The equation 10(x-1)(x-2)(x-3) = 1 has three real solutions a<b<c where a = , b = , and c = . Enter your answers with at least six correct digits beyond the decimal point. Hint: Ask what the solutions are if the right hand side is 0 instead of 1, and use Newton's ...
July 17, 2013
Three objects of same heat capacity with temperature T1=200 K, T2=400 K and T3=400 K exchange heat with each other. They are isolated from the rest of the universe. Find the highest possible temperature one of them can reach in kelvin.
June 4, 2013
pyhsic question for count iblis
iblis got the problem right. for those trying to use jiskha to cheat on the brilliant problems, there was a mistake made in the acceptable answers for this week's question.
May 22, 2013
A car with a mass of 1000kg is travelling at a constant velocity. The force from the engine is 200Newtons. Calculate the acceleration of the car using the formula f=ma. How long will it take this car to travel 0-60 mph (n.b. 1mph = 0.45m/s)
May 16, 2013
A massless spring, with K=425 N/m, is hung vertically with the bottom end of the spring at position Y.i. A 3.50 kg mass is attached to the bottom of the spring and allowed to fall and oscillate. A) How far below Y.i does the mass fall before coming momentarily to rest and ...
May 1, 2013
The planet Tralfamador is a planet of mass M and radius R, and very thin atmosphere (neglect air resistance). A magnetic rail gun has been mounted on the surface of Tralfamador at the North pole. A projectile of mass m is fired from the magnetic rail of gun with an unknown ...
May 1, 2013
Some communication satellites are put into a circular geosynchronous orbit in which the satellite remains above a certain position on the earth's equator as it orbits. Such a satellite would always be in the same position in the sky as seen from the transmitting or ...
May 1, 2013
C'mon @cheers!! get some rest :) 5A is not (0,-1), or (0,1/sqrt(K)) or (0,-1/sqrt(N)) xD It must be something very close to it... I think the answer is translating the grover algorithm to a Bloch Sphere and see how it moves around the surface :) At least, that is what 5B,c...
April 16, 2013
Hi PhysTech, I am reading an article from twistedoakstudios(at)com in /blog/Post2644_grovers-quantum-search-algorithm and doing some calculations... Seems cyclic, in a geometric view.
April 16, 2013
A plastic rod has been bent into a circle of radius R = 8.80 cm. It has a charge Q1 = +4.60 pC uniformly distributed along one-quarter of its circumference and a charge Q2 = -6Q1 uniformly distributed along the rest of the circumference. Take V = 0 at infinity. (a) What is the...
April 4, 2013
A circular loop of wire (radius = 6.0 cm, resistance = 40 miliamps) is placed in a uniform magnetic field that makes and angle of 30 degrees with the plane of the loop. The magnitude of the field changes with time according to B = 30 sin (20t)mT, where t is measured in s. ...
April 1, 2013
A coffee cup calorimeter contains 25.0 grams water at 23.8 C A 5.00g sample of an unknown metal at an initial temperature of 78.3 C was dropped into the calorimeter. The final temperature of mixture was 46.3 C. Calculate the specific heat of the metal. The specific heat of ...
March 19, 2013
Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-> PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and...
March 3, 2013
(a) LEFT For left hand or right hand rule, every extra digit requires 10 times of work. 4 digit needs 2 second. From 4 to 12, it has 8 digits. 2 * 10^(8) seconds / 60 /60 /24 /365 = 6.3 years (b) MID For midpoint rule, every 2 digit requires 10 times of work. 2 * 10^(8/2) /60...
February 25, 2013
Place twelve $1 bill and twelve $10 bill on the template. Than exchange bills so that the same amount of money is on the template using the fewest number of bills. Write the result in expanded form
February 20, 2013
Place twelve $1 bill and $10 bill on the template. Than exchange bills so that the same amount of money is on the template using the fewest number of bills. Write the result in expanded form
February 20, 2013
A sample of naphthalene, which should be pure white, was found to have a grayish color after the usual purification procedure. The melting point was correct, and the melting point range was small. Explain the gray color.
January 30, 2013
Obamacare will enable 32 million more Americans to have health insurance. Despite this coverage, medical sociologists know that there are other barriers besides health insurance that make it difficult for patients to seek medical care. Describe 3 such barriers to seeking care...
December 12, 2012
Central Middle School sold 50 tickets for one night of the school play. Student tickets sold for $2 each and adult tickets sold for $3 each. They took in $135. How many of each type of ticket did they sell?
November 7, 2012
A water trough is 4 m long and its cross-section is an isosceles trapezoid which is 210 cm wide at the bottom and 280 cm wide at the top, and the height is 70 cm. The trough is not full. Give an expression for V, the volume of water in the trough in cm^3, when the depth of the...
October 15, 2012
The slope of the tangent line to the curve y= 3x^3 at the point (-1,-3) is:? The equation of this tangent line can be written in the form y=mx+b where m is:? and where b is:?
October 15, 2012
You have been given the following information on a project: It has a 3-year lifetime The initial investment in the project will be $28 million, and the investment will be depreciated straight line, down to a salvage value of $6 million at the end of the fourth year. The ...
October 13, 2012
A truck is stopped at a stoplight. When the light turns green, the truck accelerates at 2.0 m/s2. At the same instant, a car passes the truck going 13 m/s. Where and when does the truck catch up with the car? _________m (from the intersection)
October 7, 2012
4. Point E is located at (2, 2) and point F is located at (4, 6). What is the distance between points E and F? a. square root of 52 b. square root of 28 c. 10 d. square root of 20 5. In which quadrant is the point (x, y) located if x is negative and y is positive? ...
October 3, 2012
If after precipitation of the Group I cations as chlorides by the reaction with HCl, nearly all of the precipitate dissolves in the hot water, what ion is most probably present and which ions are most probably absent?
July 22, 2012
the motion of a particle along a straight line is described by the function x=(2t-3)^2 where x is in metres and t is in seconds. A)find the position ,veocity and acceleration at t=2 sec. B) find the velocity of the particle at origin.
June 26, 2012
Find the forces exerted by the two supports of a 4.0m, 50-kg diving board when a 60-kg woman stands at its end. The two supports are 0.8m apart. This time consider the mass of the diving board.
June 24, 2012
A car starts from rest and travels for 6.3 s with a uniform acceleration of 2.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of −1.9 m/s2. If the brakes are applied for 2.6 s, how fast is the car going at the end of the braking period?
June 7, 2012