Recent content by pippintook

Homework Statement The Babblers have decided to build a tower that would reach the top of Rock Candy Mountain. For brick they used large sugar cubes ( = 1500 kg/m3). The compressive strength (stress) of sugar cubes is 6.0 MPa. How tall of a tower can the Babblers build? Homework Equations...

Well, my problem is more how I find L than how to find strain I guess.

A 10-m long cable has a "No Hippos in the Pool" sign weighing 25-N suspended from the middle of the cable. The cable stretches by 2.5 cm. What is the strain in the cable? I know strain is ΔL/L0, but don't really know how that plays out in this scenario. If you could give me the first step or...

Awesome. That's what I thought, but when I was experimenting with springs the constant was always a lot smaller so I got confused :P

A spring 150-cm long extends to a length of 155 cm when it supports a load of 55 N. Determine the spring constant. F = kx x1= 1.5 m x2= 1.55 m F = 55 N k = ? Now, "x" in F = kx is x2-x1, right? So the formula would be 55 = .05k? Sorry, I know this is simple, I just am having a momentary lapse.

A gallon of gasoline has a chemical PE of 1.2 x 10^8 J. If a 2000 kg car gets 40 km/gallon, what is the average force on the car? Assume constant speed and remember the force on the car is applied over the total distance traveled. What is the coefficient of friction? I tried PE = mgx, using m...

A 40,000 kg truck traveling on I-70 leaves Denver (elevation 5280', mile marker 244) and goes over Rabbit Ears pass (elevation 11,840', mile marker 238) while maintaining 50 mph. What is the horse power rating on his engine? The formulas I used are as follows: power = work/time work =...

A 1000 kg car traveling on a road that runs straight up a hill reaches the rounded crest at 25 m/s. If the hill at that point has a radius of curvature of - in a vertical plane - 75 m, what is the net downward force acting on the car at the instant it is horizontal at the very peak? How fast...

Wow. Ok, so I've found "a", but still don't know how to get FN, since I don't have the mass or force. I know there's some really obvious formula, but I CANNOT remember it.

A flatbed tractor trailer takes off from a stop sign on a level road. If a box on the back slides back 10 meters while the truck goes forward 50 meters and attains a speed of 15 m/s, what is the coefficient of friction (μ) between the bed and the box? Assume the bed to be at least 10 meters...

One cold winter day, a tractor gets stuck in a ditch. The operator hooks a tow chain to a nearby tree and attempts to move the tractor by jumping up and down on the chain. If the chain is 10 meters long and is stretched level one meter above the ground, and the tree is stationary, how far does...

A coin is dropped from a height of 750 feet. The height, s, (measured in feet), at time, t (measured in seconds), is given by s= -16t2 + 750. a) Find the average velocity on the interval [1, 3]. b) Find the instantaneous velocity when t = 3. c) How long does it take for the coin to hit the...

A balloon rises at the fate of 8 feet per second from a point on the ground 60 ft. from an observer. Find the rate of change of the angle of elevation when the balloon is 25 feet above the ground I converted 8 ft/s to 2.44 m/s2 to make it easier. I also figured the angle of elevation when the...

A jetliner can fly 6.00 hours on a full load of fuel. Without any wind it flies at a speed of 240 m/s. The plane is to make a roundtrip by heading due west for a certain distance, turning around, and then heading due east for the return trip. During the entire flight, however, the plane...

A bullet leaves the barrel of a rifle at 1000 m/s. If the gun barrel is 50 cm long, what is the acceleration of the bullet? For this problem, I used v^2 = u^2 + 2ax, but got like 1000000 m/s^2 for my answer. Is this right? It seems like a ridiculous solution. A driver sees a slow...