Recent content by Symstar

Just an update... since the rider coasts down the hill but isn't accelerating, we must assume that there is a retardant force which must also be factored in when going uphill. This is where I went wrong. Kind of a trick question... blah!

The site where I submit my homework =/ I can't find any problem with it either, so I don't know what's up - guess I'll go ask the professor tomorrow. Thanks for checking my work and please let me know if you do think of somewhere I went wrong.

Homework Statement A bicyclist coasts down a 6.0 degree hill at a steady speed of 4.5 m/s. Assuming a total mass of 60 kg (bicycle plus rider), what must be the cyclist's power output to climb the same hill at the same speed? Homework Equations Newton's 1st law P=W/t The Attempt at a...

Homework Statement A 2500 kg space vehicle, initially at rest, falls vertically from a height of 3100 km above the Earth's surface. Homework Equations \frac{m_1m_2}{r^2}G=F_g W=\int_a^b Fcos\theta dl The Attempt at a Solution W=\int_a^b F_g dl r=r_{Earth} + r_{ship} W=\int_a^b...

Thanks, I was a little thrown off by the thrust out of the back of the plane I guess.

Silly mistake, thanks for the help!

Homework Statement A 17000kg jet takes off from an aircraft carrier via a catapult. The gases thrust out from the jet's engines exert a constant force of 160 kN on the jet;the force exerted on the jet by the catapult is plotted in the figure b. a)Determine the work done on the jet by the...

Homework Statement You are an astronaut in the space shuttle pursuing a satellite in need of repair. You are in a circular orbit of the same radius as the satellite (400 km above the Earth), but 20 km behind it. How long will it take to overtake the satellite if you reduce your orbital...

Homework Statement Two identical particles, each of mass m, are located on the x-axis at x = +x0 and x = -x0. Determine a formula for the gravitational field due to these two particles for points on the y axis; that is, write \vec{g} as a function of y, m, x0, and so on. Express your...

Shameless bump - still haven't resolved this question :(

dv/dt = atan correct? So would I need to integrate? \int a_{tan} = \int b + ct^2 \frac{dv}{dt}= bt+\tfrac{1}{3}ct^3 And it seems logical in our case that +C would actually be +v0 Which would end up giving me: F_R=m\frac{(v_0+bt+\tfrac{1}{3}ct^3)^2}{r} Which I just confirmed to be the...

F_{net}=cv-mg=(-1.2*10^4)(-6.5)-65(9.8)=77363 F_{net}=m\tfrac{v_s}{t} 77363=65(\tfrac{0.13}{t} t=1.09*10^{-4} This is also an incorrect answer =/

Homework Statement An object of mass m is constrained to move in a circle of radius r. Its tangential acceleration as a function of time is given by a_{tan} = b + ct^2, where b and c are constants. A) If v = v_0 at t = 0, determine the tangential component of the force, F_{\tan }, acting on...

If you mean: F_{net}=cv-mg I can solve for it, but do I use 6.5 as my value for v? I still don't know what to do with the resulting value? Doesn't that still have the same problem of assuming constant acceleration?

Ah, yes. As velocity decreases, the acceleration does as well. This is problematic for me, however, as I have not worked with non-constant accelerations. How should I go about solving this problem?