Posts by scott
Total # Posts: 4,247

Physics
the formula is for distance traveled over time (t) ... starting from rest ... with uniform acceleration you're using g , so it must be a falling object the answer looks okay ... BUT (there's always one) ... have you learned about significant figures? 
Physics
free fall equation is ... h = 1/2 g t^2 + ho h = 0 (ground level) , ho = drop height plug in values and solve for t ... the positive value 
physics
(m * g * h) / efficiency convert cm to m ... answer is in Joules 
Math
six quarter miles beyond the $1.70 for 1 1/2 to 1 3/4 1.70 + (6 * .45) = 4.40 4.40 * 1.1 = ? 
science
find the circumference ... 2 ? r it goes around 3.5 times in one sec ... in one second, the outer edge travels ... 3.5 circumferences 
Physics
velocity = acceleration * time 
Math
the general slopeintercept form is ... y = m x + b ... the coefficient of the x term is the slope (m) ... the constant term is the yintercept (b) 
Math
the general slopeintercept form is ... y = m x + b ... the coefficient of the x term is the slope ... the constant term is the yintercept 
math
the 10t/3 that bob talks about is in c 
Geometry
draw lines through the points in the x and y directions find the right triangle whose hypotenuse is the distance you want ... the lengths of the sides are the distances between the two points in the x ... and y directions you can also find the x and y distances by subtracting ... 
physics
there is a "range equation" wikipedia is a good source 
Math
(now / then) * 100% 
Math
13 = 5 + 20m  2m 
Physics
h1 = 1/2 g t^2 + 67.0 h2 = 1/2 g t^2 + 20.0 t set the heights equal and solve for t ... substitute back to find the collision height b. v1 = g t ... downward v2 = 20.0  gt ... downward the 2nd ball reaches its max height and begins to fall back down before the 1st ball ... 
Physics
momentum is conserved , vertically and horizontally the larger piece carries all of the vertical momentum , and horizontal momentum equal and opposite to the smaller piece find the vertical and horizontal momentum vectors and add them 
Physics
the force on the system is the weight (m*g) of the hanging mass ... a = f / m the tension in the string is the force necessary to give the block the calculated acceleration ... t = m a 
physics
grams are ... what do they measure? 
physics
yes centi is the prefix for one hundredth 
Science Chemistry
bob ... could you please check your calculations (and units) 
Science Chemistry
1.1E3 mg/mL * 0.18 = ? 
math
74468 = a * [1 + (.03 / 12)]^(12 * 13) log(74468) = log(a) + 156 log(1.0025) 
Algebraic Expressions
the title of the question is "algebraic expressions" (54  a) / 6 
Math
there are 36 inches in a yard there are 12 inches in a foot convert the measurements to inches and subtract 
math
2 * 8 (15.5 + 12.25) = 444 (450  444) / 444 = .01351 ? 1.4% there appear to be several arithmetic errors in your calculations ... but your method is correct 
algebra
yes 
algebra
it looks like ... g(x) = f(x) + 1 adding 1 to a function results in what kind of translation? 
Math
yes 
Math
7 / 28 = ? / 4 = ? / 100 = ? % 
Math
yes 
Math
ABO is an isosceles triangle ... AO and BO are radii of the circle ... so angles A and B are equal ... A = B central angle O equals the arc AB ... O = 100º A + B + O = 180º 
Math
25 / 15 = 30 / 18 = ? / ? 
math
tire circumference * rpm * minutes per hour / meters per km 2 * ? * 0.30 * 779 * 60 / 1000 
physics
power = m * g * h / t = 63 * 9.8 * 5.2 / 3.5 (watts) 
math
how many texts do you send in a month? 
Math
yes 
Math
how many edges does a cube have? 
