Luricela

(a) What is the minimum work needed to push a 1150 kg car 240 m up a 17.5° incline with zero friction? (b) What is the minimum work needed if the effective coefficient of friction is 0.20?

A 74.0 kg firefighter climbs a flight of stairs 12.0 m high. How much work is required?

A car does 6.0 104 J of work in traveling 2.6 km at constant speed. What was the average retarding force (from all sources) acting on the car?

Squaw Valley ski area in California claims that its lifts can move 48700 people per hour. If the average lift carries people about 185 m (vertically) higher, estimate the maximum total power needed. (Assume an average mass per person of 70 kg.)

A sled is initially given a shove up a frictionless 24.0° incline. It reaches a maximum vertical height 1.10 m higher than where it started. What was its initial speed?

Two students on roller skates stand face-to-face, then push each other away. One student has a mass of 94 kg, the other 65 kg. Find the ratio of the velocities just after the hands lose contact.

The length of a simple pendulum is 0.72 m, the pendulum bob has a mass of 305 grams, and it is released at an angle of 10° to the vertical. a) With what frequency does it vibrate? Assume SHM. (b) What is the pendulum bob's speed when it passes through the...

A) What is the intensity of sound at 148 dB? Units: W/m^2. I found this to be 630.9573445 using Io*10^B/10 in which B= 148 dB. B)Compare it to that of a whisper at 20 dB. Using the same formula i find this to be 1e-8 but it is marked as wrong. Please help...

W=Force x displacement x cos of the angle. W=(mg)(d)(cos angle) W=(74 x 9.8)(12)(cos 0) W=(725.2)(12)(1) W=8702.4 J

i am trying.i actually answered one of my own questions earlier after looking further into class notes.sorry if it seemed like im using it to harvest ansewrs.i just have avery large assignment.n these are the few that i didn't get.and only needed hints as...

If you type this into google it will lead you to a website that explains it better. If you consider a pyramid of numbers, you may get confusing results, ... The best approach is to use pyramids of biomass, which include the total mass of living ... an org...

Acctually i just found the answer for the acceleration, its similar to what you said except that you don't square it.The tension is (mass)(acceleration).

no its just that this is in revolutions per second (goes around the whole circle) when it should be redious per second. most questions just give it in seconds so it would be correct the other way (unless of course it is given in revolutions per second lik...

Thank You drwls :) we did get a formula for frequncy similar to the one you gave me but the one i had didn't work. Once again Thank you for your help :)

The Io i used was (1*10^-12) for A and (1*10^-10) for B. That was according to my physics book. I got A correct with 630.9573445 W/m^2.