# Search results

1. ### Critical angle homework

I found snails law. NiSinangle of Incidence=Nrsinangle of refraction. What should i do now?
2. ### Thermal energy of snow

Ya tks. I found the answer of 5.4X10 to the power of 10.
3. ### Thermal energy of snow

Isn't it Tf-Ti? Which is Tf=4 degrees celcius and Ti=-4 degrees celcius but isnt boiling point included at 0 degrees celcius?
4. ### Thermal energy of snow

"The Metromelt is capable of melting 150,000 kg of snow in one hour."
5. ### Thermal energy of snow

Can anyone help me for this Thermal energy question?
6. ### Thermal energy of snow

Homework Statement Assuming that the snow is -4 degrees celcius and that the water is dumped at +4 degrees celcius, calculate the amount of heat energy required to operate a metromelt for one hour. Homework Equations Q=mct Q=mLf *little f* The Attempt at a Solution I...
7. ### Critical angle homework

Ya i knw u can find the critical angle but i got the critical angle of diamond and n for water. I want to knw how to solve the angle between diamond and water.
8. ### Critical angle homework

Well the question is 2 sentences. Critical angle of diamond is n=2.42. Water n=1.33. Find the angle of incidence. My textbook says the angle is 33 degrees but i do not knw how it arrived at that answer.
9. ### Critical angle homework

Homework Statement The critical angle diamond (n=2.42) and water (n=1.33). Find the angle. Homework Equations The Attempt at a Solution I dun get how u find the angle with 2 n's. I need a solution.
10. ### Conservation of Energy and potential energy problem

its alrite and thanks
11. ### Conservation of Energy and potential energy problem

well i did 1.5X10^7 J=1/2mv square 1.5X10^7=(1/2)(40000)v square v square=750 v=27 m/s. Well to be more precise its 2.1189600X10^7-5.886000X10^6=1.5303600X10^7 1.5303600X10^7/0.15(40000)v square v square=765.18 v=27.6 rounded to 28 m/s. So according to that method. I subtract...
12. ### Conservation of Energy and potential energy problem

I found v=27 for B but i cant find the kinetic energy for C and D. As u told me i need EGa-EGb=EKb but i dun seem to have the correct answer for C and D.
13. ### Conservation of Energy and potential energy problem

So your saying i have that m=4.0X10^4. I got the potential energy for A which is 2.1X10^7, B which is 5.9X10^6, C which is 1.8X10^7, and D which is 1.4X10^7 and B's kinetic energy is 2.1X10^7-5.9X10^6=1.5X10^7. So how do i find the kinetic energy for C, D, and E. I also need to find the speed...
14. ### Conservation of Energy and potential energy problem

Now i have potential and kinetic energy. I need to find the speed of point B to D. I need a step by step solution with the formula.
15. ### Conservation of Energy and potential energy problem

Oh alrite i found the answer of 1.5 X 10 to the power of 7. From A subtract B using the Ek=Eg formula. Now i need to find the speed for points B, C, and D.
16. ### Conservation of Energy and potential energy problem

Well i never used that equation but i give it a try. mv square/2 +mgh 40000(0) square/2=0 40000(9.81)(54m)=2.1 X 10 to the power of 7. Now wat should i do?
17. ### Conservation of Energy and potential energy problem

I dun tink i got the correct answer. Ek=1/2mv square 5.9X10 to the power of 7=1/2(68kg)v square. I need a step by step solution for kinetic energy and speed from point B to D.
18. ### Conservation of Energy and potential energy problem

I need help solving its kinetic energy, with a step by step solution and its speed at points B, C and D. I knw Ek=1/2m square but iunno how to calculate that part even with mass, height for each point, and gravational potential energy. I also want to knw the speed for points B-D.
19. ### Conservation of Energy and potential energy problem

Homework Statement A 4.0X10 to the power of 4 kg roller coaster starts from rest at point A. Neglecting friction, calculate the potential energy relative to the ground, its kinetic energy, and its speed at points B, C and D. Height A=54m Height B=15m Height C=47m Height D=35m...
20. ### Homework problem- Work and energy problem

oh ic. Thanks alot. I figured out the answer. W=Fs W=3.4X10 to the power of 2 F=280 s=? so W=Fs 340=280s s=1.2m Therefore the stopping distance is 1.2m.
21. ### Homework problem- Work and energy problem

Nope i didnt receive or use those formulas before. So how would i find the distance?
22. ### Homework problem- Work and energy problem

I got an answer of 4.1 for acceleration but the question states. If she exerts a breaking frictional force of 280N, find her stopping distance. Is 4.1m her stopping distance?
23. ### Homework problem- Work and energy problem

I found F=deltra (mv)/time but i dun tink i got the right answer.
24. ### Homework problem- Work and energy problem

oh i got the kinetic energy of 3.4 X 10 to the power of 2 J. Thanks. For question b.) if she has a frictional force of 280N, how would i solve the stopping distance?
25. ### Homework problem- Work and energy problem

so 3.15 rounded to 3.20 sound right. I also need to knw the step by step solution for total kinetic energy after 15 secs. and If she exerts a breaking frictional force of 280 N, find her stopping distance.
26. ### Homework problem- Work and energy problem

Homework Statement A 68 kg in-line skater starts from rest and accelerates at 0.21 m/s square for 15s. a) Find her final velocty and total kinetic energy after the 15s of travel. b) If she exerts a breaking frictional force of 280N, find her stopping distance. Homework Equations...

thanks alot.
28. ### Find the index of refraction

Ya i did but can u type it step by step i knw how to plug it in the equation but i dun got that number.
29. ### Find the index of refraction

Like is it suppose to be crown glass, quartz, zircon, etc. Can someone help solve the equation step by step and tell me what glass it is.
30. ### Find the index of refraction

Homework Statement Suppose a convex lens is ground so that one surface has a radius of curvature of 30.0 cm and the opposing surface has a radius of curvature of 40.0 cm. The focal length is 34.2cm. What is the index of refraction of the lens? What kind of glass is the lens? Homework...