Tuesday
July 29, 2014

Posts by scott


Total # Posts: 557

physics
A.) the height of the slope is ___ 500m * sin(24º) GPE = m g h b.) .2 m g h = 1/2 m v^2 .4 g h = v^2

Math
the probability of at least one being defective equals 1 minus the probability that all three are good 1 - (5/8)^3 = .756 (approx)

Lea408
can someone please tell me if I am right Like optical scanners, capacitance fingerprint scanners generate an image of the ridges and valleys that make up a fingerprint. But instead of sensing the print using light, the capacitors use electrical current. (Points : 1) True False...

Chemistry
a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution

Data Management
In a multiple choice test that contains ten questions with each question having five possible answers, what is the probability that Colin will pass the test if he merely guesses at each question?

statistics
A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% chance that the test will be negative. We a...

statistics
A laptop computer manufacturer found that by improving their battery design, they could increase the time that the laptop computer could be used on a single charge. To verify this improvement, they compared a sample of 10 laptops installed with the improved batteries to a con...

statistics
Five coins all balanced the same were tossed 150 times. Note that, while the coins are all balanced the same, they may or may not be fair coins. Since five coins were tossed, the possible number of heads for each toss could be zero through five. The following table gives the n...

CRJ
Please advise if I am right or wrong thanks

CRJ
7. D 8. B 9. B 10.A

CRJ
I think I know the answers could you please tell me if I am right 1. c 2. D 3. B 4. D 5. D 6. B 7. 6. 7. 8. 9. 10.

CRJ
1. Which of the following was an impact on policing as a result of WWII? (Points : 1) The Pendelton Act An increase in educational requirements for police A shortage of experienced officers The adoption of residency requirements for police Question 2. 2. The Pendelton Act of 1...

LEA201
Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...

LEA 201
Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...

statistics
Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative hypothesis. C. The p-v...

Chemistry
What mass of NaOH is required to create 500 mL of a .4 M solution of Sodium Hydroxide(aq)?

SCIENCE HELP PLEASE
NO we always see the same side of the moon because its rotational period is the same as its orbital period (about 28 days) if the moon rotated every 24 hrs (like Earth), then you would see different parts of the moon during its orbit

math
Three times as many childeren as adults attended a concert on Saturday. An adult ticket is $7 and a child's ticket is $3. The theater collected $6000. How many people bought tickets?

Math
the .88 is okay, but the exponent is not actually, there is supposed to be one digit to the left of the decimal point 8.8x10^-3 the exponents are subtracted when dividing (1.23/1.4)x10^(-10 - -8) = .88x10^-2 ___ = 8.8x10^-3

Physics
the net acceleration is ___ g sin(16.9º) - (4.1×103 N / 3.5 × 103 kg) divide the speed at the bottom by the acceleration to get the time for the trip the average speed is (0 + 4.2) / 2 speed times time is distance (the length of the driveway)

physics
the spring compresses until the spring force equals the applied force 14 N = x * 5.0×10^2 N/m

physics
w = 1/2 k x^2 where x is the distance stretched

physics
the component of gravitational acceleration parallel to the slope is ___ g sin(30º) the force on the skier is ___ m g sin(30º)

phyics
with the plane starting from rest and a uniform acceleration, the average velocity is 20 m/s so the time of acceleration is 184/20 or 9.2 s the acceleration is (40 m/s) / 9.2 s

physics
the bank angle provides the necessary centripetal force m * v^2 / r = m * g * sin(θ) * cos(θ) convert v to m/s, then solve for r

Math
there are three pairs of matching sides two are L x W ___ 2 * 7 * 3 two are L x H ___ 2 * 7 * 9 two are W x H ___ 2 * 3 * 9 find the areas, add them together multiply by the paper cost

