# Search results

1. ### Solving logarithm equation help?

Homework Statement log2(x+2)=log2x2 -log base 2(X+2)= log base 2 (x2) The Attempt at a Solution I know the answer is supposed to be -1 and 2, but I get the wrong answer every time I try. I tried bringing log2x2 over to the other side and then got log2(2/x) which got me nowhere...
2. ### Circular Motion

Homework Statement A ball has a radius of 2.25 m. What is the slowest speed of the ball at the bottom which will just make it around at the top of the path? The Attempt at a Solution I dont even know where to start with this problem. I dont understand it. Any help would be greatly...
3. ### A rock is thrown at an angle of 17 degrees above the horizontal at 28.5 m/s, from the

Homework Statement A rock is thrown at an angle of 17 degrees above the horizontal at 28.5 m/s, from the ground. a)How high will the rock rise above the ground? b)What is the horizontal speed of the rock at the top of its flight? c) How long will it take the rock to reach a vertical...

Homework Statement (cube root \sqrt[]{}x^4 * \sqrt[]{}x^5)^-2 Honestly, I tried and my answer didnt make any sense...The answer is supposed to be 1/(x^23/3) How would I go about solving this? Any help would be appreciated :) Also how would I solve the cube root of 7 * the cube root of 49?
5. ### Help me understand frictional force?

Homework Statement If a force of 150 newtions is needed for a 600 newton weight to overcome friction, what is the coefficient of friction? The Attempt at a Solution I'm really confused, I drew a force diagram but it didnt help. I know I need to get the frictional force to solve for the...
6. ### Find the mass of object knowing the applied force and coefficient of friction

Homework Statement If a force of 45 newtons is needed to overcome friction and the coefficient of friction=0.26, what is the mass of the object? The Attempt at a Solution So would I need to find the frictional force first? But then I can't use the equation: (frictional...
7. ### Minimal Force question

Homework Statement A 20 kg block is on a surface where the coefficient of friction is 0.30. Find the minimal force needed to have the block more slowly at a constant speed. The Attempt at a Solution So I did coefficient of friction(mass)(gravity)=frictional force 20(0.3)(9.8)=58.86...
8. ### Force fishing problem

Homework Statement A fishing hooks a 2 kg fish on a line that can only sustain a max of 38 N before snapping. At one point, the fish pulls back with a force of 40 N. What is the min acceleration with which you must play out the line during this time to keep the line from breaking? The...
9. ### Find frictional force from mass and acceleration

Homework Statement Acceleration of a car is -12.2 m/s/s. The car has a mass of 925 kg. Find the frictional force. The Attempt at a Solution So A=-12.2, M=925 kg Fnet=MA =925(-12.2) = -11285 N Fg=mg =925(9.8) =9065 N Since there is no vertical direction...
10. ### Radicals-getting a rational denominator

So one of my problems is the square root of 768/square root of 384. I tried multiplying it by the square root of 384/square root of 384, but i ended up with a crazy answer. Should I simply the radicals first and then try it?....never mind, I divide radical 768/radical 384 to get radical 2...
11. ### Simplifying Radicals with varibles?

I understand that the square root of (for example)j^16 is j^8. But when you have an odd squared root, like the square root of j^19, would it be j^9square root of j? Another quick question 12 radical 36 would be 72? Sorry, I know this is basic algebra, but I really have forgotten how to do...
12. ### What is the shape of a mass vs. acceleration graph?

The mass is constant, and there is a varying force. So would the mass be the dependent value(y-axis) and the acceleration be the independent value(x-axis)? I think the mass is the dependent value so when I graphed it the line went straight across(horizontal). Is this right? I'm really...