Wednesday
April 1, 2015

Posts by allan


Total # Posts: 74

physics
a window air conditioner is estimated to have a cost of operation of $50 per 30 days. this is based on the assumption that the air conditioner will run half of the time and that electricity costs $.090 per kWh. determine how much current the air conditioner will take from a ...
March 30, 2015

physics
A truck travels 1710 m uphill along a road that makes a constant angle of 5 . 08 ◦ with the horizontal. Find the magnitude of the truck’s horizontal component of displacement. Answer in units of m.
January 19, 2015

physics
A submarine dives 196.0 m at an angle of 18.0 ◦ below the horizontal. What is the horizontal component of the submarine’s displacement? Use the coordi- nate system where positive x is to the right and positive y is up. Answer in units of m.
January 19, 2015

physics
A 18 kg block is dragged over a rough, hor- izontal surface by a constant force of 131 N acting at an angle of 27 ◦ above the horizon- tal. The block is displaced 15 . 7 m, and the coefficient of kinetic friction is 0 . 125. The acceleration of gravity is 9 . 8 m / s 2 ....
January 19, 2015

physics
Consider two vectors ~ A and ~ B and their re- sultant ~ A + ~ B . The magnitudes of the vectors ~ A and ~ B are, respectively, 13 . 2 and 6 . 1 and they act at 110 ◦ to each other.Find the magnitude of the resultant vector ~ A + ~ B .
January 19, 2015

physics
Wayne exerts a force of 70.9 N to pull a 409 N sled along a snowy path using a rope that makes a 48◦ angle with the ground. The sled moves 19.9 m in 4.3 s. What is Wayne’s power? Answer in units of W. PLEASE HELP!
January 17, 2015

physics
Wayne exerts a force of 70 . 9 N to pull a 409 N sled along a snowy path using a rope that makes a 48 ◦ angle with the ground. The sled moves 19 . 9 m in 4 . 3 s. What is Wayne’s power? Answer in units of W.
January 17, 2015

physics
A mechanic pushes a 2520 kg car from rest to a speed of v , doing 4310 J of work in the process. During this time, the car moves 22.4 m. Find the speed v . Neglect friction between car and road. Answer in units of m/s.
January 14, 2015

physics
In the 1950’s, an experimental train that had a mass of 36700 kg was powered across a level track by a jet engine that produced a thrust of 4.67×10^5 N for a distance of 528 m. Find the work done on the train. Answer in units of J.
January 14, 2015

physics
A crate is pulled up a rough incline. The pulling force is parallel to the incline. The crate is pulled a distance of 6 . 92 m. The acceleration of gravity is 9 . 8 m / s 2. What is the magnitude of the work is done by the gravitational force? Answer in units of J
January 14, 2015

physics
The student’s body is 22% percent efficient; that is, for every 22 J that are converted to mechanical energy, 100 J of chemical energy are expended, with 78 J going into thermal energy. How much chemical energy is expended by the student during the climb? Answer in ...
January 12, 2015

physics
Two 4.6 g bullets are fired with speeds of 36.9 m/s and 74.8 m/s, respectively. a) What is the kinetic energy of the first bullet? Answer in units of J. b) What is the kinetic energy of the second bullet? Answer in units of J. I got part A), which is 3.131703J but i cant get ...
January 7, 2015

physics
A tugboat pulls a ship with a constant net horizontal force of 5.72 × 103 N and causes the ship to move through a harbor. How much work does the tugboat do on the ship if each moves a distance of 3.11 km ? Answer in units of J.
January 6, 2015

physics
A 18.4 kg block is dragged over a rough, horizontal surface by a constant force of 126 N acting at an angle of 34.1 ◦ above the horizontal. The block is displaced 20 m, and the coefficient of kinetic friction is 0.123. The acceleration of gravity is 9.8 m/s 2 .Find the ...
January 6, 2015

physics
A block at rest. The coefficients of static and kinetic friction are .75(Static) and .64(Kinetic). The acceleration of gravity is 9.8m/s^2 and the mass is 46kg. I've solved for the frictional force which is, 252.0841609N. Though what is the largest angle which the incline ...
December 14, 2014

physics
Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 376 N to the right. If they pull in opposite directions, the raft experiences a net external force of 162 N to the left. Draw a free body diagram ...
December 4, 2014

physics help PLZ!!
What is the direction of the net external force on the crate (as an angle between −180◦ and 180◦ , measured from the positive x axis with counterclockwise positive)? Answer in units of ◦ Ive solved for the net external force in the x and y direction. Fx...
December 4, 2014

physics
A crate is pulled to the right with a force of 93.5 N, to the left with a force of 116.8 N, upward with a force of 658.1 N, and downward with a force of 248.6 N. What is the net external force in the x direction? Answer in units of N
December 4, 2014

physics
A quarterback throws the football to a stationary receiver who is 22.7m down the field. the football is thrown at an initial angle of 39 degrees to the ground. The acceleration of gravity is 9.81m/s^2. a) at what initial speed must the quarterback throw the ball for it to ...
November 6, 2014

physics
For the ballistic missile aimed to achieve the maximum range of 15500 km, what is the maximum altitude reached in the trajectory? Answer in units of km
November 6, 2014

physics
An artillery shell is fired at an angle of 86◦ above the horizontal ground with an initial speed of 1630 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min
November 6, 2014

physics
A pelican flying along a horizontal path drops a fish from a height of 3.3 m. The fish travels 7.6 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s
November 6, 2014

