Recent content by Juntao

Hi, I am trying to write a loop that will check a users input to be between a certain numeric range in C. The thing is, I expect the person to enter a number, not a character. When the person enters a character, the loop becomes infinite. Thats the problem. If you look at example source...

help with 2 "simple" probability probs Ok, I'm having a hard time with probability. First problem. A restaurant offers a choice of 4 appetizers, 14 entrees, 6 desserts, and 5 beverages. How many different meals are possible if a diner intends to order only three courses? (consider the...

Hey Ok, the formula is right, you got all the information right under your nose. You're just interpreting wrong. We know that the wires, let's denote them A and B, are going to have equal and opposite forces. The equation is F_BA = I_B*L X(cross) B F_BA = I_B*L *...

Ok, this problem is bugging. I have to find the total equivalent resistance. I have included a picture below. There are numbers to this problem, but I want to figure out how to do this in terms of variables first. First I added R3 and R4 in series R34=R3+R4 Then I figured out R234=...

awesome thank you so much...you are a true godsend.

help with simple problem:( An electric wheelchair is powered by two 12 V lead acid batteries and an electric motor rated at a maximum output power of 1 hp. Each battery has an energy capacity of 600 W-hrs. The motor has an efficiency rating of 89%. Assuming that the batteries are fully charged...

My bad, I computed the answer wrong. Now I feel like an idiot. Supposed to be -.0063N, not 2.52N. :( Okay, now is part 2 and 3 done the same way? Sorry, but I suck at using the right hand rule. I know that I curl my fingers in the direction of the magnetic field, but sometimes I don't get...

Ok, I figured out why its negative. Right hand rule shows me the angle between the magnetic field and the current is -90 degrees. Also, I know that's the RIGHT answer because the computer told me so. Sorry if I did not indicate that earlier. So how do I setup these last two parts? Do I have to...

Sup all. I need help setting this problem up. A right-triangular current loop has two 45° angles and a hypotenuse a = 5 cm. The loop lies in the x-y plane, with its hypotenuse parallel to the y-axis. A net current I = 0.42 A circulates in the loop in the direction shown in the figure. A...

A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 420 cm2. It is filled with oil of density 730 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1000 kg at equal fluid levels? b) With the lift in balance with equal fluid levels...

1) Can you go over how'd you get that 3.48 km/sec please? I figured out the force, so it was 9.8N or 10 N, and using F=ma, I divided the force by mass of the rocket, to get an acceleration of .07m/sec^2 Then using that V^2=vo^2+2ax a=.07 x= 1000km v0= 0 ? so then final V I get...

A 140 kg rocket is moving radially outward from the Earth at an altitude of 200 km above the surface with a velocity of 3.5 km/sec. At this point, its final stage engine shuts off. a)Ignoring any minor air resistance, what is the rocket's velocity 1000km above the surface of the earth? b)...

I've added a picture. The system shown to the right is in equilibrium with the center string exactly horizontal. Mass # 1 = 42 kg. Mass # 2 = 50 kg. È = 31 degrees. =========== A) Tension in left most string? B) Tension in center string? C) Tension in right string? D) What is the...

Picture is attached. The above figure shows a uniform iron beam of mass 254 kg and length L = 3 m. The cable holding the beam in place can take a tension of 1300 N before it breaks. (You may ignore the small mass of the cable in this calculation.) ====== a)What minimum length of the...

Thanks for the tip DocAl! I figured out the answer. Yes! I learn something new everytime I post here. :smile: