# Posts by tammy

Total # Posts: 677

**Chemistry**

How much volume in liters will 100.0 g of oxygen occupy at 100 degrees celcius and 100 atm pressure?

**science/health**

Also remember that digestion begins in the mouth. So you could focus on this as well.

**Science**

Help! What is s reflected ray

**Literature**

How does "A Rose for Emily" demonstrate that the act of going to war ensured the demise of Southern Aristocracy? I noticed that she didn't have to pay taxes at first because the colonel knew she couldn't pay them. Are there other proofs?

**physics**

A rectangular box of negligible mass measures 5m by 1m by .5m. How many kgs of mass can be loaded onto the box before it sinks in the water? V=5*1*.5 = 2.5m^3 density of water =1g/cm^3 =1000 kg/m^3 I also know that when the density of the mass is greater than the density of ...

**physics**

How much absolute (total) pressure must a submarine withstand at a depth of 120m in the lake. Give answer in kPa. (Use 10m/s^2 for g). h=120m p_water = 1 g/cm^3 = 1000 kg/m^3 p_atmosphere = 101.3kPa P_total = ? P_water =density *g*h =1000*10*120 =1200000Pa =1200kPa P_total =...

**physics**

A block of wood weighs 40 N in air and 30 N in water. What is the buoyant force exerted by water on the block? B = -F_g = B-F_g =30-40 = - 10N Is this correct?

**physics**

The density of gold is 19.3 x 10^3 kg/m^3. What buoyant force does a .6 kg gold crown experience when it is immersed in water? B=m_water*g =p_water*v_water*g =p_water*v_gold*g and to find v_gold =m/density and from there would p_water =1000kg/m^3?

**physics**

An ideal gas is kept under constant pressure of 1 atm. If initial temperature is 301K and the volume increases by 10% what is the final temperature of the gas? T2=? V1/V2= T1/T2 V1/V2= (301K)/T2 .10/1= (301K)/T2 Is the side with volume correct? The 10% part confuses me. Thanks...

**physics**

ideal gas is kept under constant pressure of 1 atm. If initial temperature is 301K and the volume increases by 10% what is the final temperature of the gas? T2=? V1/V2= T1/T2 V1/V2= (301K)/T2 .10/1= (301K)/T2 Is the side with volume correct? The 10% part confuses me. Thanks ...

**physics**

A solid object floats with three-fourths of its volume beneath the surface of eater. What is the object's density? Give answers in g/cm^3. p_o=? p_object/p_water = v_water/v_object p_o/(1 g/cm^3) = ? for the volume side would it be 3/4 so that p_o/(1 g/cm^3)=3/4?

**physics**

An object floats with half of its volume beneath the surface of the water. The weight of the displaced water is 2000N. What is the weight of the object? I'm confused by this problem. How would I go about solving this? My guess would be that the weight of the object is ...

**physics**

The density of gold is 19.3 x 10^3 kg/m^3. What buoyant force does a .6 kg gold crown experience when it is immersed in water? B=m_water*g =p_water*v_water*g =p_water*v_gold*g and to find v_gold =m/density and from there would p_water =1000kg/m^3?

**physics**

A block of wood weighs 40 N in air and 30 N in water. What is the buoyant force exerted by water on the block? B = -F_g = B-F_g =30-40 = - 10N Is this correct?

**physics**

How much absolute (total) pressure must a submarine withstand at a depth of 120m in the lake. Give answer in kPa. (Use 10m/s^2 for g). h=120m p_water = 1 g/cm^3 = 1000 kg/m^3 p_atmosphere = 101.3kPa P_total = ? P_water =density *g*h =1000*10*120 =1200000Pa =1200kPa P_total =...

**physics**

A rectangular box of negligible mass measures 5m by 1m by .5m. How many kgs of mass can be loaded onto the box before it sinks in the water? V=5*1*.5 = 2.5m^3 density of water =1g/cm^3 =1000 kg/m^3 I also know that when the density of the mass is greater than the density of ...

