Homework, or a homework assignment, is a set of tasks assigned to students by their teachers to be completed outside the classroom. Common homework assignments may include required reading, a writing or typing project, mathematical exercises to be completed, information to be reviewed before a test, or other skills to be practiced.
The effects of homework are debated. Generally speaking, homework does not improve academic performance among young children, because children need more sleep to develop and grow. Homework may improve academic skills among older students, especially lower-achieving students. However, homework also creates stress for students and parents, and reduces the amount of time that students can spend in other activities.
Homework Statement
The problem seems like this: on the left, closer to the floor, is block3 with mass 1.0kg, there is a string above it which connects it to block2 with mass 3.0kg which has a string above it that circles around a pulley and comes back down connecting it to block1 with mass...
Homework Statement
A 10kg mass is released from rest and slides down an incline that makes an angle of 37degrees with the horizontal. The coefficient of friction is 0.4 on the incline. Determine (a) the force of friction acting to oppose the motion, and (b) the acceleration
Homework...
[SOLVED] help with homework problem
Homework Statement
A uniform disk of radius 4.4 m and mass 9 kg is suspended from a pivot 1.364 m above its center of mass. The acceleration of gravity is 9.8 m/s^2. Find the angular frequency w for small oscillations.
The Attempt at a Solution
I'm just...
A 1.0 kg magnetized air puck moving across a level table at 0.24 m/s approaches head-on a stationary, similarly magnetized air puck of mass 0.50 kg. If the "magnetic collision" is repulsive and perfectly elastic, determine:
(a) the velocity of each puck after the collision
(b) the velocity of...
An applied force accelerates mass A at a rate of 6.0m/s^2. The same force applied to mass B accelerates the mass at a rate of 8.0m/s^2. If the same force were used to accelerate both masses together, what would be the resulting acceleration be?
Homework Statement
The problem is:
After being closed for along time, the switch shown in figure 1 opens at t=0. Find IA for all time.
Homework Equations
I believe it would be i(t)=Ioe^(-t/(CReq)) or i(t)=(Q/P)+Ae^(-Pt)
Q/p=Vo/r and 1/p is time constant or t/(CReq)
The Attempt at...
A rectangular solid is to be constructed with a special kind of wire along all
the edges. The length of the base is to be twice the width of the base. The
height of the rectangular solid is such that the total amount of wire used (for
the whole figure) is 40 cm. Find the range of possible...
A projectile is fired from the surface of level ground at an angle Ao above the horizontal.
A) Show that the elevation angle B of the highest point as seem from the launch point is related to Ao by tanB = (1/2)tanAo
B) Calculate B for Ao = 45 deg
So
I figure at the highest point, Vy must...
[SOLVED] Pre Calculus Homework Problem...Help!
[b]1. Homework Statement
A quadrilateral has two pairs of congruent sides and a longer diagonal of length of 6, as shown. For what value of x will the area of the shaded region be 40% of the area of the unshaded region?
[b]2. Homework...
Homework Statement
A turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. The equation for the turtle's position as a function of time is x(t)=50.0cm+(2.00cm/s)\,t-(0.0625cm/s^2)t^2
At what time t is the turtle third time a distance...
I have received a homework document from one of my professors.
However, I am having difficulty answering some of the questions, since the diagram seems so awful to understand.
You can find the document here. http://docs.google.com/Doc?id=dcnj7bph_2fnmnzt
For question # 1 and 2 I put...
Homework Statement
I've got a problem that I can't figure out. It deals with strain.
I've got a box, sitting on the x-y axis(like normal x-y axis's are). The box extends 4 inches from the origin in the x direction, and 2 inches up. Going clockwise(starting at origin) the corners are...
Homework Statement
In Figure 5-65, a force of magnitude 13 N is applied to a FedEx box of mass m2 = 1.2 kg. The force is directed up a plane tilted by ? = 38°. The box is connected by a cord to a UPS box of mass m1 = 5.0 kg on the floor. The floor, plane, and pulley are frictionless, and the...
Homework Statement
Four point charges are situated at the corners of a square with sides of length a.
Find the resultant force on the positive charge q. HINT: write an expression for the resultant force, use Ke for Ke, q for q, and a for a! That makes sense, because not much information is...
Homework Statement
What is the ratio of the volume of the bulb of a thermometer to the volume of the thin tube in a bulb thermometer. It's not really a problem, but its just something I need to know to for my course. I can't find it anywhere else, so I was wondering if anyone knew it here...
