Sunday
August 28, 2016

Posts by Scott

Total # Posts: 1,225

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
September 26, 2013

science
power = work / time p = (1000 * m * g * h) / (30.0 min * 60 s/min) p = (1000 * 196)j / 1800 s (watts)
September 25, 2013

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)
September 25, 2013

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...
September 25, 2013

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
September 25, 2013

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
September 25, 2013

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
September 25, 2013

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
September 24, 2013

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
September 24, 2013

Phyics
velocity = acceleration * time her acceleration is zero for the rest of the race, so her velocity stays constant
September 24, 2013

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.
August 28, 2013

math
how many ways can a 3 person subcommittee be selected from a committee of 7 people
July 31, 2013

math
using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.
July 31, 2013

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?
July 31, 2013

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.
July 27, 2013

Math
What is the cubic feet of a concrete slab 20ft x 30ft x 6" thick.
July 18, 2013

Math(reiny)
On the earlier questin would the speed be faster not slower?
July 11, 2013

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
July 11, 2013

physics
m * g * h 80.4 * g * 2630 * sin(19.4º)
July 8, 2013

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
July 8, 2013

chemistry
.1M * (45.5 / 50)
July 7, 2013

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...
July 7, 2013

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...
July 6, 2013

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
July 6, 2013

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
May 21, 2013

Chemistry
n and inQ are doubled EAo and E have no change Q is squared
May 8, 2013

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 ...
March 18, 2013

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
March 17, 2013

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?
March 14, 2013

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
March 12, 2013

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
March 12, 2013

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
March 12, 2013

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 ...
March 1, 2013

Analytical Chemistry
if you use the pk2 wouldnt you get a negative value for nah2po4?
February 22, 2013

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 ...
February 19, 2013

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
February 19, 2013

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]
January 30, 2013

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.
January 30, 2013

Physics
If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?
January 30, 2013

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].
January 30, 2013

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?
January 30, 2013

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 ...
January 18, 2013

Math
x / (2x + 10) = 5 / 12 "cross" multiplying ___ 12x = 10x + 50
January 18, 2013

Physics
vacuum doesn't pull, pressure pushes b.
January 18, 2013

Physics
500 N/m^2 b.
January 18, 2013

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
January 14, 2013

Chemistry
calculate the pH of a 0.2moldm-3 solution of ammonia at 298K given that Kb for ammonia is 1.8x10-5
January 6, 2013

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.
December 19, 2012

Math
$2700 left in an account paying 4% interest would be worth how much today?
December 19, 2012

Economics
$2700 left in a variable rate interest bearing account in 1986 is worth how much today ?
December 19, 2012

Math
If I left $2700 in a variable rate interest account in 1986, how much is it worth today ?
December 19, 2012

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 ...
December 3, 2012

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 ...
November 27, 2012

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 ...
November 22, 2012

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 ...
November 22, 2012

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
November 22, 2012

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.
November 19, 2012

physics
Give up. Drop out of school
November 16, 2012

physics
65 = .5 g t^2 130 = 9.8 t^2 the distance is 7.8*t
November 11, 2012

physics
.4 = .5 g t^2 .8 = 9.8 t^2 the x-velocity is 76/t
November 11, 2012

physics
I got -29.43m\s but that's not taking air resistance Into consideration.
November 7, 2012

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 ...
November 6, 2012

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
November 6, 2012

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
November 5, 2012

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.
November 5, 2012

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
November 4, 2012

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)
November 4, 2012

Math
d/dx [cos(x)]^2 = 2 cos(x) * [-sin(x)]
November 4, 2012

Pre- AP Physics
the gravitational force between two objects is the same for both objects
November 4, 2012

Math
a. w = f * d = 150 * 4 = 600 Nm b. 600 / .5 = 1200 Nm
November 3, 2012

physics
A 1.6 kg otter starts from rest at the top of a muddy incline 95.9 cm long and slides down to the bottom in 0.50 s. What net external force acts on the otter along the incline? Answer in units of N
November 3, 2012

physics
A shopper in a supermarket pushes a loaded 32 kg cart with a horizontal force of 10 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 3.3 s, starting from rest?
November 3, 2012

physics
A freight train has a mass of 3.1 × 107 kg. If the locomotive can exert a constant pull of 4.9 × 105 N, how long would it take to increase the speed of the train from rest to 71.9 km/h? Disregard friction.
November 3, 2012