**Physics**

I added the speed for point B is that I can get part b). So how would I find the max speed?

**Physics**

A roller coaster car of mass 1000kg is riding along a track from point A to point C. (point A is 75m high, B is 50m high and C is 100m high, so that there are a total of three hills.) the final velocity at point C is 10m/s a) Assume no friction what is the speed of the car at ...

**Physics**

A roller coaster car of mass 1000kg is riding along a track from point A to point C. (point A is 75m high, B is 50m high and C is 100m high, so that there are a total of three hills.) the final velocity at point C is 10m/s a) Assume no friction what is the speed of the car at ...

**chemistry**

How do I figure out the mass of 1 M&M?

**SCI 275 Repost for Cindy**

conservation and preservation. Do you believe that humans can harvest forest resources in an environmentally friendly way? Or, should national forests be left in their natural state in which resources are not used to benefit humans? To which side are you inclined? Provide ...

**human resources**

Compliance with the law and Reliability. These are the two aspects of performance appraisal I need help on. 1. What are the special challenges in each area? 2. What would be the impacts on employees and employers if these challenges were not addresses?

**human resources**

two aspects of a performance appraisal from the following list. What are the special challenges in each area and what would be the impacts on employees and employers if the challenges were not addressed? o Strategic Relevance o Criterion Deficiency o Criterion Contamination o ...

**Physics**

Well isn't T = to the time of one revolution? So I took 3rev/2s to get 1.5s

**Physics**

A bike wheel rotates uniformly through 2 revolutions in 3 seconds. a) what is the period of the wheel's rotation? T=3rev/2s=1.5s b) what is the frequency of the wheel's rotation? (in Hertz) f=1/T =1/1.5 =.666Hz c) what is the angular speed of the wheel(provide answer ...

**physics**

A .5kg ball on the end of a string is revolving uniformly in ahorizontal circle of radius 1m. The ball makes 2 revolustion in a second. a) determine the linear (tangential) speed of the ball. For this part of the question would I do this: v=d/t =1m/.5s =2m/s b)determine the ...

**physics**

A car goes around a flat curve of radius 50m at a speed of 35mph. What must be the minimum coefficient of static friction between the tires and the road for the car to make the turn? r=50m v=35mph=15.65m/s F_sf=? I know that F+sf= (meu)(F_N) But the mass of the car isn't ...

**physics**

A car traveling 65mph rounds an 100m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve or radius 300m? (assume the same amount of friction between the car's tires and each road surface) first curve v=64mph= 29.05m/s...

**physics**

A 5kg object moves to the right with a speed of 2m/s. It collides in a perfectly elastic collision with a 2 kg object moving to the left at 5m/s.What is the total kinetic energy after the collision? In elastic collisions KE is conserved so KE_i =KE_f KE_f=1/2(5)(2)^2+ 1/2(2)(5...

**physics**

A 1 kg mass moving to the right at a speed of 10m/s collides head-on in a perfectly inelastic collision with a stationary 2kg mass. How much KE is lost during the collision? First I found V_f to be 3.3m/s then I found KE_i=1/2m_1v_1i^2 +1/2 m2V_2i^2 =1/2(1)(10)^2 +1/2(2)(0)^2...

**physics**

A car of mass 1500kg moves to the right along a level straight road at a speed of 25 mph. It collides directly with a stopped motorcycle of mass 150kg. What is the total momentum after the collision? p_initial = p_final m_1*v_1i +m_2*v_2i = m_1*v_1f + m_2*v_2f (1500)(11.17m/s...

**physics**

When a cannon fires a cannonball, the cannon will recoil backward because the a) energy of the cannonball and the cannon is conserved b) momentum of the cannonball and cannon is conserved c)energy of the cannon is greater than the energy of the cannonball d) momentum of the ...

**physics**

A ball of mass .3 kg is dropped from a height of 10m. Its momentum when it strikes the ground is? I know p=mv how would I find velocity for this problem? Thanks in advance for your help.