Physics
the momentum of the system stays constant ___ 94 * .49 forward throw (94 - .27)x + (.27 * 15) = 94 * .49 backward throw (94 - .27)x - (.27 * 15) = 94 * .49

college math
.00001 - .0001 10^-5 - 10^-4 -9x10^-5 ___ -.00009

ap chemistry
a Coulomb ≈ 6.24x10^18 electrons find the number of moles in 96.5 kC (by multiplying) this equals the moles of Ag produced mass = moles * molar mass

physics
your calculated v will be in m/s the question asks for rpm 60 s in a min and circumference = 2πr (60 v) / (2 π r)

PHYSICS
f = m a tension = (3.8 * 2.1) + (3.8 * g)

Physics
the work is equal to the change in the (kinetic) energy of the truck w = (1/2 m 25^2) - (1/2 m 13^2) w = 1/2 * 8000 * (25^2 - 13^2)

math
(15 + 14 + 13 + 12 + 11 + ...) minus (12 + 11 + 10 + ...)

physics
no

Physics
t is the time for Tina to catch David 1/2 a t^2 = v t 1.45 t^2 = 24 t 1.45 t^2 - 24 t = 0 t = 24/1.45 distance = 24 * 24/1.45 speed = accel * t = 2.9 * 24/1.45

physics
the velocity changes by 9 m/s (27 - 18) this takes approx. 2.6 s (9 / 3.5) the average velocity is 22.5 m/s ___ (27 + 18) / 2 the distance traveled is velocity multiplied by time

science
power = work / time p = (1000 * m * g * h) / (30.0 min * 60 s/min) p = (1000 * 196)j / 1800 s (watts)

science
p.e. = m * g * h 10.3 kj = 5.20 kg * 9.8 m/s^2 * h 10.3 k / (5.2 * 9.8) = h (in meters)

Phyics
the rocket attains a velocity of 75.5 * 1.58 or 119.3 m/s since it started from zero, the average velocity for the 1st part of the flight is 119.3/2 or 59.65 m/s it runs out of fuel at a height of 1.58 * 59.65 or 94.24 m in the 2nd part of the flight, the rocket is decelerated...

physics
the velocity in the x-direction is constant the penguin is accelerated in the y-direction by the wind a = f / m = .45 / 5.7 v = a * t the x-velocity and y-velocity add as vectors to give the net velocity (vx)^2 + (vy)^2 = v^2

physics
push off from your backpack as hard and fast as you can, towards the shore you and your backpack will gain equal amounts of momentum you will slide to solid ground and your backpack will end up on the opposite shore

Physics
the net work done on the car, by the driver, is ZERO the force is applied internally to the moving reference frame of the car this would be like sitting in a wagon and trying to move it by pushing on the inside -- no net work

Physics
the work stretching the spring equals the change in the gravitational potential energy 1/2 * k * x^2 = m * g * x 37 x^2 = 3.3 * 980 * x = 3234 x x^2 - (3234/37)x = 0 x = 3234/37

physics
gravity provides a downward acceleration of 9.8 m/s^2 so the bungee cord is providing an upward acceleration of 1.4 m/s^2 (9.8 - 8.4) the force is upward with a magnitude of 65 kg * 1.4 m/s^2

Phyics
velocity = acceleration * time her acceleration is zero for the rest of the race, so her velocity stays constant

Biology
Describe how enzymes affect chemical reactions and explain why this makes enzymes important to living things. I need help this will be on my test I am studying for.

math
how many ways can a 3 person subcommittee be selected from a committee of 7 people

math
using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.

Math
Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment?

Math (probability)
Real Estate ads suggest that 50% of homes for sale have garages, 24% have swimming pools, and 11% have both. If a home for sale has a garage, what's the probability that it has a pool too? Write as a decimal.

Math
What is the cubic feet of a concrete slab 20ft x 30ft x 6" thick.

Math(reiny)
On the earlier questin would the speed be faster not slower?

