velocity [5,-4]m/s collides with a stationary pool ball of the same mass. After the collision, the pool balls have velocites [2,-3]m/s and [3,-1]m/s. Is the collision elastic? Explain your answer.

**Physics**

A pendulum bob has a mass of 1kg. The length of the pendulum is 2m. The bob is pulled to one side to an angle of 10degree from the vertical. What is the velocity of the pendulum bob as it swings through it's lowest point? What is angular velocity?

**Physics**

A ball of mass 500g is kicked into the air at angle of 45degree. It reaches a height of 12m. What was it's initial velocity?

**science**

If a sheet of Tarpaulin (350gsm) 5m high 7m wide at a pitch of 45% with wind speed of 60mph what will be the upwards force (lift force)in Kg?

**MAth**

projectile is fired from the ground s=0 ft with initial speed of v=800 ft/sec at an angle of elevation 30 degrees State the vector function the projectile follow,projectile initial velocity vector,vector function,projectile speed function

**Math**

Look for a pattern and find the next two numbers in the sequence and then write a general version of the nth term. 1 2 3 4 5 6 7 8 n 18 30 42 54 66 78 I can recognize the pattern as being + 12 so under 7 my answer would be 90 and under 8 my answer would be 102, but how do I ...

**Math**

Look for a pattern and find the next two numbers in the sequence and then write a general version of the nth term. 1 2 3 4 5 6 7 8 n 18 30 42 54 66 78 I can recognize the pattern as being + 12 so under 7 my answer would be 90 and under 8 my answer would be 102, but how do I ...

**worldhistory 6th grade**

it is c trust me i took then test

**math.**

Write a function of x that performs the following operations: Raise x to the ninth power, multiply by 5, and then add 6. y=f(x)= (b) Find the inverse to the function you found in part (a). x=g(y)=

**physics**

Consider the system shown in the diagram. The pulley is a uniform cylinder with mass m3 = 0.60 kg and radius R = 4.0 cm, the other two masses are m1 = 2.5 kg and m2 = 1.0 kg, and á = 30o. Assume the rope is massless, there is no slipping of the rope on the pulley, and ...

**Chemistry**

Concentrated hydrochloric acid is 12 M. What is the molarity of an HCl solution prepared by diluting 10.0mL of concentrated acid to a total volume of 250.0mL?

**Chemistry**

How much concentrated 12 M HCl is needed to prepare 200 ml of a 2.5 M solution?

**Social Studies**

Is it D

**Social Studies**

I think it is the 3rd one i am not forsure

**Social Studies**

Why did democracy develop during the Roman Republic? Members of lower social classes began to demand representation in government. Romans wanted to prevent one leader from gaining too much power. Romans wanted to model their system of government after ancient Athens. Members ...

**Social Studies**

thank you

**Social Studies**

Which of the following is a example of how the government of the roman republic contribute to the democratic? It was based on a Dictatorship It was based on a tripartite system It was based on a triumvirate system It was based on a written set of laws I think it is the second one

**math**

7ft board is to be cut into three pieces, two equal-length ones and the third 99 in. shorter than each of the other two. If the cutting does not result in any length being lost, how long are the pieces?

**Physics**

A soccer ball of mass 550g is at rest on the ground. The soccer ball is kicked with a force of 108N. The player shoes is in contact with the ball for 0.3m. What is KE of the ball? What is the ball's velocity at the moment it loses contact with the soccer player's shoes?

**Math**

JASON DRIVES 50 MI TO A TRAIN and then continues his trip with a 210 mi train ride. the car travels 20 mph slower than the train. if total travel time is 4 hr, find the average speed of the car and the average speed of the train.

**math**

Given that f(x)=4x−3 and g(x)=4−x2, calculate f∘g(x)= g∘f(x)= THANKS

**Physics**

Rosie (mass 41 kg) pushes a box with a horizontal force of 140 N (31.472 lb) at a speed 25 m/min. A. What is Rosie’s power output? Answer in units of W. B.What energy is produced by a 300 W lightbulb lit for 4.1 hours? Answer in units of J

**Physics**

Zak, helping his mother rearrange the furniture in their living room, moves a 42.3 kg sofa 7.2 m with a constant force of 17 N. A. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J. B. What is the average acceleration of the sofa? Answer in units...

**physics**

A light beam in air strikes the surface of a liquid at an angle 23.6 degrees from the normal. The angle of refraction in the liquid was measured to be 15.8 degrees, calculate the index of refraction for the object? calculate the speed of light in the object?

**Social Studies**

I think it is B

**Social Studies**

How did this law lead to the development of democratic principles? 6-9. When the litigants settle their case by compromise, let the magistrate announce it. If they do not compromise, let them state each his own side of the case, in the comitium of the forum before noon. ...

