Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of 8.0 * 10^4 years Radium-226 has half life of 1.62 * 10^3 years Lead-210 has half life of 20.4 years. The rate constant for the decay of unstable nuclide X...
March 20, 2012
A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period? What is the power of the elevator motor during an upward cruise with ...
February 20, 2012
A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
February 19, 2012
A basketball player makes a jump shot. The 0.585 kg ball is released at a height of 2.14 m above the floor with a speed of 7.15 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.19 m/s. What is the work done on the ball by air resistance, a ...
February 19, 2012
is this correct?- math
find the domain of the real valued function; f(x) = sqrt(5 - (sqrtx)) my solution: 5 - (sqrt x) >=0 -(sqrt x) >= -5 (sqrt x) <= 5 x <= 25 (-infinity, 25] is this correct?
February 12, 2012
1.) The first person who requires your assistance is Tina the bearded lady. Tinas side job is to look after the elephants (she double majored at circus university.) a. Tina must fill the semi-circular trough shown above with peanuts. Tina knows that the store bought ...
February 11, 2012
Suppose that the current Bid-Offer on the Yen is $0.0089/¥ and $0.0091/¥, and the three-month forward is $0.0094/¥. 1. If you wish to hedge 10,000,000 Yen Obligation due in three months, what position would you take? Explain why. a. Buy Yen forward at $0.0089/¥...
February 7, 2012
Reporter: A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates running for mayor, governor, and senate seats shows that not one of them favors the...
February 4, 2012
if the isotonic solution in our body reduces like near to negligible then what would be the effect will it make on hematocrit concentration will it also become low and why?? please answer fast
November 30, 2011
Reasonableness. Use the clues to solve the. Riddle. I am between 24and34. You say my name when you count by twos from zero. You say my name when you count by fives from zero. What number am I? 20 21 22 23 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
November 22, 2011
The flag that Nico waves has an odd number in the ones place and an even number in the tens place. RED flag 25- blue flag 14- yellow flag-32-green flag 6--oranges flag--17
November 2, 2011
Destiny is using a nutrient solution to use in her garden.She places the powder in a watering can.Then she adds the water.Which would dissolve the powder the fastest? A.SHAKING THE CAN VIGOROUSLY B.STIRRING THE SOLUTION SLOWLY C.TILTING THE CAN CAREFULLY FROM SIDE TO SIDE D....
October 25, 2011
Not at all, my dad was involved in the accident. And no one was hurt, insurance info was exchanged and parties went home uncited. I'm just fascinated by the forces involved and very curious as to the physics causing the spinning effect . My dad says the Mercedes weighs as ...
October 7, 2011
People can learn lots of things from kids that are dying. The kids can show you sight, hearing, smell, taste, or touch to their death. They would show you all wisdoms in the world, and can teach you all about life if you can listen to them. For example in this story Alain ...
June 24, 2011
Can someone help me with this answer check if its right ok the question says After Reading discuss what you think people can learn from those who are dying? So i put Well people can learn a lot from kids that are dying. The kids can sense of their sight, hearing, smell, taste...
June 24, 2011
Phosphorous trichloride (PCl3) is produced from the reaction of white phosphorous (P4) and chlorine: P4(s) + 6Cl2(g) --> 4 PCl3(g) . A sample of PCl3 of mass 280.7 g was collected from the reaction of 70.86 g of P4 with excess chlorine. What is the percentage yield of the ...
March 23, 2011
Your sonic range finder measures the distance to a nearby building at 20m. The range finder is calibrated for sound traveling 343 m/s, but on this very cold day the speed of sound is only 309 m/s. How far away is the building?
March 15, 2011
Why am I getting error called that the renaming refractor cannot apply in this context when trying to change a name in the netbeans? And how should I solve it? Please tell me quickly. emergency I need to submit my project tomorrow
January 1, 2011
In "It Can't Be Helped," why does Mama destroy her dishes? a)She does not like the pattern on the dishes, which are chipped anyway. b)Most of the other dishes have been broken in the move. c)She doesn't want the dealer to take advantage of her family's ...
November 23, 2010
An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.16 s. Its average angular acceleration is 375 rad/s2. Obtain its final angular speed.
November 19, 2010
What is the balanced net ionic equation for the following reaction: 2 NH4Cl + Ba(OH)2 = 2H2O + BaCl2 + 2 NH3 i got 2NH4^+ +2OH- = 2H2O + 2NH3 but it keeps telling me i'm wrong
November 13, 2010
you have 8 moving boxes that you can use to pack for college. each box holds 15 lbs of clothing or 60lbs of books. let c be the number of boxes that contain clothing. write a function that gives the total pounds T of the boxes in terms of the number of boxes that contain ...
October 12, 2010
model rocket is launched straight upward with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration of 1.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? m (b) How long after lift-off does...
September 8, 2010
what's the question asking? the zeroes of the function? the domain? in this case, if you want to find the domain you have to factor the bottom (5-x)/[(x-3)(x-5)] and because you know the denominator cannot be zero because that will make the problem undefined, the domain ...
May 15, 2010
Assignment 3 1. Some games of strategy are cooperative. One example is deciding which side of the road to drive on. It doesnt matter which side it is as long as everyone chooses the same side. Otherwise, everyone may get hurt. Driver 2 Left Right Driver 1 Left 0,0 -1000...
March 1, 2010
The reaction of aqueous barium hydroxide and aqueous sodium sulfate is represented by the balanced net ionic equation. Ba2+(aq) + SO42-(aq) → BaSO4(s) Give the balanced ionic equation for the reaction. Include the states.
January 29, 2010
A race driver has made a pit stop to refuel. After refueling, he leaves the pit area with an acceleration whose magnitude is 6.0m/s 2 . After 4.0s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant speed of 70 m/s ...
January 6, 2010
A school sells tickets for a show, (a) adult tickets and (c) child tickets. 1) each adult ticket costs $8 and each child ticket costs $5. the total takings are 2300. Write an equation to represent this information. 2) solve algebraically the simultaneous equations to find the ...
January 1, 2010
for my history homework i need to make a leaflet or poster demonstrating different attitudes to war. im not sure what to do. i was going to make a poster with good and bad points. does this sound right? thanks:)
November 15, 2009
Calculate the equilibrium constant for the weak base CH3NH2, if a solution of the base with an initial concentration of 7.05×10-4 M has a [CH3NH3+] of 0.000379 M (make an exact calculation assuming that initial concentration is not equal to the equilibrium concentration...
April 26, 2009
One main difference between the Articles of Confederation and the U.S Constitution was that the Articles were very weak and the people had more power than the government while the Constitution gave more power to the government. Are there any other main differences? I ...
October 23, 2008