Math
Over a fixed distance speed r varies inversely as time t. If the speed of a car is 30 mph when the time is 6 seconds what would the speed be of the car if the time was 4 seconds

physics
m * g * h 80.4 * g * 2630 * sin(19.4º)

science
a substance going into solution has no effect on the weight the weight of the solution is the weight of the solvent plus the weight of the solute

chemistry
.1M * (45.5 / 50)

physics
the two particles experience the same force (the tension in the string) since A has twice the mass of B, its acceleration will be half of B's so A's final velocity will be half of B's (1/2 * 2kg * v^2) + (1/2 * 1kg * (2v)^2) = 12J 2 v^2 + 4 v^2 = 24 v^2 = 4 ___ v =...

Algebra 2
the probability of NOT getting a particular glass on any visit is 4/5 or .8 the probability of NOT getting a particular glass on 15 visits is .8^15 the probability of getting a particular glass in 15 visits is 1 - .8^15 the probability of getting all 5 glasses in 15 visits is ...

physical science
the tension in the string provides the force for the centripetal acceleration of the stone f = m * v^2 / r = 1 * 5^2 / .5 the force is in Newtons

physics
If a metal wire carries a current of 79 . 0 mA, how long does it take for 7.90 × 10 20 electrons to pass a given cross-sectional area anywhere along the wire? The fundamental charge is 1 . 602 × 10 − 19 C. Answer in units of s

Chemistry
n and inQ are doubled EAo and E have no change Q is squared

math
How much paper is used for a label on a can of frosting. The height of the jar is 5 inches and the radius is 1.5 inches I did SA=2TTrh+2TTr^2 SA=2TT1.5(5)+2TT1.5^2 SA=15TT + 2TT2.25 SA=15TT=4.5TT SA=19.5TT SA=61.261 SA=61.3in^2 61.3in squared of paper was used for the label Di...

physics
Consider a pendulum of length 4.720 m. The acceleration of gravity is 9 . 832 m / s 2 . a) What is its period at the North Pole? Answer in units of s 009 (part 2 of 6) 10.0 points b) What is its frequency? Answer in units of Hz

Math
Aubrey spent 2/7 of her money and gave 1/4 of the remaining money to her hungry parents. she had $120 left. How much did she have left?

Algebra
I need to factor out the greatest common monomial factor: 1) 20x^2y^2 - 4xy 2) 18s^2t^5 - 2s^3t 3) -2g^4 +14g^2 + 6g

Algebra
I need to solve these equations : 1) 5w^2 - 5w = 0 2) 2x^2 + 15x = 0 3) -32y^2 - 24y = 0 4) 6h^2 = 3h 5) -42z = 14z 6) -12p^2 = -30p

Algebra
How do I factor out the greatest common monomial factor? 1) 9m^7 - 3m^2 2) 12a^5 + 8a 3) I need to describe and correct the error in facotring out the greatest common monomial factor of 18x^8 - 9x^4 - 6x^3 18x^8 - 9x^4 - 6x^3 = 3x(6x^7 - 3x^3 - 2x^2) is INCORRECT

geometry
4. In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. The length of the building is 40 feet long, the width is 20 feet long, and it is 8 feet from the ground t...

physics
A steam engine’s boiler completely converts 151 kg of water to steam. This process in- volves the transfer of 4.8786 J J as heat. If steam escaping through a safety valve does 1.66 × 108 J of work expanding against the outside atmosphere, what is the net change in t...

physics
A person takes in a breath of 27C air and holds it until it warms to 36.5C. The air has an initial volume of 0.39 L and a mass of 0.00077 kg. Determine the work done by the air on the lungs if the pressure remains constant at 1 atm. Answer in units of J

Math/Physics
What is an expression for the standing wave that is produced by adding the two waves (2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] and (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t]

Physics
Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.

Physics
If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?

Physics
Write an expression for the standing wave produced by adding the two waves (2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] and (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t].

Physics
Two identical tuning forks have frequencies of 512 Hz. If one is held by a listener while the other approaches at a speed of 7.2 m/s, what does the listener hear?