**Chemistry**

I am completely lost in chemistry. Everything the teacher says sounds like a different language to me and I am usually really good in the class. Can someone help me do this problem please? An element "E" is present as 10E (The 10 is like an exponent to the left of ...

**physics**

A 50kg skier pushes off the top of a hill with an initial speed of 5m/s. Neglect friction. How fast will he be moving after dropping 20m in elevation? I was wondering if i did this problem correct. PE + KE_f = KE_i mgh +1/2mv_f^2 =1/2mv_i^2 50(10)(20) + 1/2 (50)v_f^2 = 1/2(50...

**bio**

I think I got it carbohydrates lipids proteins nucleic acids correct? still haven't found the basic element yet. I think it is carbon, but can't find anything definte

**bio**

is the answer to my question monosaccharides, polysaccharides lipids proteins?

**Biology**

what are the 4 major polymers and their functions? is the major element that makes up many of the biological chemicals, carbon?

**Algebra II**

I'm not quite sure how to set this problem up. This is the first of the entire worksheet and I'm sure if I understand one problem I can finish the rest pretty easily. The problem states: When there is no wind, Amelia flies her plane from Oklahoma City to San Francisco ...

**physics**

what distance should you keep between you and the car in front of you if the traffic is moving at 65mph? Your reaction time is 1s, and both the cars can decelerate at the same rate. Include reasonable estimate for the length of the car (you don't want your bumper to end up...

**Physics**

what distance should you keep between you and the car in front of you if the traffic is moving at 65mph? Your reaction time is 1s, and both the cars can decelerate at the same rate. Include reasonable estimate for the length of the car (you don't want your bumper to end up...

**physics**

A football is kicked at 37degrees to the horizontal and it goes a distance of 98 yd. Ignore air resistance. a) what is the ball’s initial velocity? b) what is the vertical component of the ball’s velocity? c) what is the horizontal component of the ball’s ...

**physics**

Can an object's velocity change direction when its acceleration is constant? a) No this is not possible because it is always speeding up b) No this is not possible because it is always speeding up or always slowing down, but it can never turn around c) Yes it is possible ...

**physics**

what distance should you keep between you and the car in front of you if the traffic is moving at 65mph? Your reaction time is 1s, and both the cars can decelerate at the same rate. Include reasonable estimate for the length of the car (you don't want your bumper to end up...

**physics**

Which of the following statements is not true? a)the horizontal component of velocity cannot be larger than the total velocity b)the vertical component of velocity cannot be larger than the total velocity c)Neither horizontal nor vertical components of velocity cannot be ...

**physics**

A car is moving with constant velocity. Which of the following is true? a) the car travels the same distance in each second b) car's velocity increases by the same amount in each second c)car's velocity decreases by the same amount in each second d)car's velocity ...

**physics**

A car is moving with constant acceleration. Which of the following is true? a) the car travels the same distance in each second b) car's velocity increases by the same amount in each second c)car's velocity decreases by the same amount in each second d)car's ...

**physics**

when lightning strikes you can see it at a speed of 3x10^8m/s. But you hear thunder at about 340m/s in 70 degrees air temperature. a) If you are a mile away from lightning, how long of a delay is there? b) if the delay between the lightning and thunder were 1s how far away ...

**Physics**

You are sitting in your car at a traffic light at the foot of a 200 ft long ramp that will take you onto the interstate. If your cat can at best accelerate at 5 m/s^2 and the traffic on the interstate is moving at 65mph. will the ramp be long enough for you to reach that speed...

**Math riddle**

Ok, this is driving me crazy .Grandpa Grumps had just informed the local police that several children were rollerblading in his driveway. However, by the time Police Officer Nickham turned up, the children had gone and Grandpa Grumps couldn’t remember their faces. So ...

