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...
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.
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.
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.
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...
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.
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...
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.
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?
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.
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.
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...
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.
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?
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?
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.
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...
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...