Physics
the horizontal velocity of the ball is ___ Vh = 176 cos(35º) the vertical velocity of the ball is ___ Vv = 176 sin(35º) it takes the ball 565 / Vh seconds to reach the back wall the time to the peak of the ball's trajectory is ___ Vv / g the difference between th...

Math
x / (2x + 10) = 5 / 12 "cross" multiplying ___ 12x = 10x + 50

Physics
vacuum doesn't pull, pressure pushes b.

Physics
500 N/m^2 b.

Physics
2 s up and 2 s down the velocity took 2 s to drop to zero (at the peak of the flight) so it must have started at 20 m/s

Chemistry
calculate the pH of a 0.2moldm-3 solution of ammonia at 298K given that Kb for ammonia is 1.8x10-5

Math
It is not a school question. It is a real life question. So let's assume the interest averaged 4 % compounded daily over the 27 years.

Math
$2700 left in an account paying 4% interest would be worth how much today?

Economics
$2700 left in a variable rate interest bearing account in 1986 is worth how much today ?

Math
If I left $2700 in a variable rate interest account in 1986, how much is it worth today ?

physics
A block starts at rest and slides down a fric- tionless track. The acceleration of gravity is 9.81 m/s2 . It leaves the track horizontally, striking the ground (as shown in the figure above). b b b b b b b b b b b b 502 g h 2.2 m 4.4 m 9.81 m/s2 a) At what height h above the g...

Physics
Two banked curves on a highway have the same radius. Curve A is banked at 13 degrees and highway B is banked at 19 degrees. A car can travel around curve A without relying on friction at a speed of 18 m/s. At what speed can this car travel around curve B without relying on fri...

physics
A flight attendant pulls her 74.2 N flight bag a distance of 324 m along a level airport floor at a constant velocity. The force she exerts is 37.9 N at an angle of 55.2 above the horizon- tal. a) Find the work she does on the flight bag. Answer in units of J 024 (part 2 ...

physics
A 42.1 kg diver steps off a diving board and drops straight down into the water. The water provides an average net force of resistance of 1559 N to the diver’s fall. If the diver comes to rest 4.1 m below the water’s surface, what is the total distance be- tween the ...

physics
Calculate the speed of an 7.6×104 kg airliner with a kinetic energy of 1.2 × 109 J. Answer in units of m/s

Physics
During a baseball game, a batter hits a pop up to a fielder 65m away. The acceleration of gravity is 9.8m/s^2. If the ball remains in the air for 5.7s, how high does it rise? Answer in units of m.

physics
65 = .5 g t^2 130 = 9.8 t^2 the distance is 7.8*t

physics
.4 = .5 g t^2 .8 = 9.8 t^2 the x-velocity is 76/t

physics
A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 173 N at an angle of 27.5 above the horizontal. The box has a mass of 27 kg, and μk between the box and the floor is 0.2. The acceleration of grav...

physics
Consider the 57 N weight held by two cables shown below. The left-hand cable is horizon- tal. 57 N 52 a) What is the tension in the cable slanted at an angle of 52? Answer in units of N

physics
A 2.67 kg block starts from rest at the top of a 27.6 incline and accelerates uniformly down the incline, moving 2.89 m in 2.45 s. The acceleration of gravity is 9.81 m/s2 . a) What is the magnitude of the accelera- tion of the block? Answer in units of m/s2

physics
A 31 kg box slides down a 33.0 ramp with an acceleration of 1.30 m/s2. The acceleration of gravity is 9.81 m/s2 . Find the coefficient of kinetic friction between the box and the ramp.

math(please help)
Al + As + B = 124 Al + B = 102 subtracting equations ___ As = 22 Al + As = 86 subtracting equations ___ Al = 64 subtracting equations ___ B = 38

Physics
the vertical component of the brick's velocity is 13.9 * sin(27.6º) 0 = (-.5 g 3^2) + [13.9 * sin(27.6) * 3] + (building height)

Math
d/dx [cos(x)]^2 = 2 cos(x) * [-sin(x)]

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