**Physics**

during a hockey game a puck of mass .3 kg is given an inital speed of 12m/s. it slides 50 m o the ice before stopping. Assume the puck decelerates at a constant rate. what is the coefficient of friction betweent the puck and the ice? I know that it would be a very small answer...

**Physics**

you lift a 10 N physics book up in the air a distance of 1m at a constant velocity of .5m/s. What is the work done by the weight of the book? a) +10 J b)-10 J c) +5 J d)-5 J 10 N is the force of gravity and to find work you do this: W=F_g(change in distance) (10N)(1m)= +10J so...

**Physics**

a packing ccrate slides down an incline ramp at constant velocity. Thus we can deduce that a) a frictional force is acting on it b) a net downward force is acting on it c) it may be accelerating d) it is not acted on by appreciable gravitational force with a constant velocity ...

**Physics**

A wooden block slides directly down an incline plane at a constant velocity of 6 m/s. What is the coefficient of kinetic friction if the plane makes an angle of 30 degrees with the horizontal? the coefficient of kinetic friction = force of kinetic friction/normal force. How ...

**Algebra II**

Bolivian coffee sells for $4.59 per pound, and Columbian coffee sells for $5.95 per pound. How many pounds of each coffee should be mixed to produce 4000 pounds of a mixture that will be sold for $5.10 per pound? I think this is a system of equations but I'm not sure. If ...

**Chemistry- To Bob Pursleyy**

Thank you sooo much, I was using grams of Molybdenum, so I looked up the mass of an electron and converted it and got the correct answer. I thought I didn't solve for V right, I'm amazed that I got that right. Thank you for your help!

**Chemistry- To Bob Pursleyy**

I am having a hard time on how to get V in wavelength= h/mv If I multiply by mv then I get W(mv)=h Then I get Wmv=h I divide by Wm and get V=h/Wm ...but that doesn't seem to work. My other question is if I am using the correct values. W (wavelength or lamda)= 7.11x10^(-11)...

**Chemistry**

Under appropriate conditions, molybdenum emits X rays that have a characteristis wavelength of 0.711 Angstrom. These X rays are used in diffraction experiments to dtermine the structures of molecules. How fast would an electron have to be moving in order to have the same ...

**Vocabulary**

I have gotten help from here before and I was hoping that another kind person could help me again, since I always get such helpful answers. I have written an essay and I have my ideas stated pretty well but I am adding the final touches to it. This include spicing up the words...

**Physics**

A .5kg ball hangs on a string attached to the ceiling. If the string is cut what forces act on the ball as it falls? Ignoring air resistance. Weight is one of the forces acting on the ball. Is there another force acting on the ball? I know there isn't tension, friction. Is...

**Physics**

Two books of masses m1=10kg and m2= 20kg are connected by a rope. The horizontal force on the more massive box is 900 N. Assume there's no friction. a) what is the acceleration of the more massive box b) Acclereration of the less massive box a) f=ma 900=20a a=45m/s^2 b) f=...

**Physics**

An example of a force which acts at a distance is a) tension b) weight c) friction d) normal force Isn't the answer c) the further an object goes the more resistance?

**Physics**

A stack of books rests on a level perfectly smooth surface. A force F acts on the stack and it acclerated at 3m/s^2. A 1kg book is added to the stack. The same force is applied and now the stack accelerates at 2m/s^2. What was the mass of the original stack? I think i would ...

**Physics**

A stone is thrown straight up. At the top of the path, the net force acting on it is (ignore air resistance) a) greater than its weight b) greater than zero, but less than its weight c) instantaneously equal to zero d) equal to its weight At the very top of the path wouldn'...

**Physics**

A constant net force acts on an object. Describe the motion of the object. a) constant acceleration b) constant speed c) constant velocity d) increasing acceleration I believe the answer would be a) constant acceleration. Given F=ma. Is this correct?

**Chemistry**

Unfortunately I was hit by the sweep of illnesses going around due to changing whether and missed school today. Thus I missed the notes in Chemistry leaving me completely confuzzled about tonights homework on Dimmensional analysis or Unit Factoring. I called a friend but she ...

