# Recent content by xgoddess210

1. ### Sound Intensity of a Whisper

It's a mastering physics problem.
2. ### Sound Intensity of a Whisper

I tried using 10^-10 as the power emitted (got that from a website) and this is what I did: I= 10^-10/ 4pi*3^2 I= 8.8*10^-13 That was wrong, so I'm really at a loss here.
3. ### Sound Intensity of a Whisper

Homework Statement What is the sound intensity of a whisper at a distance of 3.0 m, in W/m^2 ? What is the corresponding sound intensity level in dB? Homework Equations I=P/4*pi*r^2 The Attempt at a Solution I tried looking up what the power of a whisper was and I can't find...
4. ### Unit conversion difficulties on simple problem

oh! The equation I have for work is W=Fx, but all that is given to me is two velocities and a mass. Force is m*a so w=m*a*x. I guess I'm still at a loss here.
5. ### Unit conversion difficulties on simple problem

I tried that- It gives me an answer of 3.74, but that is wrong. This doesn't really make sense to me.
6. ### Unit conversion difficulties on simple problem

Homework Statement A 55 g particle is moving to the left at 27 m/s. How much work must be done on the particle to cause it to move to the right at 41 m/s? Answer in joules Homework Equations The Attempt at a Solution 27-(-41)=68 , 68*55= 3750 the units here are grams m/s. I...
7. ### Work, displacement, and gravity problem!

I think I'm starting to get it now. Thank you.
8. ### Work, displacement, and gravity problem!

Homework Statement A 1.4 kg book is lying on a 0.80 m-high table. You pick it up and place it on a bookshelf 2.2 m above the floor. 1) How much work does your hand do on the book? 2.) How much work does gravity do on the book? [solved] Homework Equations Force*displacement=work...
9. ### Friction and a skier

ok. The work energy theorem is basically saying that since energy is always conserved, something had to provide energy and its done through work. So in less words it is the relationship between the work done and the change in energy. I think gravity is doing most of the work by pulling the...
10. ### Friction and a skier

Homework Statement You are a member of an alpine rescue team and must get a box of supplies, with mass 2.20 kg, up an incline of constant slope angle 30.0 degrees so that it reaches a stranded skier who is a vertical distance 2.80 m above the bottom of the incline. There is some friction...
11. ### Locomotive, friction, and speed question

Honestly, I had no idea what I was doing. I tried looking at how someone solved the same problem with different numbers and just plugged my numbers in but it didn't work.
12. ### Locomotive, friction, and speed question

Homework Statement A 4.6×104 kg locomotive, with steel wheels, is traveling at 14 m/s on steel rails when its engine and brakes both fail. The coefficient of friction is 1.6×10−3. 1.) How far will the locomotive roll before it comes to a stop? Answer in meters using two significant...
13. ### Quick question about forces

Any comments or thoughts would be appreciated =]
14. ### Quick question about forces

Quick question about forces!!! Homework Statement A skier is sliding down a 15 degree slope. Friction is not negligible. Identify all forces on the skier. Homework Equations n/a The Attempt at a Solution The choices are: Tension, Kinetic Friction, Weight, Static Friction...
15. ### Forces on blocks with 3 different masses.

Ohhhhhh! I get it now, lol! Thank you! =]