Total # Posts: 181
A swimming pool is being emptied and the amount of water remaining in the pool after t minutes after emoting commences is given by: Time t (min) Volume V (L) 0 30000 20 28800 40 25200 60 19200 80 10800 Find the equation describing the volume of water remaining at any time. [...
October 30, 2016
homework help: social studies
Why were colonial minutemen so prepared for the arrival of the British in Concord? (Worth 2 points) When Washington saw the British, he fired three cannon shots sending a warning sign Paul Revere had warned villages that the redcoats were coming The Green Mountain Boys hid in ...
August 31, 2016
Draw a free body diagram with the force of 20N and with Fn and with fg and then find the acceleration with newton second law . When you find the acceleration you can plug it into kinematics equation : vf=vi+at to find final velocity
May 15, 2016
ki is the kinetic energy initial how much energy is there in the system in the form a speed at the beggining of the collision as you know there are two forms of mechanical energy ( kinetic energy and potential ) when the object is moving it has kinetic energy but when it ...
May 15, 2016
linear momentum p=mv lets say m1 =0.1 kg m2=0.4kg before collision pi=(m1. u1)+(m2 . u2) pi=(0.1 . 100) + ( 0.4.50) = 30 when they collide together pf= (m1+m2)vf since linear momentum is always conserved pi=pf pf= (m1+m2)vf =pf (0.1+0.4) vf = 30 vf=60m/s you are correct b) ...
May 15, 2016
calculus question ?
I just can't wrap my head around this. I don't know if this is true I just came to conclusion with this if the limit of x--> +/-inf = L (if the limit of x going to pos/neg infinity gives you a number L) does that mean that L is a horizontal asymptote ? if the limit ...
May 14, 2016
I am writing an essay Do you guys know a word that is more powerful than encourages for example : the author encourages us to feel like.... but I want a word more powerful that is like the author is forcing us to feel that way
May 9, 2016
Calculus quick question pls
Why is there no vertical asymptote on F(x) = x/(x^2+1) What i learned is that to find vertical asymptote you have to set the denominator To 0 and solve for x ? In that case I find that x=-1,1
April 24, 2016
HELP PHYSICS PLS :)
A 15 g bullet strikes and embeds in a 2.1 kg block suspended at the end of a 1.2 m string. After the collision the string rises to a maximum angle of 22 degrees to the vertical. what is the speed of bullet? what I did MASS OF BULLET = 0.015 KG i found the height of when it ...
April 20, 2016
= 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the spring unextended b) ...
April 16, 2016
PHYSICS PLS HELP ME EVERYONE
m1 = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the spring unextended ...
April 15, 2016
Calculus (30min before deadline help pls )
A street light is at the top of a 16 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 3 ft/sec. At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is 36 ft away from the ...
April 9, 2016
Which solution would best help control pollution in Lake Tai while keeping Wuxi strong? People should move away to make more parkland. Factories in Wuxi should limit their waste. ** Farmers should grow fewer crops. All factories in Wuxi should be closed.
March 9, 2016
physics help plz :)
A bicycle spins 10 revs in 5.7 sec. The radius of the wheel is 15 cm a drop of water is 0.3 grams. What height will the drop of water reach when it comes off the wheel?--- I know that I have to use the v=we equation and that grams need to be in kg. But I'm not sure exactly...
November 15, 2015
A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road exerts on the car? I think...
October 4, 2015
The question says: when .422 g of phosphorus is burned, .967 g of a white oxide is obtained. Determine the empirical formula of the oxide. I did the calculations and got that there would be 1 mole Phosphorus and 4.29 mol Oxygen. To get the empirical formula, I would need to ...
September 28, 2015
Hello , my name is Amelia and my daughter is really confused on her homework about quadrilaterals. Can you help explain it to her so that she can understand it better? Please answer ASAP. Thank you Amelia V.
May 7, 2015
An urn contains 4 red, 6 white, and 3 blue marbles. Three marbles are selected at random and without replacement. What is the probability that one of each color is selected? Give your answer as a decimal number, with 3 decimal places.
February 22, 2015
at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved
September 8, 2014
You pay 3.3 cents per minute for long-distance phone calls on your phone. Your phone bill is $3.40. Write and solve an equation to find the number of minutes m of long-distance calls you made. A. ; 103 minutes B. ; 11 minutes C. ; 83 minutes D. ; 10 minutes
April 23, 2014
Mr . X calls your office to see your employer, who has forgotten about the appointment and is now lunching at his club with an important overseas client. How would you deal with the situation?
March 15, 2014
Help! - Writeacher!!
Help!! Can you check my answers? 1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly* rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1...
March 12, 2014
Here's my work, but it wasn't the correct answer: The two half-reactions: Fe3+ + e- --> Fe2+ E = 0.77 V 2H+ + 2e- --> H2 E = 0 V You multiply the first one by 2, so it looks like the formula above: 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq). Ecell = 0.77 V lnKsp...
June 21, 2013
university of the south pacific
at high noon, the sun delivers 1000w to each square meter of a blacktop road.if the hot asphalt transfers energy only by radiation, what is it's steady-state temperature?
May 30, 2013
It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output delivered by the hydraulic ...
February 22, 2013
science-please help due first thing tommorw
the same alkali(sodium hydroxide)can be found in both hair gel and oven cleaner.explain why it is safe to put hair gel on your skin, but not on oven cleaner. plz help!Be as acurate as possible and it has to be an outstanding scientific explanation.
November 8, 2012
A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.
November 7, 2012
Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?________N (b) What is the weight of a 10....
November 7, 2012
An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale reads 265 N. Chriss...
October 22, 2012
007 (part 1 of 2) An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N 008 (part 2 of 2) If the same elevator accelerates downwards with...
October 22, 2012
An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N
October 22, 2012
Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hours in one week on the average, how many hours a day does she work if she works 5 days a week?
October 19, 2012
After a day of testing race cars, you decide to take your own 1502.5 kg car onto the test track. While moving down the track at 11.4 m/s, you suddenly accelerate to 30.2 m/s in 19.2 s. What average net force have you applied to the car during that time?
October 15, 2012
b) If the car is moving much faster than the heavier truck when they collide, what best describes the size (or magnitude) of the forces between the car and the truck? 1. Not enough information is given to pick one of these answers. 2. Neither exerts a force on the other; the ...
October 14, 2012
Consider the collisions between a car and a truck whose weight is much heavier than the car (M ≫ m). Friction is so small that it can be ignored. If they are both moving at the same speed when they collide, what best describes the size (or magnitude) of the forces ...
October 14, 2012
assume 8 males audition, one of them being Miles, 6 females audition, one of them being Jackie, and 4 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can these roles be filled if ...
September 10, 2012
Damaraland mole-rats are relatives of naked mole-rats. In their clans, too nonbreeding individuals of both sexes cooperatively assist one breeding par. Even so, breeding individuals in wild Damaraland mole-rat colonies usually are unrelated, and few suboordianes move up in the...
September 3, 2012
TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each ...
May 29, 2012
(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot spots in foods due to interference effects? 3 MHz
May 29, 2012
The operating potential difference of a light bulb is 120 V. The power rating of the bulb is 105 W. Find the current in the bulb and the bulb's resistance. Current 1 A Resistance 2 I got 0.916 for A and 115 for B but they are wrong
May 14, 2012
A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $ 3
May 14, 2012