Hill Definition and 313 Threads

http://www.spaceflightnow.com/news/n0509/01marsrovers/ Astounding to think the rovers only had a such a limited life span expectation to begin with, yet they are still going so strong nearly two years on. I wonder if they could carry on for a few more years yet?! After all the Martian...

[FONT=Arial]I have an assignment question, it states: Surprisingly little advantage is gained by getting a running start in a downhill race. To demonstrate this, claculate the final speed of a skier who skis down a hill 80-m-high with negligible friction (a) if her initial speed is zero; (b) if...

Suppose you are climbing a hill whose shape is given by the equation z = 1000 - 0.01x^2 - 0.02y^2, where x, y, and z are measure in meters, and you are standing at a point with coordinates (50,80,847). The positive x-axis points east and the positive y-axis points north. (a)If you walk due...

Right now I'm an undergraduate (first year student) studying physics and computer science at NC State University. This is quite an ugly, unfriendly school and I'm strongly considering transferring to Carolina. Does anybody have any opinions on UNC's physics and/or computer science curricula vs...

http://www.latimes.com/news/nationworld/iraq/la-fg-troops18nov18,0,6045845,print.story Getting ready for the draft?

You and your dog run up a hill that is a mile long. Your dog runs half as fast as you. When you reach the top you immediately head back down. When you meet your dog, on your way down, he turns to follow you to the bottom. When your dog reaches the bottom, how far has he run?

I tried working this problem- but it doesn't come out right.. any help? My answers are in blue. :cry: --- A child holds a sled on a frictionless, snowcovered hill, inclinded at an angle of 27 degrees. 1) If the sled weights 60 N, find the force exerted on the rope by the child. Answer...

This is supposed to be a hard question... A 1900kg car experiences a combinded force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 27m/s. Going up a hill, the car's engine needs to produce 47 hp (1horsepower=745.7 Watts) more power to...

A city planner is working on the redesign of a hilly portion of a city. An important consideration is how steep the roads can be so that even low-powered cars can get up the hills without slowing down. It is given that a particular small car, with a mass of 1500 kg, can accelerate on a level...

Is there a simple way to calculate or gauge the gradient of a hill?

jus one more qn on potenital n kinetic energy guys... for instance a ball is at the top of hill A and now is let go...and after hill A there's one more hill/...hill B...and hill B is taller than hill A... will the ball be able to climb hill B? i noe its got to do with PE and KE...but...

The grade of a hill is a slope and is stated as a percent. What would the horizontal run be for a hill with a vertical rise of 800 feet and a grade of 8%? :confused:

Ok now, i know it says that i should show the work I've done on the question. Problem is, I have no idea where to start. So here is the question: Assume a cyclist of weight w can exert a force on the pedals equal to 0.90w on the average. If the pedals rotate in a circle of radius 18cm, the...