# Posts by Stefan

Total # Posts: 29

**math**

Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is D(T)=-1.5|T-8|+9. which analysis of the formula is true? A. Skip is 9 feet from the wall and the ball will return to him in 1.5 ...

*May 30, 2016*

**History**

These questions didn't come from the the text. The teacher was saying them out loud and we were supposed to write them down. He got them from our test. I'm confused with the third question too, my step dad said the same thing. I think I found the answers for the 4th ...

*March 20, 2016*

**History**

I've been looking for the answers to questions on my study guide for a test I will have for a couple hours and I got a lot of them. However, there are some that I still have a hard time finding. Here are the questions. If I can be told even some of these, that would be ...

*March 20, 2016*

**maths**

out of 10 litre a milkman sells some milk at the rate of Rs 15 perlitre and some at the rate of 12 per litre . He gets Rs 141 on selling it. Find the quantity of milk he sold at each rate.

*January 25, 2016*

**maths**

ans x=130 and y=145 is it right pls help me

*January 25, 2016*

**maths**

i don't know pls help me

*January 25, 2016*

**maths**

15x + y = 0 ---------- 1 x1 x + y = 275 -------- 2 x15 15x + y = 0 15x +15y = 4125 - - - ---------------------- 0 -14y = -4125 y = -4125 -14

*January 25, 2016*

**maths**

15x + y = 0 x + y = 275

*January 25, 2016*

**maths**

suresh scored 15 mareks more than ramesh in maths.if the sum of their marks in maths is 275.write the statement in linear equation in two variables

*January 25, 2016*

**maths**

PQR is an interior triangle within triangle PST. QR runs parallel to ST.

*July 8, 2014*

**maths**

QR is parallel to ST and PQ:QR = 2:1. Given the area of triangle PST is 18cm2, the area of triangle PQR in sq cm is?

*July 8, 2014*

**Chemistry (My previous post lacked something)**

Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. The question is in 4 parts. I just need the first: a)What mass of oxygen is necessary for this reaction? So far I've got 2.15 L x 1 mole /22.4 L But when I try to do the mole ratio, ...

*January 14, 2014*

**Chemistry**

So I have the balanced equation: c3H8 +502 = 3C02 +4H20 Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. So I've got 2.15 L x 1 mole /22.4 L But when I try to do the mole ratio, I don't know what to do since the 2.15 L is of ...

*January 14, 2014*

**Science**

a sample of an unknown metal has a mass of 21.6g and a volume of 8.00cm^3 . calculate the density of the unknown metal

*February 23, 2013*

**math**

come si fanno le frazioni di un numero

*November 2, 2011*

**Physics**

Microwaves of wavelength 4.50 cm enter a long, narrow window in a building that is otherwise essentially opaque to the incoming waves. If the window is 36.5 cm wide, what is the distance from the central maximum to the first-order minimum along a wall 6.70 m from the window?

*April 14, 2011*

**Physics**

A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the ends of the ...

*March 21, 2011*

**Physics**

An eight turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm. The coil lies in the plane of the screen and has a 6.10 A current flowing clockwise around it. If the coil is in a uniform magnetic field of 2.07 10-4 T directed toward ...

*March 10, 2011*

**Physics**

An eight turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm. The coil lies in the plane of the screen and has a 6.10 A current flowing clockwise around it. If the coil is in a uniform magnetic field of 2.07 10-4 T directed toward ...

*March 10, 2011*

**College Physics**

A charge of -3.10 nC and a charge of -6.65 nC are separated by a distance of 80.0 cm. Find the position at which a third charge of +7.10 nC can be placed so that the net electrostatic force on it is zero.

*January 19, 2011*

**College Physics**

A charge of -3.10 nC and a charge of -6.65 nC are separated by a distance of 80.0 cm. Find the position at which a third charge of +7.10 nC can be placed so that the net electrostatic force on it is zero.

*January 19, 2011*

**Physics**

Thanks for your help! I got the correct answer

*December 4, 2010*

**Physics**

By taking 3.87E9/4.18 then dividing it by the flow rate of the water (1.0E6 kg/s = 1.0E9 g/s)

*December 4, 2010*

**Physics**

Thanks for your help. For the answer I got it to be 0.925837321 by following your directions. When I submitted it to my online homework it said the answer was wrong and off by more than 10%.

*December 4, 2010*

**Physics**

A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 31%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in temperature of the flowing water?

*December 4, 2010*

**Physics**

In one cycle a heat engine absorbs 530 J from a high-temperature reservoir and expels 310 J to a low-temperature reservoir. If the efficiency of this engine is 55% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high temperature in the ...

*December 4, 2010*

**question...biographies**

Which is the MOST important literary element in biographies? A.Plots B.Characters C.Settings D.Point of view I believe is characters...but I just want to make sure with some one.

*December 10, 2008*

**chemistry**

42... It's always 42

*November 11, 2008*

**math**

655555

*February 15, 2007*

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