Chemistry
Can anyone name the following alcohol H3C-CH2-CH2-CH2-OH
June 2, 2014

Physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 18, 2013

Algebra
A fireman leans a 40-ft long ladder up against a building. The base of the ladder creates an angle of elevation of 32 degrees with the ground. How far is the base of the ladder from the base of the building? Round to the nearest whole foot, if necessary.
May 19, 2013

Chemistry
An equilibrium that would favour the products is A. NH4+(aq) + H2PO4-(aq)= NH3(aq) + H3PO4(aq) B. HCN(aq) + HS-(aq)= CN-(aq) + H2S(aq) C. HCO3-(aq) +,HBO3 2-(aq)= H2BO3-(aq) + CO3 2-(aq) D. HSO4-(aq) + HSO3-(aq)= H2SO3(aq) + SO4 2- (aq) The answer is C. But I don't ...
January 29, 2013

Chemistry
An equilibrium that would favour the products is A. NH4+(aq) + H2PO4-(aq)= NH3(aq) + H3PO4(aq) B. HCN(aq) + HS-(aq)= CN-(aq) + H2S(aq) C. HCO3-(aq) +,HBO3 2-(aq)= H2BO3-(aq) + CO3 2-(aq) D. HSO4-(aq) + HSO3-(aq)= H2SO3(aq) + SO4 2- (aq) The answer is C. But I don't ...
January 29, 2013

Chemistry
In the chlor-alkali process, the mass of NaCl(s) required to produce 0.793 kg of chlorine gas is _____ kg.
January 28, 2013

Science
In the chlor-alkali process, the mass of NaCl(s) required to produce 0.793 kg of chlorine gas is _____ kg.
January 28, 2013

Pre-Calc
Two lookout towers on Mount Abraham and Snow Mountain are 29 miles apart. A fire warden in each tower sees a forest fire. From Mount Abraham the angle formed with the line of sight to the fire and the line of sight to the other tower is 44 degrees. From Snow Mountain the fire ...
December 11, 2012

capacitors
how would you carry out a suitable test to determine the relationship between voltage and current when charging and discharging a capacitor
December 2, 2012

math
caleb and winona both travel by car to their friend's home. The distance winona traveled was 124 miles less than twice the distance caleb traveled. If winona traveled 628 miles, how far did caled travel?
April 30, 2012

physics
A wire of radius one meter is centered on the origin in the xy plane. This wire carries a total charge of +Q. Another wire of length two meters runs along the z-axis and is centered at the origin. It carries total charge -Q. What is the electric field vector at any point on ...
April 20, 2012

physics
A source of instantaneous potential V = 10sin(50pi t) is connected across a capacitor of capacitence 1 times 10power negative 6 F. calculate the maximum value of the current and phase difference between the current and the potential difference?
April 18, 2012

Proofs Geometry
What is the statement and the reason for Given: and mEGF∠=60 mAGF∠=°90; Prove: mAGB∠=°30. Thank you!
November 13, 2011

Chemistry
Hi Everyone, Please Give me two examples of organic compound that have two different functional side groups groups. Please list the functional side groups for each organic compound.
November 10, 2011

Math Linear Algebra
Find the inverses of the matrices. Let A = 1 2 5 12 b1 = -1 3 b2 = 1 -5 b3 = 2 6 b4 = 3 5 Find A^-1, and use it to solve the four equations. Ax = b1, Ax = b2, Ax = b3, Ax = b4
October 5, 2011

Linear Algebra
Find the inverse of the matrices if they exist. Use the algorithm introduced in this section. 1 2 -1 -4 -7 3 -2 -6 4
October 5, 2011

Linear Algebra
Find the inverse of the matrices, if they exist. Use the algorithm introduced in this section. 1 2 -1 -4 -7 3 -2 -6 4
October 2, 2011

Chemistry
What must be the molarity of an aqueous solution of trimethylamine, (CH3)3 N, if it has a PH=11.20?
October 2, 2011