**Physics**

Four masses (2kg 3kg 1kg and 2kg) are arranged on a square of side 1.2 m. What is the moment of inertia if the axis of rotation is at the center of the square? What is the moment of inertia if you make the axis of rotation through mass 2kg (this mass cannot contribute to ...

**Maths**

Rs means Rupees (meant for Indian currency)

**Maths**

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?

**math**

suppose a>0 and n is a positive interger. is (1/a)^-n = 1/a^-n ? explain your answer

**World History**

c. He wanted to rid Italy of the Bourbon monarch.

**statistics**

5 students go to school one of which is known to be late; in fact he is late 22% of the time. What is the probability that he will not be late for school.

**Physics**

A 20.0 m long uniform beam weighing 800 N rests on walls A and B, as shown in the figure below.(a) Find the maximum weight of a person who can walk to the extreme end D without tipping the beam.(b) Find the forces that the walls A and B exert on the beam when the same person ...

**Physics**

A sphere of mass 85kg is 12m from a second sphere of mass 65kg. A)what is the gravitational force of attraction between them?

**Physics**

Sally has a mass of 50.0kg and earth has a mass of 5.98X10^24kg. The radius of earth is 6.371x10^6m. A)What is the force of gravitational attraction between sally and earth? B)What is Sally's weight?

**Math**

Yay!

**Math**

Profit

**Math**

Income

**Math**

it 914 but is it profit or loss?

**Math**

A company reports the following income and expenses for a three-month period. What is the company's total profit or loss for the three month period? Great Reads Book Store Month Income Expenses ------------------------------------ June $12,458 - $10,968 July $10,396 - $10,...

**math**

So its A

**math**

which expression represents 5 less than y? A. y-5 B. 5-y C. y/5 D. 5y-1

**Math**

A round cake pan that is 2in deep and has a 7in diameter, plus a 6in by 9in rectangular cake pan that is 2in deep. Which of these pans has the larger volume and why?

**Chemistry**

For the reaction between ammonia and hydrochloric acid to produce ammonium chloride; What volume of ammonia is used (at 20 Celsius and 760mmHg) if 12.5gmof ammonium chloride are produced in the reaction? How many molecules of ammonia does this represent?

**Chemistry**

If the density of a gas is 1.2g/L at 745.torr and 20 Celsius, what is the molecular mass?

**Chemistry**

What is the density of NH3 at 800torr and 25 Celsius?

**Chemmistry**

Use this percentage to calculate the mass of fluorine (in g) contained in 54.0 g of copper (II) fluoride.

**Chemistry**

A 10.3g sample of an elemental gas has a volume of 58.4L at 758torr when the temperature is 2.5 C. Determine the identity of the gas.

**math**

the volume of a sphere is 4/3 pie radius squared. given that pie is 3.142 and radius is 7.3 calculate the volume of the sphere

**CHEMISTRY!!!! HELP**

3.) Calculate the mass of oxygen gas that can be produced in the decomposition of 5.55 g of silver oxide. This is what I did but is it right?... I need help with a few more btw to double check if i'm doing these right. So here is what I did: First: balance the equation 2 ...

**ChemistryHELP.PLEASE... TEST SOON**

TEST VERY SOON

**Chemistry**

Continue #2: So it says to : Calculate the mass of ammonia, NH3, that can be produced. Can someone explain how to derive to the answer? Please

**Chemistry**

1.) what mass of zinc is needed to completely react with 4.00 g of silver nitrate? 2.) If excess ammonium sulfate reacts with 22.5 g of calcium hydroxide according to the following unbalanced chemical equation: (NH4)2 SO4 + Ca (OH)2 → CaSO4 + NH3 + H2O Now, how do I go ...

**Chemistry Help please! (:**

Calculate the mass of oxygen gas that can be produced in the decomposition of 5.55 g of silver oxide. This is what I did but is it right?... I need help with a few more btw to double check if i'm doing these right. So here is what I did: First: balance the equation 2 Ag2 O...

**Math**

Thank you manny

**Math**

Find the difference. -24 - 5 =? A. -29 B. 29 C.-19 D.19

**Math**

Find the difference. -14 - (-16) =? A. 30 B. -30 C. 2 D.-2

**Math**

$7

**Math**

I think it is B

**Math**

which of the following is equivalent to (-2) - 5? A. -2 + (-5) B. -2 + 5 C. 2 +(-5) D. 2 - (-5)

**environmental engineering**

A lake receives 8 m3/s of inflow containing 0.3 mol/m3 of a chemical. The chemical reacts with a first order rate constant of 0.01 h-1. The outflow from the lake is also 8 m3/s. Assume there was no chemical in the lake at the beginning and volume of the lake is 106 m3. What ...

**environmental engineering**

Pesticide is applied to a 10 ha (hectare) field at an average rate of 1 kg/ha every month. The soil is regarded as 20 cm deep and well-mixed. The pesticide evaporates at a rate of 2% of the amount present per day and it degrades microbially with a rate constant of 0.05 day-1. ...

