# Search results

1. ### Law of Refraction

This seems really easy but I am having a really hard time getting the correct answer to this question. Any help would be much appreciated. A ray in air is incident on a glass plate whose index of refraction is 1.60. The angle of refraction is one half the angle of reflection. The angle of...
2. ### Moment of Inertia and Center of Mass for Point Particles

I am having difficulty solving the first part of this problem. I have tried to many ways to find the ratio of m_a/m_b but I can't seem to get the correct answer. Can someone point me in the right direction. Thanks.
3. ### Maximum elevation

Thank you. This is what I got 160m-[0-(80m/s)^2/2(9.8m/s^2)]=486.5m Also, I had another question about horizontal projectile motion. Why does the distance of two packages steadily increase as they fall out of a plane going at constant speed. I thought the distance would remain...
4. ### Maximum elevation

Problem 1 x=160m and v=80m/s Problem 2 x_0=160m, v_0=80m/s, a=? if it stopped accelerating, I would assume that the acceleration would be decreasing as the rocket coasted upward. Would this be correct?
5. ### Maximum elevation

This problem seems simple but I'm just not getting the correct answer, please help thank you. A test rocket is fired straigt up from rest with a net accerleration of 20m/s^2. After 4 seconds the motor turns off, but the rocket continues to coast upward. What maximum elevation does the rocket...
6. ### G1 Phase

I think I figured out question 2. Since the question states that there is no recombination than the F1 progeny would have to come out 1/2 XXYY and the other 1/2 xxyy. Same goes for the F2 generation. So the answer must be d, right?
7. ### G1 Phase

G1 Phase and Genotype I need help with two questions. I am unable to find the first answer from my book. I have an idea of what the answer is but I'm not positive. Thank you. At the G1 phase of the cell cycle, a eukaryotic chromosome consists of a)one long linear DNA molecule...
8. ### LaGrange Multiplier

Find the points at which the function f(x,y,z)=x^8+y^8+z^8 achieves its minimum on the surface x^4+y^4+z^4=4. I know 8x^7=(lamda)4x^3 8y^7=(lamda)4y^3 8z^7=(lamda)4z^3 x^4+y^4+z^4=4 Case1: x not equal to 0, y not equal to 0, and z not equal to 0 I get 3(4th root of 4/3 to the eigth)...
9. ### Double integral and polar coord

What if D is a closed disk with radius 1 and center (1,0). That would make the polar coord. x=(r cos(theta)-1) and y=(r sin (theta)).

11. ### Fence dimensions calculus help

A rectangular study area is to be enclosed by a fence and divided into two equal parts, with a fence running along the division parallel to one of the sides. If the total area is 384 ft^2, find the dimensions of the study area that will minimize the total length of the fence. How much fence...
12. ### Average Total Force

ooh..ok So I would use the pythagorean theorem to find the angle and then use equation a=g sin (theta). Once I have found "a" then I can calculate f=ma. Am I on the right track? Thanks!
13. ### Average Total Force

Interesting...that is all the information I was given. So I wouldn't calculate acceleration since the cyclist is working against gravity. If I used f=mg (g=-9.8m/s^2)would that determine the total force?
14. ### Average Total Force

How do I go about solving this equation. Thanks. A 50kg cyclist, pedaling at 20 km/hr = 5.56m/s, climbs a 1 km hill in 30mins (.556m/s). What average total force on her bicycle is required for her to make it up the hill in this amount of time? I know that I have to find the acceleration...
15. ### Accleration and angle

I've figured out the problem with your help. Thank you!
16. ### Accleration and angle

Please help me with this question. I understand how to calculate the velocity from the given conditions but I don't know how to figure out the acceleration or the angle. Thanks! A cart is released from rest at the top of a perfectly frictionless air track. After an elapsed time delta t =...