Consider two iron spheres, each of diameter 100mm, which are just touching. At what distance r from the center of the Earth will the force of mutual attraction between the contacting spheres be equal to the force exerted by the Earth on one of the spheres?
Here's my work...
d = distance...
Homework Statement
Homework Equations
I know that at low frequency the capacitor will act like an open circuit.
However, i do not know what is meant by input impedance, does this just mean the combined impedance of the components in this circuit?
The Attempt at a Solution
Assuming it is...
Homework Statement
Determine wheatehr the sequence diiverges or converges:Homework Equations
a_{n}=\frac{(n+2)!}{n!}
The Attempt at a Solution
I was going to treat it using limits but the factorial is not defined for a function.
How do I deal with this?
Edit: sorry it is suppose to be...
There doesn't seem to be a homework problem section for linear algebra so either this is the place to post it or they'll move it.
The question is to prove that r0 = 0. I can't even figure out the first step. Can someone tell me the first step in solving this problem? Thanks.
Pete
1. If I measure the acceleration of an object every 1 second, I will have a g-force which I can use formula 1 to convert into meters per second per second. Therefore I know from the result of this formula how much the object has accelerated/de-accelerated in the last second.
If however I wish...
I need help desperatley with this problem.
Sam (65 kg) takes off (from rest) up a 50 m high, 10° frictionless slope on his jet-powered skis. The skis have a thrust of 160 N. He keeps his skis tilted at 10° after becoming airborne. How far does Sam land from the base of the cliff?
I believe...
Homework Statement
A 68 kg in-line skater starts from rest and accelerates at 0.21 m/s square for 15s.
a) Find her final velocty and total kinetic energy after the 15s of travel.
b) If she exerts a breaking frictional force of 280N, find her stopping distance.
Homework Equations...
Homework Statement
We know cyclic integral F(r).dl=0 => curl F(r)=0 and F(r) is a conservative vector field.
What if the vector field is NOT a function of r(x,y,z)?Suppose,F is a function of velocity or time...i.e. F=F(v) or F=F(t).Say we do not know v=v(r) or t=t(r).In that case will the...
Homework Statement
A bullet of mass m moving with velocity V_o crashes into a block of mass M at rest on a frictionless horizontal surface the block is sitting at the edge of a table that is H high. When the bullet hits the block it flies off the table and it lands a distance x from the bottom...
Homework Statement
As measured in Earth's frame of reference, two planets are 491,000 km apart. A spaceship flies from one planet to the other with a constant velocity, and the clocks on the ship show that the trip lasts only 1.10 s. How fast is the ship traveling? (Enter your answer to 4...
Doppler effect homework problem help (still lost)
Homework Statement
A block with a speaker bolted to it is connected to a spring having spring constant k = 17.0 N/m, as in Figure P17.40. The total mass of the block and speaker is 44.00 kg, and the amplitude of this unit's motion is 0.475...
A container of mass 4kg on a shelf is supported by a strut as shown. The container is evenly loaded and it is centrally placed on the shelf. (Ignore the weight of the shelf)
http://img256.imageshack.us/img256/1038/7bq4tx9.gif
a) What are the three forces acting on the shelf?
b) What is...
Really stuck at this question.
In an experiment on sound interference, two sources A and B are placed 2m apart. As a girl walks from X to Y she hears a point of maximum loudness ar point P and the next at point Q. Using information from the diagram below find distances AQ and BQ...
Homework Statement
Positive charges are situated at three corners of a rectangle, as shown in the attachment. Find the electric field at the fourth corner.
the numbers are: bottom left- 3.00 nC bottom right-5.00 nC top right- 6.00 nC
the length of the rectangle is .6 m and the width...
I'm new to op-amps, and would like some guidance. I have a quick question on this HW problem. I'm not asking you to do it for me, but I want to see if my hunch is correct:
http://img66.imageshack.us/img66/8872/screenshot01bb7.jpg
Now, using ideal op-amp model... I'm going to assume:
V+ = V1...
Homework Statement
f(x) is a piecewise function defined as:
2(2e-e^x) x<1
3\pi x-4 x>=1
Discuss the continuity of f(x) at x=1.
Homework Equations
The Attempt at a Solution
Putting x=1 in the above function gives you 2e and 3\pi -4. They seem to be equal, but how do I...