**college class**

Consider the choices of Native Americans who decide to stay on their tribe's native land or reservation, and those who choose to relocate to a city. If you were presented with this decision, which would you choose and why? Please be sure to fully explain your answer in a ...

**Physics**

A projectile is launched from ground level with an inital velocity of 50 m/s at an angel of 60 degreess aove the horizontal. Use g=10m/s. What is the max height reached by the projectile? I used change in y=voyt +1/2at^2 =50(2.4) + 1/2(=10) (2.5)^2 =125-31.25 =93.75m I was ...

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the ...

**Physics**

a ball thrown horizontally from a point 40m above the ground,strikes the ground after traveling a distance of 9m. with what speed was it thrown? use g=10m/s^2 first i need to find the time so I used y=y_0 +v_0t +1/2at^2 -40=-1/2(10)t^2 t=8s then x=x_o+vt 9=v(8) v=1.125m/s Is ...

**Physics**

A projectile is shot horizontally at 30m/s from the roof of a building 100m tall. Use g=10m/s^2. Choose + vertical direction to be pwards. a) determine the time necessary fot the projectile to reach the ground below b) determine the horizontal distance from the base of the ...

**Physics**

A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth? b) How far does the jumper jump? for a) I got .001s as the answer which logically...

**Physics**

A plane flying horizontally at a speed of 50m/s and at an elevation of 160m drops a package. two seconds later it drops a second package. How far apart will the two packages land on the ground? a)100m b)162m c)177m d)283m i think the answer is a) I got 150m for the first ...

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the ...

**Physics**

A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth? b) How far does the jumper jump? for a) I got .001s as the answer which logically...

**Physics**

A projectile is shot horizontally at 30m/s from the roof of a building 100m tall. Use g=10m/s^2. Choose + vertical direction to be pwards. a) determine the time necessary fot the projectile to reach the ground below b) determine the horizontal distance from the base of the ...

**Physics**

A projectile is shot horizontally at 30m/s from the roof of a building 100m tall. Use g=10m/s^2. Choose + vertical direction to be pwards. a) determine the time necessary fot the projectile to reach the ground below b) determine the horizontal distance from the base of the ...

**Physics**

"from zero to sixty in 8 seconds" is a description of: a) average speed b) instantaneous speed c)average acceleration d) instantaneous acceleration I know for sure that a) and c) aren't the right answers since average is over a long time period or the whole trip...

**Physics**

Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. make a statement concerning its acceleration. a) the car is decelerating and its acceleration is positive b)the car is decelerating and its acceleration is negative c...

**Physics**

A car starts from rest and accelerates at 5m/s^2 for 4s, then maintains that velocity for 3 seconds and then decelerates to a rate of 2m/s^2 for 3 seconds. How far does the car travel? I would have to add the total distance throughout the trip. And to find the distance I would...

**Physics**

On a postition versus time graph to find the acceleration you would simply find the area under the graph right? and how would you figure out whether acceleration is increasing, decreasing, constant of unknown from a graph? My guess is that the accereration is constant throughout.

**Physics**

A small mailbag is releassed from a helicopter that is ascending steadily at 5m/s. After 2s. a) what is the speed of the mailbag? b) how far is it below the helicopter? a) would I use v=v_0 +at v=5m/s + 9.8m/s^2(2s) v=24.6 m/s is this the correct speed of the mailbag? For b) i...

**Physics**

Killer whales at Sea Worl routinely jump 8 m above the water. What is their speed as they leave the water to achieve this? I know that h=8m v=? Would I use h=h_0 + v_0t = 1/2 at^2 but the problem would be that I also don't know the time. I am confused about which equation ...

**Physics**

Three vectors, each have a magnitude of 30 units, have their tails at the same oint and are directed 120 degrees from each other. Make a statement concerning the sum of these three vectors. a) the sum vector is 0 b) the sum vector is greater thatn 30 c) the sum vector is equal...

