Tasha has a mass of 20 kg and wants to use a 4.0 m board ofmass 10 kg as a seesaw. Her friends are busy, so Tashaseesaws by herself by putting the support at the systems center ofgravity when she sits on one end of the board. How far is shefrom the support point?
a force of 20N is required to move an object of mass 5kg at a constant speed of 10 m/s. how much work was done to move an object 50 m? what is happening to the energy supplied to the object? they are asking for the answer in Joules
A canoe has a velocity of 0.400m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.520 m/s east relative to the earth.Find the direction of the velocity of the canoe relative to the river.Express your answer as an angle measured south of west.
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 7.25 g of sodium carbonate is mixed with one containing 3.50 g of silver nitrate. After the reaction is complete, the solutions are evaporated to dryness, leaving a mixture of salts. How many grams of silver carbonate and sodium nitrate are present after the reaction is complete? Show your work.
You are considering the acquisition of a new piece of equipment with a useful life of five years. This new technology will make your clinical operation more efficient and allow for a reduction of 10 FTEs. The equipment purchase price is $4,500,000 plus 10% installation fee. The purchase price includes service for the first year, an item that has an annual cost of $10,000. There is a potential for additional volume of 150,000 units in the first year, growing by 30,000 each year thereafter. The price charged per unit is $15.00 with a 50% collection rate. The staff being eliminated are paid $12.50 per hour. The fringe benefits rate is 20%. The hurdle rate is 7.5%.
1. What is meant by benefit/cost ratio, average payback period and ROI. Why are they all important to understand when purchasing new equipment? Based on this information, would you pursue this opportunity? Explain your decision in 250 to 500 words in the text.
What is the initial temperature of a 30 g aluminum cube, if its equilibrium temperature when placed in 90 g of room temperature (20 degree celsius) water was 25 degree celsius ? (Caluminum=0.215 cal/g degree celsius). Please explain.
Can you show me how to answer this step by step.
A hiker leaves camp at 8 am on level terrain. At 9 am she is 5 km east of her starting point. At 10 am she is 2 km northeast (450 N of E) of where she was at 9am. At 11 am she is 5 km north of where she was at 10 am.
a) What is her displacement with respect to starting point?
b) What was her average velocity for the hike?
Lizzie Borden was tried and acquitted for the axe murders her father and stepmother in 1892. The murder weapon was actually a hatchet. The stepmother was killed by receiving 19 direct hits to the back of the head in her bedroom. The father was killed hours later downstairs when he struck 10 or 11 times with a hatchet- most likely when he was asleep. The investigators found a hatchet with a freshly broken handle in the cellar and believed it was the murder weapon. If you were the first officer on the scene what would suggest a hatchet was used in the murders when you looked at the bodies? (3 points) Based on your experience, describe how the evidence let you know two important characteristics in the psychology of the killer?
c/ based on the form of the bonding and anti bonding orbitals which atom A or B is more electronegative?
e/ what is the charge density in the bonding orbitals?? The anti bonding orbital??
For a heteronuclear diatomic molecule a bonding and antibonding molecular orbital w canbe approximately written as:Y BO = N BORO A +
[email protected]}" do = Nao t-1041+ $B}where @ and @g are two normalized atomic orbitals centered on nucleus A and Brespectively and No and Nso are normalization constants. The above form of thebonding and antibonding orbitals assumes that the atomic orbital overlap is negligible(i.e. SAB 0). The energy of these states is approximately given by:E = / Y’AV dtwhere ‘ can be the bonding or antibonding orbital.a)Normalize the wave functions. Remember that the atomic overlap integral is takento be 0.b)Show that the overlap between the bonding and antibonding orbital is zero. Hence,they are orthogonal.c)Based on the form of the bonding and antibonding orbitals which atom, A or B, ismore electronegative?d) Calculate the energy of the bonding and antibonding orbitals. Use the abbreviations:a, =fo’ Holdt, a, =fo’, Hour and B=ffHo,dt.e)What is the charge density in the bonding orbital? the antibonding orbital? (Thecharge density is simply the probability density multiplied by the electronic charge,e).
1) In a 55 s interval, 392 hailstones strike a glass window of area 0.888 m2 at an angle 40◦ to the window surface. Each hailstone has a mass of 7 g and speed of 6.9 m/s. If the collisions are elastic, find the average force on the window. Answer in units of N.Find the pressure on the window. Answer in units of N/m 2 .
2)Find the density of seawater at a depth where the pressure is 3200 atm if the density at the surface is 1040 kg/m3 . Seawater has a bulk modulus of 2.3 × 109 N/m 2 . Answer in units of kg/m3 .
3)
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