Math
good 
Maximum area.
one long side is already there 5x + y = 120 ... y = 120  5x area = x (120  5x^2) = 120x  5x^2 the max is on the axis of symmetry ... x = 120 / (2 * 5) = 12 y = 60 ... area = 720 
Dimensions of wall
let w = width , length = w + 4 ... cross section area = w (w + 4) width with border = w + (2 * 2) = w + 4 length with border = w + 4 + (2 * 2) = w + 8 area with border = (w + 4) (w + 8) area of border = [(w + 4) (w + 8)]  [w (w + 4)] = 240 solve for w , then substitute back ... 
Math
missing some units and exponents? 
MATH
the common difference is 11 , so there appear to be 10 terms "missing" between 20 and 141 
Math
yes 
Math
yes 
Math
yes 
PHYSICS
you can have 0.1 s OR 2 m...not both (unless it is two different scenarios) stopping in 0.1 s means traveling 0.2 m ... as bob said , 80 N stopping in 2 m takes 1.0 s ... 8 n 
Physics
is the 200 m distance across the round about part of the 2 km? 
physics
the freefall equation is ... h = 1/2 g t^2  15 t + 55 ... g = 9.8 solve for t ... the positive solution 
math
the freefall equation is ... h = 1/2 g t^2  15 t + 55 ... g = 9.8 solve for t ... the positive solution 
MATH
using a zscore table 16% above the mean of a population is approximately .7 s.d. 
math
sin^2 + cos^2 = 1 ... cos = ?(1  sin^2) = ?[1  (2/5)^2] find the cosine ... remember, it's positive in Quad IV sec = 1 / cos ... tan = sin / cos 
Maths
4 (the short side) is multiplied by 7/4 (the enlarging factor) n times to equal 20 (the short side of the large sheet) 4 * 7/4 * 7/4 ... = 20 n is probably not an integer , so just round it down to the next whole number ... no fractional enlargements you can start with 4 and ... 
Maths
4 * [(7/4)^n] = 20 
Math
circumference = 2 * ? * radius if the radius is increased by 6 ft , how much does the circumference increase? 
Math  integers
? is 3.14159... [?] = 3 [?] = 4 
Science
if you labeled this a math question, it might have been answered sooner 
Science
18 to 26 is 4 terms with a difference of 8 ... so the common difference is ... 8 / 4 = ? the 20th term is 8 terms beyond 26 (the 12th term) ... 26 + 8 differences = ? 
maths
there are 36 ways for two dice to end up 6 of those ways have both dice showing the same number of points 
Science
is there a question for any of the three entries? 
geometry
the dilated points will be 3 times the distance from F as the original points ... the direction is along the line from F to the point being dilated A' is 3 times farther from F than A , along the FA line D is 1/3 the distance from F to D' , along the FD' line F to ... 
Sat Math
this is kind of a solve by inspection (and thought) problem the "magic" value is 10 ... 2x + 6 must be GREATER than 10 (not equal to) how small can x (a positive integer) be , if 2x must be greater than 4? 
Sat Math
y = m^4 ... m = y^(1/4) y = n^3 ... n = y^(1/3) m n = y^[(1/4) + (1/3)] 
6th grade math
5 t + 7 c = 1210 t = 3 c substituting ... 5 (3 c) + 7 c = 1210 ... 22 c = 1210 solve for c , then substitute back to find t ann needs ... 8 t + 4 c 
math
an assumption is made that they each drive at some constant speed Mickey ... 40 mi in 4/5 hr ... 40 / (4/5) = 50 mph Dylan reached the city when Mickey had driven 200 mi ... in 4 hr at 50 mph Dylan drove 240 mi in 4 hr ... speed = distance / time 
geometry
1) there are mixed units ... inches and feet ... convert to one or the other and recalculate 2) yes 3) yes ... like a fraction , the answer can be reduced 4) close ... try again ... 4 / 13 = 2 / 6 ?? 