**Physics**

The sum of 2 vectors is the smallest when the angle between them is : a) 0 b) 45 c) 90 d) 180 d) i believe is the correct answer but i'm not sure exactly. Thanks in advance for your help.

**Physics**

Which of the following is an accurate statement? a) a vector cannot have zero magnitude if one of its components is not zero b) the magnitude of a vector can be less than the magnitude of one of its componenets c) if the magnitude of vector A is less than the magnitude of ...

**inb-check this please**

thank you

**inb-check this please**

Developed country partners in countertrade contracts have had problems with quality and timely delivery of goods from the developing country partners. How are they trying to deal with those problems? 1999, 12 of the 15 European Union (EU) member-countries agreed to begin a ...

**inb**

Developed country partners in countertrade contracts have had problems with quality and timely delivery of goods from the developing country partners. How are they trying to deal with those problems?

**Physics**

A car starts from rest and undergoes uniform acceleration. During the first second it travels 6 m. a) what is the car's acceleration? b) How far will the car travel during the third second? For a) I used v= v_0 +at 6=0 a*1 so a= 6m/s^2 For b) I used d=vt d=6(3) = 18 m Did ...

**Physics**

A car starts from rest and accelerates at 5 m/s^2 for 4 s, then maintains that velocity for 3 seconds, then decelerates at the rate of 2m/s^2 for 3 seconds. a) what is the final speed of the car? b) how far does the car travel? a) v = v_0 +at = 0+5(4)= 20m/s =0+5(3)= 15m/s =0+...

**Physics**

You are driving home on a weekend from school at 65mph for 130 miles. It then starts to snow and you slow to 45 mph. You arrive home after driving 4 hours. How far is your hometown from school? First I found the time with d/v=t so 130/65= 2 hours I used d= d_0 +vt =130 +45(6...

**Physics**

A car with good tires on a dry road can decelerate at about 5 m/s^2 when breaking. Suppose a car is initially traveling at 65 mph. What is the stopping distance?(give answer in meters and in feet) I changed 65mph into 29.05m/s. so I would use d-d_0 = (v^2 -v_0^2)/2a and when I...

**Physics**

You are driving home on a weekend from school at 65mph for 130 miles. It then starts to snow and you slow to 45 mph. You arrive home after driving 4 hours. How far is your hometown from school? First I found the time with d/v=t so 130/65= 2 hours Then I used d= (v-v_0)/(t-t_0...

**Physics**

A car starts from rest and accelerates at 5 m/s^2 for 4 s, then maintains that velocity for 3 seconds, then decelerates at the rate of 2m/s^2 for 3 seconds. a) what is the final speed of the car? b) how far does the car travel? a) v = v_0 +at =0+2(3)= 6m/s Would I use the part...

**Physics**

A car starts from rest and undergoes uniform acceleration. During the first second it travels 6 m. a) what is the car's acceleration? b) How far will the car travel during the third second? For a) I used v= v_0 +at 6=0 a*1 so a= 6m/s^2 For b) I used d=d_0 +v_0t + 1/2 at^2...

**Physics**

If you are driving at 65mph along a straight road and you look to the side for 2 seconds, how far do you travel during this inattentive period? (Give the answer in meters and in feet) Would i use d= d_0 + vt to solve this problem or would I use another equation? When i used ...

**Physics**

Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled. a) the displacement is either greater than or equal to the distance traveled b)the displacement is always equal to the distance traveled. c)...

**Physics**

When is the average velocity of an object equal to the instantaneous velocity? a) always b)never c) only when velocity is constant d)only when velocity is increasing at a constant rate c) would be the answer since you could cross out a). I do know that instantaneous velocity ...

**Physics**

a car manufacture advertise that a car goes "from zero to sixty in 8 seconds" is a description of: a) average speed b) instantaneous speed c) average velocity d) instantaneous acceleration a) and b) are incorrect since it's a change in velocity, whcih means it&#...