**Math**

Thank you niki

**Math**

Set the numbers from Greatest to least? 15%, 1/8, 0.2, 0.09

**math**

0.065

**math**

What is equivalent to 65%? Choose all the apply. 0.065 0.65 13/20 13/25

**algebra**

The loudness, L L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d d, from the source of the sound. Round to 3 decimal places. A person 15 feet from a jetski, it is 75 decibels loud. How loud is the jetski when the person is 47 ...

**algebra**

The time required to do a job varies inversely as the number of people working. It takes 5hr for 7 bricklayers to build a park well. How long will it take 10 bricklayers to complete the job? (round answer to 1 decimal place)

**Social Studies**

It says it in the (bible) New World Translation of the Holy Scriptures in Act 2:36 You can look at it on j w. o r g ignore the spaces

**Social Studies**

Which key figure in Christianity does this image represent? It is a picture of Jesus tided to a cross A. Peter B. Paul C. Jesus <---- D. God I know that it is Jesus but he never died on a cross, he died on a pole.

**Social Studies**

I think it is D but i am not for sure

**Social Studies**

What influence did the Greek epics written by homer have on roman culture? A. They led Roman historians to question their loyalty to the Roman gods. B. They caused Roman historians to disagree over the origins of Roman culture. C. They inspired Virgil to compose an epic poem ...

**Reading**

Thank you for the poem Ms.Sue

**Reading**

In adventures of Isabel the only one of Isabel's enemies who survives is a? A.the bear B. the witch C. the giant D. the doctor

**math**

Find the projection of u = <-5, 3> onto v = <1, 4>.

**Pre-cal**

For z1 = 4cis (7pi/6) and z2 = 3cis(pi/3), find z1 * z2 in rectangular form.

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check) ive been asking this question 4 times still no one answer . someone pls do .

**Physics**

Two capacitor plates are equally and oppositely charged. They are separated by 1.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...

**math**

is that a big deal? if it is , then im greatly sorry ....and could someone answer my question pls /display.cgi?id=1454771086

**math**

vf=10*a vf=sqrt(2ad) or 10a=sqrt2ad 100a^2=2*500*a a=10m/s^2 vf=10*10=100m/s

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check)

**Physics**

use s= ut +0.5at^2 give 500 = 0(t) + 0.5 (9.8)t^2 t = 10.10s

**Pre-cal**

What is the area of triangle ABC if a = 19, b = 14, and c = 23?

**Math**

Tom has taken 3 tests with an average of 88%. However, Tom really wants an A. To get an A, he has to have an average score of 93%. What score does he need on the final test to get an A? I just don't get it. Can someone walk me through the steps to get to the answer?

**Physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 12.8 m/s at an angle of 65.7° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed ...

**Physics**

a crate of weight fg is pushed by a force P on a horizontal floor. (a) the coefficient of static friction is us, and P is directed at angle theta below the horizontal. show that the minimum value of P that will move the crate is given by P=usFgsectheta / 1-ustantheta (b) find ...

**Math**

There are 40 cows and chickens in a farmyard. One quiet afternoon, Lola counted and found that there were 100 legs in all. How many cows and how many chickens are there? thx...

**Do I have enough time**

Oh yea if you have notes and know what you are going to talk about. Just go for it but make sure you get it done earlier next time

**math**

whats sets of number does the number 9/10 have?

**Science**

A storm with winds over 120/km/h that can last several weeks is a? A.Tornado B Hurricane C Jet Stream D Thunderstorm I think its hurricane am i right?

**Analytical chemistry**

The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if 0.122 grams of CdSO4 was ...

**math**

Mr. Dunn estimates he uses 3 gallons of gas over the course of a week. How many miles per gallon does his car get when he drives 105 miles?

**history plz help**

thanks @Reed you helped me look at the article in another perspective.

**history plz help**

I don't get what it accomplished... i have this right now The Louisiana Purchase encompassed 530,000,000 acres of territory in North America that the United States purchased from France in 1803 for $15 million.

**history plz help**

Can you guys help me get started with this, I really appreciate what your doing. @Ms. Sue @Reed

**history plz help**

During the early 1800s, the United States tried to make peace with other countries in order to grow and develop. Give an example of one of these peace efforts and briefly explain what it hoped to accomplish.

**physics**

I got 71.6*10^4?

**physics**

The speed of a space shuttle is 3.2×10^6 cm/s. Convert this into miles per hour (mph) using only 12 inches/ft, 60 seconds/min, 60 minutes/hour, and 1 inch = 2.54 cm. Factor Analysis must be used. Express your result to three significant digits and in scientific notation.

**math**

A cookie recipe calls for 3/4 of a cup of flour and makes one dozen cookies. How many cookies can you make if you have 10 cups of flour and want to use it all? I said 160 cookies. I used a proportion to solve this but is there another way to solve it?