Homework problem Definition and 405 Threads

Homework Statement a robot probe drops a camara off the rim of a 239 m high cliff on mars, where the freefall acceleration is -3.7 m/s^2. a. fiind the velocity wl which the camara hits the ground. b. find the tiime required for it to hit the ground. Homework Equations vf^2= vi^2+2ad...

Homework Statement The pipe assembly shown in the picture supports the vertical loads shown. Determine the reactions at the ball and socket joint (point A) and the tension in the two cords BC and BD. Homework Equations Sum of Forces = 0 Sum of Moments = 0The Attempt at a Solution I first...

Homework Statement In one part of a musical composition, the triangle player in an orchestra plays once every 12 beats. The tympani player plays once every 42 beats. How often do they play together? Homework Equations don't have any The Attempt at a Solution Insufficient...

Homework Statement Presidential elections are held every four years. Senators are elected every 6 years. If a senator was elected in the presidential election year of 2000, in what year would he or she campaign again during a presidential election year? Homework Equations dont know...

Homework Statement Margo has piano lessons every two weeks. Her brother Roberto has a soccer tournament every three weeks. Her sister Randa has an orthodontist appointment every four weeks. If they all have activities this Friday, how long will it be before all of their activities fall on...

Hi everybody, this is my first post on your forum and i hope someone can help me :) the problem is i can figure out how to approuch this problem :s i do know that the process of the air descending is adiabatic but still i can't get it :( thanks for your help guys in advance. Homework...

how do i show that f: [0,1) \rightarrow S^1; t \rightarrow (\cos{2 \pi t}, \sin{2 \pi t}) is a continuous bijection but not a homeomorphism. so i know i have to (i) show f is a continuous bijection (ii) show f^{-1} is not continuous so for (i), surjectivity: if i take a point (a,b)...

I posted this in the advanced forum by mistake so I'm am posting it here as I think it may be more appropriate in this forum. Homework Statement A motor boat is speeding at velocity W0 when the motor is turned off and a scoop is lowered into a still lake. The scoop captures flow with a cross...

Homework Statement For some reason, I cannot seem to get the derivative for this. Homework Equations f(a) =\frac {(2500+0.2t)(1+t)}{\sqrt {0.5t+2}} The Attempt at a Solution f(a) =\frac {(2500+0.2t)(1+t)}{\sqrt {0.5t+2}} \frac {(2500+0.2t)}{\sqrt {0.5t+2}} (1+t) From...

Can you check over my answers to see if my reasoning is correct? Homework Statement #3) "Yesterday I woke up and it was 20°F in my bedroom," said Mert to his old friend Mort. "That's nothing," replied Mort. "My room was -5.0°C." Who had the colder room, Mert or Mort? Homework Equations...

Homework Statement A certain storm cloud has a potential of 1.50 x 10^8 V relative to a tree. If, during a lightning storm, 50.0 C of charge is transferred through this potential difference and 1.00% of the energy is absorbed by the tree, how much sap in the tree can be boiled away? Model...

Homework Statement A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 79.0 m/s2 for 1.90 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground)...

Homework Statement A real number x \in R is called algebraic if there exist integers a_{0},a_{1},a_{2}...,a_{n}, not all zero, such that a_{n}x^{n} + a_{n}_{1}x^{n-1} + ... + a_{1}x + a_{0} = 0 Said another way, a real number is algebraic if it is the root of a polynomial with integer...

Is it possible for the critical angle to exist when light goes from water (n=1.33) into glass (n=1.5)? My used the formula sin(critical angle) = n1/n2. I'm a bit confused, should the numerator(n1) always be less dense compared to the denominator(n2).

A cheetah is hunting. Its prey runs for 3.2 s at a constant velocity of +10.0 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?

A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.1 m/s2. The breaks are applied for 1.60 s. (a) How fast is the car going at the end of the braking period? (b) How far has the car...