IT
Can anyone tell me which WIMAX system you would use for last mile broadband ? with a link to a town the miles away ??? Mobile or fixed ??? Thnks
June 28, 2011

science
asprin (C9 H8 O4) is produced by the rection between salicylic acid (C7 H6 O3) and acetic anhydride(C4 H6 O3). Calculate the maximum mass of aspirin that can be obtained if you mix 50g of each of the reactants. The chem.equation for the reaction is as f.f C7 H6 O3(s) + C4 H6 ...
May 9, 2011

10th Grade Chemistry
SiH4
February 17, 2011

Electr. and Magnetism
1) A charge of 80nC is uniformly distributed along the x-axis from x= 0 to x= 2.0m. Determine the magnitude of the electric field at a point on the x-axis with x=8.0m. a] 30 N/C b] 15 N/C c] 48 N/C d] 90 N/C e] 60 N/C 2) 3 point charges, 2 positive and one negative, each ...
January 31, 2011

math
vijay has 1/20 of a dollar in his pocket. what coins might he have?
January 18, 2011

calculus
a particle moves along the x-axis in such a way that its acceleration at any time t is given by a(t)= 6t - 18. At time t = 0, the velocity v(t) = 24. and at time t = 1, the position x(t) = 20 i have to find the expression for the velocity and what values t is at rest
December 9, 2010

english
where is the adjectives and the adverbs in the following paragraphe at the time lorraine hansberry was the yongest american playwriter ,the first woman ,and the first african american to receive the honor . her much celebrated play was A Raisin in the Sun.
October 31, 2010

physics
B=μ0I/2πr B1 = (4π×10^7)(8.0A)/(2π×0.030m) B2 = (4π×10^7)(-8.0A)/(2π×0.150m) BA = B1 + B2 B1 = (4π×10^7)(8.0A)/(2π×0.060m) B2 = (4π×10^7)(-8.0A)/(2π×-0.060m) BB = B1 + B2
September 21, 2010

french
microwave in french
June 14, 2010

college
The diameter of a wire should be 8 cm. It follows a normal distribution and has a standard deviation of 0.01 cm. A person tests each delivery by taking 5 samples, accepting the goods only if the mean is at most 8.01 a) Find the probability of type 1 error? b) A hypothesis test...
March 14, 2010

science
what does monitoring information indicate about trends in amount of atmospheric carbon dioxide?
February 28, 2010

science
what does monitoring information indicate about trends in amount of atmosphere carbon dioxide?
February 26, 2010

math
thnk so mch
January 26, 2010

math
The sum of 2 numbers is 26. Four times the first number plus twice the second is 70. What are the numbers?
January 26, 2010

math
an aircraft flew at 400km/h to its destination and returned at 500km/h. If the total trip took 9h, how far did it fly? The answer is 2000km but how
January 26, 2010

algebra
3square root of 9 - square root of 4
January 26, 2010

algebra
3ã9-4
January 26, 2010

math
One number is 5 more than another number. Four times the larger number plus 3 times the smaller is 97. find the numbers. Show your work.
January 20, 2010

math
the sum of two numbers is 51. Twice the first plus 4 times the second is 128. What are the numbers? Show your work.
January 19, 2010

math
2/6
January 19, 2010

1st grade
36
January 19, 2010

economics
The Midnight Hours, a local nightclub earned 100,000 in accounting profits last year, this year the owner, who had invested 1,000,000 in the club, decide to close the club. What can you say about the economic profit (and the rate of return) in the night-club business?
December 7, 2009

economics
Investors have set the following expectations for profitability and earnings: ROI first year must be at least 17% Turnover in the first year is budgeted at DKK 3,400,000, oo excl. VAT and the total investment Amounts to DKK 4.000.000, oo excl. VAT. 1.1 How much profit should ...
December 6, 2009

algebra
how many times greater is 2.6 x 10^7 than 1.3 x 10^5
October 15, 2009

algebra
solve for b when a=55 a=radical sign on 25b
October 11, 2009

algebra
(-s^2t)^5(t^3)
October 11, 2009

algebra
how to simplify this question (-m^2n^3)^3
October 11, 2009

math
i think its 37.50
October 11, 2009

Algebra
I am not given an x value, it is an equation, that has to be simplified and this is the result.
June 15, 2009

Algebra
What is the absolute value of (-x - 6)?
June 15, 2009

Algebra
g(- 1) = 10 - (-1)/2 + - 1 = 19/2 nineteen over two b. all reals c. 21 + t I think this is correct, I am rusty.
June 15, 2009

algebra
The x CANNOT be zero because the denominator cannot be zero or it will be undefined. You solve for the denomn by 19x = 0 and you get x = 0 so
June 14, 2009

trig
Since the angle in in QIII, use the cos=- 1/2 and sin= -sqrt3/2 and the inverse tan function on your calculator since tan is the y/x and is equal to -sqrt3. angle is 60
June 10, 2009

chemistry
The freezing point of a solution is A. higher than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstruction by solute particles. B. lower than the freezing point of the solvent alone ...
April 2, 2008

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