physics
f = m * a ___ a = f / m a = .052 N / 474 kg v = a * t ___ t = v / a t = 880 m/s / (.052 N / 474 kg) t will be in sec__convert to days
October 30, 2012

physics
Salmon often jump waterfalls to reach their breeding grounds. Starting 1.77 m from a waterfall 0.253 m in height, at what minimum speed must a salmon jumping at an angle of 44.8 leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s2 . Answer in...
October 16, 2012

physics
A basketball player 1.9 m tall wants to make a basket from a distance of 7.8 m. The hoop is at a height of 3.05 m.If he shoots the ball (from a height of 1.9 m) at a 23.5 angle, at what initial speed must he shoot the basketball so that it goes through the hoop without ...
October 16, 2012

math
if an airplane is traveling at 245 meters per second, how many kilometers per second does it travel?
October 10, 2012

Geometry
interior + exterior = 180º
October 3, 2012

7th grade Science help
1. a 2. b 3. d
September 26, 2012

math
divide 1st (multiply by inverse) (1/3 * 7/5) + (5/14 * 7/5) 7/15 + 1/2 = 14/30 + 15/30
September 26, 2012

Pre-Calculus
f(x) + g(x) = (x^2) + (3x + 9) = x^2 + 3x + 9 = h(x) you can break it into whatever pieces you like h(x) = (x + 5)(x + 3) = x^2 + 8x + 15 f(x) = x^2 + 9 ; g(x) = 8x + 6 h(x) = f(x) + g(x) a. f(x) = 3x - 1 ; g(x) = 3 - 2x __ (3x - 1) + (3 - 2x) = x + 2 = h(x) b. f(x) = 7x - 3...
September 26, 2012

physics
it takes 5 s to stop the car __ 55 / 11 the average speed (Va) is __ (55 + 0) / 2 the stopping distance is __ Va * 5 twice as fast means that the stopping time is doubled, along with the average speed __ this means that the car travels 4 times as far
September 26, 2012

math
(3 1/2) / (2 1/3) (7/2) / (7/3) = 3/2 = 1 1/2
September 26, 2012

science
1. a 2. d 3. a 4. c 5. b
September 26, 2012

science
LARGER
September 26, 2012

Physical Science
you need 500 N to overcome the static friction as is frequently the case; once something starts, it is easier to keep it moving
September 26, 2012

physics
the frictional force is __ .29 g the time to stop is __ 5.6 / (.29 g) the average velocity is __ (5.6 + 0) / 2 the distance traveled is the average velocity divided by the time
September 26, 2012

Physics
t * 2.3 * 120 = (59/60) * 16 * 240
September 26, 2012

math grade 10
cuberoot(1280) cuberoot(64 * 20) 4 * cuberoot(20)
September 26, 2012

Geometry
if you double the length, you double the area to have an area of 55 and a perimeter of 32, the original garden was 5 X 11 so the increase in perimeter is 22 __ the percentage is __ (22/32) * 100
September 26, 2012

Physics
average speed (Va) is __ (23 + 0) / 2 time (t) is distance/speed __ 210 / Va acceleration is speed change/time __ (0 - 23) / t
September 26, 2012

Stats
74.2 * 85
September 26, 2012

Chemistry
if you over titrate, you should be able to correct with a titration of a standard acid if you think you may have added too much, the amount of the unknown acid will appear to be more than it actually is __ this would cause you to think you have more moles, so the equivalent ...
September 26, 2012

chemistry
1000 nm in a µm
September 26, 2012

chemistry
50C is halfway between the freezing and boiling points of water (0C and 100C) 50F is is slightly above the freezing point (32F) and well below the boiling point (212F)
September 26, 2012

physics
momentum is conserved 41 * 7 = v * (41 + 30)
September 26, 2012

Physics
the throwing angle has no effect the KE at impact is the initial KE plus the KE gained from the gravitational potential (m g h) KE = (.5 * .058 * 11.0^2) + (.058 * 9.8 * 12.3) v^2 = (2 * KE) / .058
September 26, 2012

Chem
the molecular weight of CS2 is 76.13 so the C in 67.1 g is: 67.1 * (12.01 / 76.13) the molecular weight of CCl4 is 153.81 so the C in 45.2 g is: 45.2 * (12.01 / 153.81) divide the CCl4 carbon by the CS2 carbon to find the percent yield
September 26, 2012

Physics
the frictional force (which must be overcome) is __ m * g * 0.200
September 26, 2012

Physic
(m v^2) / r = m g sinΘ v^2 = 6.00 m * g * sin(9.0º)
September 26, 2012

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