Homework Statement John walks 1.60 north, then turns right and walks 1.40 east. His speed is 1.80 during the entire stroll. If Jane starts at the same time and place as John, but walks in a straight line to the endpoint of John's stroll, at what speed should she walk if she wants to...

Could you help me solve this one : Write the the equations of the tangents of the parabole x^2=2y-4 that go through the origin of coordinates. Whats the surface of the figure formed by the parabole and the tangents. I am not sure i have translated thi one in an understanding way :(.

If body A exerts an impulse of say +2Ns on B, then does body A exert an impulse of -2Ns on B providing no external forces act? Thanks

Homework Statement A photon of wavelength 250 nm ejects an electron from a metal. The ejected electron has a de Broglie wavelength of 0.85 nm. (a) Calculate the kinetic energy of the electron. (b) Assuming that the kinetic energy found in (a) is the maximum kinetic energy that it could...

Homework Statement "A car travels a certain distance along a straight road and on the way must stop at traffic lights and obey local speed limits. The figure (not pictured but info filled in below) shows the distance the car travels as a function of time. Choose all the correct answers which...

Homework Statement Point M is the midpoint of RT ( with the lin on top of RT).RM = x and RT = 4x-6. Find the value of x. Homework Equations The Attempt at a Solution I wrote out the equation (RT=4x-6)/2=RM but I am not sure if this is the right approach.

Homework Statement Using Comparison test and LCT, determine whether it is convergent or divergent: (summation n=1 to infinity) sqrt(n+2)/(2n^2+n+1) Homework Equations The Attempt at a Solution i compared it with sqrt(x)/2n^2 which is 1/2n^(3/2) and then the answer showed...

I'm having trouble with this homework problem! Current & Magnetic Field! This problem deals with current and the magnetic fields around these 2 parallel wires. The question is listed below, as is the link to the picture. Thanks SO Much for your help...

Ok, so like i am in this very complicated philosophie of math course with like a little science fiction writing on the side for extra credit, so since the class is like a joke cause i mean it is philosophy after all and not maths (rock on math! why is it that math seems to be useful in...

Homework Statement A golfer rides in a golf cart at a speed of 3.10 m/s for 24.0 s. She then gets out of the cart and starts walking at an average speed of 1.30 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.90 m/s...

what is the rotational speed of the hand on a clock that measures the minutes? what is the rotational speed of the hand on a clock that measures the seconds?

I cannot figure out this problem...can someone help me? A 3500 air-gap capacitor is connected to a 32 battery. If a piece of mica fills the space between the plates, how much charge will flow from the battery? Express your answer using two significant figures.

Any assistance given is greatly appreciated. Thanks in advance. http://img3.imageshack.us/img3/5519/hw3statics.jpg Thanks again.

\int csc dx = ? [b]I just am seeking confirmation as to whether or not I did this correctly. I apologize beforehand for any formatting errors. \int csc(x) dx = \int 1/sin(x) dx u = sin(x) du = cos(x)dx du / cos(x) = dx u2 = sin2(x) u2 = 1 - cos2(x) \sqrt{}{u^2-1} = cos(x) du...

Homework Statement A carton is given an initial speed of 3.0 m/s up a 22.0 degree plane. a.) How far up the plane will it go? b.) How much time elapses before it returns to its starting point? Ignore friction. Homework Equations F=ma The Attempt at a Solution I have no clue. If...

A fluid of density (rho) flows through a horizontal pipe with negligible viscosity. The flow is streamline with constant flow rate. The diameter of the pipe at Point 1 is d and the flow speed is v. If the diameter of the pipe at Point 2 is d/3, then the pressure at Point 2 is...

Homework Statement The combination of an applied force and a friction force produces a constant total torque of 36.0 N·m on a wheel rotating about a fixed axis. The applied force acts for 6.00 s. During this time the angular speed of the wheel increases from 0 to 10.0 rad/s. The applied force...

http://img502.imageshack.us/img502/8941/webworks4ez6.jpg" . The first answer is 2.5V, but I'm having trouble getting ωt I'm using the equation: V = V0 sin(ωt) --> 2.5V = 5V sin(ωt) --> sin-1(2.5V/5V) = ωt --> ωt = 30 degrees but that's incorrect and so is -30 degrees I've just used an...