math
8 b + 7 c + 10 m = 667000 b + c + m = 76000 b + c = m = 38000 8 b + 7 c = 667000  10 m = 667000  380000 = 287000 7 b + 7 c = 7 * 38000 = 266000 subtracting equations ... b = 287000  266000 
math
p  w = 240 / 1.5 p + w = 240 / 1 adding equations ... 2 p = 400 solve for p , then substitute back to find w 
Algebra
a = 10000 [1 + (.085 / 4)]^(3 * 4) 
math
3 card combinations ... 52C3 black 3 card combinations ... 26C3 red 3 card combinations ... 26C3 probability not same color = 1  (probability of same color) = 1  [(2 * 26C3) / 52C3] 
stats
the height range is from 7/18 s.d. below the mean to 3/18 above the mean a zscore table will show the portion of the population that lies in this range ... the portion is equivalent to the probability 
math
how big is the shed? 
Math for 6th Grade
w * 120% = 90 ... w * 1.2 = 90 ... w = 90 / 1.2 
MATH
blatant cheating ... sounds serious ... just curious ... what course is this? ... what text? ... are the answers correct? is someone having a laugh at others' expense? 
MATH
sure ... why not? 
Mathematics
disregard my 1st response 
Mathematics
11 differences ... 75  31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... add them ... multiply by half the number of rows 
Mathematics
11 differences ... 75  31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... average them ... multiply by half the number of rows 
Algebra
distribute over the value in parentheses then add like quantities 
math
b + p + m = 734.4 m = b / 4 ... b = 4 m p = m / 3 ... m = 3 p ... b = 12 p substitute to find the solution 
Math
half tank plus quarter tank equals threequarters tank 3/4 t = 24 ... t = ? 
Math
total momentum is constant in the system the sum of the initial momenta equals the sum of the final momenta find the total and subtract the larger mass after the collision 
math
then your answer is correct 
math
no ... none of the choices are correct check the transcription of the problem 
Math
are you aware of PEMDAS? ... order of operations none of the offered solutions are correct ... maybe missing parentheses? 
science
there is acceleration in the vertical direction due to the force of gravity ... so vertical velocity changes there is no horizontal acceleration ... so horizontal velocity remains constant 
Math
yes 
Math
left and right? i vote for B 
Math
he passes when they are at the same distance ... 10 is correct 
Algebra II
5850 = 4300 e^(8r) ... ln(5850/4300) = 8 r 5850 = d e^(17r) 
Algebra
10^1.0414 = 11 
Algebra
343 = 7^3 loga(343) = 3 loga(7) 
Algebra
a = 480 [1 + (.09 / 4)]^(4 * 8) 
math
158/3 * 4/3 = 632/9 = what mixed number? 
6th grade math
there are 5 choices for the 1st (leftmost) digit ... a "leading" zero is not standard form 5 choices for the 2nd digit ... zero is available 4 choices for the 3rd digit 5 * 5 * 4 = ? 
Math
let x equal amount of milk chocolate (25 * 5.5) + (x * 2.9) + [(25  x) * 4.4] = 50 * 4.5 
Math
[(x2) / x] + 3/2 = x / (x2) 2(x2)^2 + 3x^2  6x = 2x^2 2x^2  8x + 8 + 3x^2  6x = 2x^2 ... 3x^2  14x + 8 = 0 there is one positive solution ... 2/4 + 3/2 = 4/2 
Science
angular velocity is in ... radians per second ... rad/s there are 2? radians in one revolution for angular velocity, the length of the radius is immaterial 
Math
yes 
binomial probability
probability of prime (1, 2, 3, 5) ... 4/6 = 2/3 ... not prime, composite (4, 6) ... 2/6 = 1/3 (p + n)^6 = p^6 + 6 p^5 n + 15 p^4 n^2 + 20 p^3 n^3 + ... probability 3 prime and 3 not ... 20 * (2/3 * 1/3)^3 
Logarithms
squaring a value doubles the log 
Algebra 2
r = (300  15 n) (5 + .50 n) = 1500 + 75 n  7.5 n^2 the max is on the axis of symmetry ... n = b / (2 a)