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Questions (40)
If a car with a velocity of 2.0m/s at t=0 accelerates at a rate of 4.0m/s2 for 2.5 sec, what is its velocity
at a t=2.5s?
1 answer
211 views
what is a computer?
1 answer
319 views
describe tourism
1 answer
398 views
Write a pseudocode to input 10 temperatures per day for 20 days and output the average per day and the average for the 20 days.
0 answers
463 views
Write a pseudocode to input 10 temperatures per day for 20 days and output the average per day and average for the 20 days.
0 answers
474 views
4 points A,B,C and D are situated in a 3-dimensional space. In a certain spot, the coordinates of A, C and D are known:
A(1,1,1)
0 answers
516 views
4 points A,B,C and D are situated in a 3-dimensional space. In a certain spot, the coordinates of A, C and D are known:
A(1,1,1)
0 answers
1,093 views
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in
0 answers
941 views
I have this number where they give me the coordinates of 3 particles and the mass of each one of them. Afterwards, there's a
2 answers
488 views
I have this number where they give me the coordinates of 3 particles and the mass of each one of them. Afterwards, there's a
0 answers
461 views
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in
0 answers
614 views
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in
0 answers
1,031 views
I can't figure this problem out:
A bar that's initially held horizontally, weights 500g and is 2m. long. It's maintained by a
1 answer
419 views
If I have a unit vector of (2.06 j)m/s(I have no i vector because it's 0 on a horizontal impulsion, in accordance with my
2 answers
375 views
A ball of 250g hits the floor at a velocity of 2,50 m/s at an angle of 70* relative to the vertical. The vertical force in
4 answers
552 views
A ball of 250g hits the floor at a velocity of 2,50 m/s at an angle of 70* relative to the vertical. The vertical force in
1 answer
700 views
When I'm asked to find work done by air resistance against a skier on a slope, will I have to do:
Wr = -Fr*d or is it affected by
0 answers
448 views
A skier (75 kg) goes down a 15* slope. The coefficient of kinetic friction between the skis and the snow is 0.185. The length of
5 answers
602 views
This is a theory question. Let's say I go down a slope on my skis. When I want to calculate the Work done by air resistance, do
1 answer
381 views
A ball of 250g hits the floor at a velocity of 2,50 m/s at an angle of 70* relative to the vertical. The vertical force in
0 answers
505 views
A truck of 5000kg hits a car of 1500kg at an intersection. After the collision, both vehicles remained glued together and slid
2 answers
630 views
A truck of 5000kg hits a car of 1500kg at an intersection. After the collision, both vehicles remained glued together and slid
1 answer
433 views
Hello, just wanted to verify is what I did is good. I posted this question yesterday and Bob helped me, so just wanted to be
8 answers
650 views
A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a spring
5 answers
399 views
A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a spring
0 answers
473 views
There are many pairs of numbers (positive and negative) of which the sum is worth the unit. Of those, find the 2 numbers whose
2 answers
786 views
There are many pairs of numbers (positive and negative) of which the sum is worth the unit. Of those, find the 2 numbers whose
0 answers
581 views
There are many pairs of numbers (positive and negative) of which the sum is worth the unit. Of those, find the 2 numbers whose
0 answers
917 views
The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m),
0 answers
489 views
1. Carlos jogs in a straight line at a constant speed of 1.5 m/s. He passes by Victoria, who, 10 seconds after Carlos had passed
1 answer
614 views
1. Carlos jogs in a straight line at a constant speed of 1.5 m/s. He passes by Victoria, who, 10 seconds after Carlos had passed
1 answer
543 views
The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m),
2 answers
530 views
Evaluate: (without using Hopital's rule)
d) lim (6-3x)/(((5x+6)^1/2)-4) x->2
1 answer
512 views
Evaluate: (without using Hopital's rule)
d) lim (6-3x)/(((5x+6)^1/2)-4) x->2 ^ | square root
2 answers
537 views
a car brakes to a halt in 5 seconds. The position of the car versus time is given by:
x = 10t - t^2 a) What is the average speed
0 answers
407 views
Evaluate the following limit:
e) lim f(x)-f(a) / x - a x->a if f(x) = x^2 + 5
4 answers
590 views
if lim f(x) = a^3
x->a and if lim g(x) = a^2 x->a calculate the following limit: lim f(x)*(x-a)/(x^3-a^3)*g(x) = x->a
0 answers
504 views
Evaluate the following limit:
e) lim f(x)-f(a)/ x - a x-> a if f(x) = x^2 + 5
0 answers
393 views
Calculate the solubility of silver chloride in 10.0 M ammonia given the following information:
Ksp (AgCl) = 1.6 x 10^–10 Ag+ +
2 answers
1,420 views
Calculate the solubility of AgCl in:
Ksp = 1.6x10^-10 a) 100 ml of 4.00 x 10^-3 M Calcium chloride b) 100 ml of 4.00 x 10^-3 M
3 answers
4,369 views
Answers (36)
Kindly upload solution
thanks bob!