Homework Statement Distance of Earth from Sun = 1.50 x 10^11m Period = 365.2 days Distance of Mars from Sun = 2.28 x 10^11km Period of Mars in Earth Years? Homework Equations (Ta/Tb)^2 = (Ra/Rb)^3 The Attempt at a Solution (365.2 days/Tm)^2 =(1.50 x 10^11m/2.28x10^14m)^3...

Homework Statement A simplified model of a bicycle of mass M has two tires that each comes into contact with the ground at a point. The wheelbase of this bicycle (the distance between the points of contact with the ground) is w, and the center of mass of the bicycle is located midway between...

Homework Statement A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. How do i determine angular frequency? A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. This object reaches a maximum position of 12 cm from equilibrium. Determine: a.) angular frequency...

how do i solve this integral integral of [ (1+y^2) / (1-y) ] dy ?? i tried my best but i couldn't solve. help me out please.

1. use the parametric equations of a cycloid ( x=a(t-sint), and y=a(1-cost) ) to show that y=y(x) is the solution of the differential equation for any parameter a. Find the relationship between the radius a in the parametric equations and the constant C in y(1+y`2)=C. 2. Solve the equation...

Homework Statement A thin tube, sealed at both ends, is 1.00 m long. It initially lies horizontally, with the middle 10.0 cm containing mercury, and the two ends containing air at standard atmospheric pressure: See picture in attachment If the tube is now turned to a vertical position...

If the determinant of a 3x3 matrix A is det(A)=5, and the matrix B is obtained from A by multiplying the first column by 8, then det(B)=? I really haven't tried anything for this question; I'm not even sure where to start.

Homework Statement A machine does work at a rate given by , P=ct^2 where c= 18 W/s^2 and t is time. Find the work done by the machine between 9.0s and 18s . Homework Equations P=w/t The Attempt at a Solution no ideas

Homework Statement A rain forest biologist is pulling a 50 kg crate of bananas at a constant rate from the ground to the canopy with a rope on a pulley. The distance that the crate has to go is 80 m. When the crate has traveled 40 m, a monkey with a mass of 50 kg jumps on to the top of the...

On a banked race track, the smallest circular path on which cars can move has a radius of 111 m, while the largest has a radius of 157 m, as the drawing illustrates. The height of the outer wall is 15.7 m. Find (a) the smallest and (b) the largest speed at which cars can move on this track...

Hi there, I need help with understanding this guy's solution thanks! The kinetic friction force will be up the slide to oppose the motion. We choose the positive direction in the direction of the acceleration. From the force diagram for the child, we have ?F = ma: x-component: mg sin...

Homework Statement A 2450 kg car traveling to the west at 16.4 m/s slows down uniformly under a force of 8930 N to the east. a) How much force would be required to cause the same acceleration on a car of mass 3170 kg? Answer in units of N. Homework Equations The Attempt at a...

Tipping something given its center of mass? My LAST homework problem! Homework Statement A rectangular block of mass 3.0 kg is at rest on a table. Its height (in its current position) is 0.7 m, but because its composition varies vertically, its center of mass is at a height of 0.40 meters...

Homework Statement A 1170 resistor, a 1.46 μF capacitor, and a 2.7 H inductor are connected in series across a 350 Hz AC source for which the maximum voltage is 230 V. Calculate the impedance of the circuit. Homework Equations Z=sqrt(R^2+(XL-XC)^20 XL=2*pi*f*L XC=1 /...

Homework Statement 13) A large metallic sphere insulated from ground is charged with an electrostatic generator while a student standing on an insulating stool holds the sphere. Why is it safe to do this? Why would it not be safe for another person to touch the sphere after it had been...

This question, I have absolutely no idea what to do. Question: Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45 degrees with the vertical, steps off his tree limb, and swings down and then up to Jane's open arms. When...