Homework Statement
I wasn't sure if i was doing this problem correctly, if anyone could double check for me, that would be great!
You ride your bicycle down a hill. Your total mass is 40 kg. At the top of the hill, your
speed is 5 m/s. The hill is 20 m high and 200 m long. If the force of...
I need a bit of help here. I have an upcoming assessment towards bridge design. The task is to create and construct a bridge made out of dried spaghetti sticks. The bridge is to be as light as possible while holding the most weight.
I currently have 1 main design I'm leaning towards, but I'm...
Hello.
Homework Statement
There is a link to the problem and its picture here: http://media.wiley.com/product_data/excerpt/19/04717580/0471758019-1.pdf
It is # 46.
Here is the problem as well:
In Fig. 4-44, a ball is thrown up onto a roof, landing 4.00 s later at height h=20.0m...
Homework Statement
(9^(3/x))^4
(without calculator)
Homework Equations
a^n/m = m'root'a^n
The Attempt at a Solution
adding the powers: 3/x*4/1 = 12/x
9^12/x
x'root'9^12 = ?
----------------------
Ok, it's supposed to be 27, but how can you know something that are...
Hello all. I am new to this forum and I'm glad I found this place! Anywho, here's the problem I'm stuck on...
Three equal charges 4.4 micro coulombs are located in the xy-plane, one at (0m, 63m), another at (52m, 0m), and th third at (49m, -53m). Find the magnitude of the electric field at...
RLC Circuit Homework Problem
Thia last HW problem is stumping me.
This is my first year of physics class, and I am working on some homework problems tonight. It's the last m/c question out of 30 that I am doing tonight, and I'm having a bit of trouble figuring this one out:
Question...
Hi, I have been struggling a little with this question.
Scuba divers breathe a mixture of O2(g) and He(g) to avoid "the bends, a condition caused by nitrogen in the blood. If 65.0g O2(g) and 2.00g He(g) are placed in a 5.0L tank at 25oC, calculate:
If the average human takes 15 breaths...
I am trying to do the problem below but I don't understand how to do it. Can you please show me how to do it? DON'T give me the answer, explain to me how to get the answer.
http://img134.imageshack.us/img134/9168/untitled1au7.jpg
Point C moves at a constant rate along semicircle centered...
How do I show that
T_n(x)=\cos(n\arccos(x))
are actually polynomials of degree n?
If n=2 then
T_2(x)=x^2-(1-x^2)
but this seems to break down as n increases.
How far from Jupiter must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Jupiter's pull?
i know that i need to use m1/r2=m2/((2.78e-11)-r)squared
but my answers keep coming out wrong. For an answer, i got 2.4e7 km
I have all of my question pretty much divided out into formulas and just need some help with with what i am putting into it.
The question reads, a 330kg piano slides 3.6m down a 28degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The...
2N2O5 heat-- 4NO2 + O2
1.618 g of O2 are produced, how much NO2 in grams are produced? I got 9.30 g NO2, is that right? I used 1 mol O2 = 32 g O2, and 1 mol NO2 = 46g NO2. I first converted g O2 to Mol O2 then used the balanced equation to convert from mol O2 to mol NO2, then converted to NO2...
2N2O5 heat-- 4NO2 + O2
1.618 g of O2 are produced, how much NO2 in grams are produced? I got 9.30 g NO2, is that right? I used 1 mol O2 = 32 g O2, and 1 mol NO2 = 46g NO2. I first converted g O2 to Mol O2 then used the balanced equation to convert from mol O2 to mol NO2, then converted to...
Suppose there is a tree of unknown height. I am standing 76 meters away from the tree and the top of the tree is 32 degrees from where I am standing. Could I find the height of the tree by this:
76 cos(32) =64
76 sin(32) =40
Magnitude = SQRT 64^2 + 40^2
Height of Tree equals 75 meters??
I been stuck on this homework problem for about an hour.
A truck covers 40.0 m in 8.25 s while smoothly slowing down to final speed of 2.05 m/s.
(a) Find the truck's original speed.
m/s
(b) Find its acceleration.
m/s2
I was told to use this V^2 = Vo^2 + 2AdeltaX but became lost.
[B][/B
I have a question here. Please can someone solve this. The question is:
There are 7 students of whom 2 are Americans, 2 are Russians and 3 Indians. hey have to stand in a line so that the two Americans are always together and the three Indians are always together. In how many ways...