# Search results

1. ### Finding net electric force

i was wondering why my initial numbers were looking correct but still getting the wrong result.
2. ### Finding net electric force

You're right. I got +372 N total as my result (which came back correct!) Thank You!
3. ### Finding net electric force

Did you use the same number/equation as well? F(net(q1,3))= k(q1 *(3.0)(q3))/2(d)^2 = - ( (9.0e^9 N m^2/C^2) * 20e^-6 C * (3.0)(20e^-6 C) )/ 2 (0.11 m)^2 = - 446.3 N
4. ### Finding net electric force

i'm using +q(1,2) going right and -q(1,3) going left. I still get -446.281 N in the second force
5. ### Finding net electric force

Homework Statement Given that q = 20 µC and d = 11 cm, find the direction and magnitude of the net electric force exerted on the point charge q1 below. Homework Equations F(elect) = k (q1,q2)/d^2 The Attempt at a Solution 1. after converting each unit to its appropriate form, F(net...
6. ### Chemistry Question -- Opening a valve between two containers...

Homework Statement Two closes containers are connected by a valve, which initially separates the containers from each other. C Container A has 8.00 L of H2 at 3.00 atm and temperature 400 k. Container B has 6.00 L of O2 at 4.00 atm and temperature 400 k The valve is opened, the gases mix, and...
7. ### Implicit function

would i be able to find L by square rooting (w,h,ℓ) and then multiplying it with the 2? update: i manage to figure out the equation by doing just that. Thanks for your help!
8. ### Implicit function

Homework Statement The length ℓ, width w, and height h of a box change with time. At a certain instant the dimensions are ℓ = 4 m and w = h = 9 m, and ℓ and w are increasing at a rate of 1 m/s while his decreasing at a rate of 6 m/s. At that instant find the rates at which the following...
9. ### Finding time of a rocket

Homework Statement A model rocket takes off from ground level accelerating upward at a = 3.0 g. This upward acceleration lasts for a time τ = 15 s. Afterward the rocket continues upward, eventually stops rising, then falls back to the ground. How much time passes from the initial upward...
10. ### Vectors quantity

isn't the other vector the opposite diagonal to A+B?
11. ### Vectors quantity

So would creating a new vector like vector C = A+B?
12. ### Vectors quantity

i thought it was asking to add the components of the vector A and B while also figuring out the quantity |A+B|^2 - |A-B|^2?
13. ### Vectors quantity

they are vectors
14. ### Vectors quantity

Homework Statement Vector A has magnitude A = 4.0 units and is directed θA = 15◦ counterclockwise from the positive x-axis. Vector B has magnitude B = 4.0 units and is directed θB = 85◦ counterclockwise from the positive x-axis. Determine the following quantity: |A + B|^2 − |A − B|^2...
15. ### Rotation acceleration

Homework Statement A disk of radius 16 cm rotating around a fixed axis at its center is accelerated from rest to an angular velocity of +13rev/min in +0.27 rev. (A )Find the angular acceleration (in rad/s^2), which is assumed to be constant, during this time interval. (B) what is the total...
16. ### Finding Magnitude

Homework Statement Two blocks are stacked one on top of the other with mass m1 on top and m1/m2= 3.0. There is no friction between m2 and the ground, but the coefficient of friction between m1 and m2 are given by μk= 0.40 and μs= 0.50. For what magnitudes of force acting horizontally on m1 do...
17. ### Finding Local Max and Min values and saddle in mult. Calculu

Homework Statement Find the local maximum and minimum values and saddle points of the function f(x,y) = x^2 + xy + y^2 + y Homework Equations Local max/min critical points saddle The Attempt at a Solution 1) partial derivative: fx = 2x+y fy = x+2y+1 from here, i'm a little confuse on...
18. ### Bullet Collision Question

ah, you're right. i made a mistake on my sig figs. Thanks for the help! the answer was 2.48x10^-3
19. ### Bullet Collision Question

if i got my equation correct, the ratio should be: KE(after)/KE(before) = 2.48x10^-4 (which i got wrong)
20. ### Bullet Collision Question

So would the KE(after) = 1/2(1.234kg)(0.577m/s)^2 + 1/2(1.60164kg)(0.965 m/s)^2 = 0.951160797
21. ### Bullet Collision Question

Homework Statement A 6.64-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right. The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bullet passes completely through...
22. ### Uniform Circular Motion on a race track

Homework Statement On a banked race track, the smallest circular path on which cars can move has a radius of 116 m, while the largest has a radius of 153 m, as the drawing illustrates. The height of the outer wall is 11.6 m. Find (a) the smallest and (b) the largest speed at which cars can move...
23. ### Uniform Circular Motion of a centrifuge

got it. Thanks!
24. ### Uniform Circular Motion of a centrifuge

But isn't the second step necessary to covert my answer to rpm?
25. ### Uniform Circular Motion of a centrifuge

Homework Statement A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the...

Ok thanks.
27. ### Projectile Motion skateboarder

Also, do Vy=0? since the y direction is pointing upward
28. ### Projectile Motion skateboarder

Would the height of the (a) be 1.40 m + x since the height of the ramp is 1.40 m above the ground? Also, i'm a little confuse on how to find the magnitude of this problem.
29. ### Projectile Motion skateboarder

Homework Statement A skateboarder shoots off a ramp with a velocity of 5.30 m/s, directed at an angle of 52.0° above the horizontal. The end of the ramp is 1.40 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point...
30. ### Motion in Space: Velocity and Acceleration

Homework Statement For V(t) = (1+t)i + (t^2-2t)j find: 1. velocity 2.Acceleration 3. speed/length 4. Unit Tangent 5. tangential component 6. normal component at t=2 Homework Equations The Attempt at a Solution 1. v'(t) = <1,2t-2> = <1, 2(t-1)> 2. a(t) = <0,2> 3. length = Square root of...