same goes for salts
tnx for the correction Steve, my bad Sarah
What you do with ln(xy) is just separate it into 2 pieces: ln(x) + ln(y) ln(x) + ln(y) = 1 + y' 1/x + y'/y = 1 + y' 1/x - 1 = y' (1 - y)
you have: m1 = 60 kg v1 = 5 m/s m2 = 40 kg v2 = 0 m/s (I presume she's not moving because there's no mention of her velocity) so m1v1 = (m1 + m2)V V = m1v1 / (m1 + m2) solve for v once you find v, you plug it into your kinetic energy formula: K = 1/2mv^2
Rise is the change in the y coordinate, if you think of the graph, you are going up or down. Run is the change in the x coordinate, left to right. To find the change, we take the second coordinate, and subtract the first coordinate. So, what does that give
Electrical conductivity is a physical property. A chemical property involves a change that occurs. However, when electricity passes through an object or substance, no change occurs.
the science that deals with the collection, classification, analysis, and interpretation of numerical facts or data, and that, by use of mathematical theories of probability, imposes order and regularity on aggregates of more or less disparate elements.
il/elle acheter will be il/elle VA acheter je acheterai will be written j'acheterai
Kinetic energy is defined with K = 1/2*m*v^2 so you have Kf - Ki [1/2(m)(vf)^2] - [1/2(m)(vi)^2] = m = mass v = velocity; f for final, i for initial your answer will be in kg * m/s^2 which is the developed way of writing Newtons because 1 kg * m/s^2 = 1 N
thank you
but the angle will still have no effect right?
thank you very much!
I know that I have to use 1/2 mv^2 for the velocity and mgh for gravitational energy, but I'm lost from here, especially when they ask to put it in unit vectors. Thank you
oh and I see what you mean, it's 95 116 J, thanks again!
and drag and friction work has to be higher at the end than gravity in order to stop the skier at the bottom, right?
what is the mistake? And thank you for the information!
same thing with kinetic friction. I have a question where they ask me to find the work done by friction between the skis and the snow. my answer is: Wf = -Fc * d, but I have a feeling that I need to add the angle to it, or is that only with gravity?
how do you find this? 1500*0+5000V=6500V' Thank you for your time
okay cool, thanks a lot Bob
nevermind my first question, my mistake hehe
and why isn't it Wg = Wspring - Wfriction as friction is going to other way?
ohhh I see now, but when you say Work done on spring, you take the Energy formula which is 1/2 k x^2 , wouldn't the work on a spring be mu*N*x?
where Kf is = 0
made a mistake when I wrote Ef = Kf + Ugf instead it's --> Ef = Kf + Ugf + Usf
Okay so from what I understand, I find the elongation from the total Work done on the spring and of course by isolating it in my equation. Sorry if my terms aren't good, I do it in french and try to translate it as good as possible
and what does mu stand for in x*mg*cosTheta*mu ? Thank you for your time!
is it always sinTheta for a force down a plane? Or does it depend on the inclination (left, right)
I don't understand the question either, that's why I posted it here and that's exactly how the problem is written word by word, so I have really no idea :(. From what I can interpret, is that we're looking for what sum of two numbers m + n would give a
tnx Steve! Cheers
the question didn't submit well, here's the problem: lim (6-3x)/(((5x+6)^1/2)-4) x->2
and it's the factorization that I can't seem to come up with, thanks for your quick answer too
yes I know, it is supposed to give 0/0 and they ask us to manipulate the limit algebraically in order to be able to factorize
speed = km/h Car speed = 3 km/3hours = 1 km/1hour = 1 km/h
Can someone please post the answer for these questions?
