Recent content by Touchme

Ah shoot, I've made the most stupid mistake ever. I solved it.

Homework Statement Two long parallel wires, each with a mass per unit length of 43 g/m, are supported in a horizontal plane by 6.0 cm long strings, as shown in Figure P19.64. Each wire carries the same current I, causing the wires to repel each other so that the angle between the supporting...

sry forgot the question. I edited the post. I was thinking of using projectile motion to solve this question, but I can't solve for the force that moves the electron towards the positive plate. I know F = qE edit: omg I just told myself how to solve this. Nevermind, I think I know how to do...

Homework Statement An electron is fired at a speed vo = 5.0 106 m/s and at an angle o = -44° between two parallel conducting plates that are D = 3.7 mm apart, as in Figure P16.66. The voltage difference between the plates is V = 100 V. (a) Determine how close, d, the electron will get to...

Homework Statement The energy stored in a 55.0 µF capacitor is used to melt a 7.00 mg sample of lead. To what voltage must the capacitor be initially charged, assuming that the initial temperature of the lead is 20.0°C? Lead has a specific heat of 128 J/kg°C, a melting point of 327.3°C, and...

The acceleration would be a = ((d(air) - d(gas))V - m)g/(m + d(gas)V) So... I neglected mass but it says a light balloon... a = (1.29-0.175)(9.8)V/(0.175V) a=62.44 m/s Hmmm... then I use the period formula and... GOT IT! thanks OlderDan =D

Homework Statement A light balloon filled with helium of density 0.175 kg/m3 is tied to a light string of length L = 3.35 m. The string is tied to the ground, forming an "inverted" simple pendulum (Fig. P13.63a). If the balloon is displaced slightly from equilibrium, as in Figure P13.63b, show...

Homework Statement An expandable cylinder has its top connected to a spring with force constant 2.00 103 N/m. (See Fig. P10.58.) The cylinder is filled with 6.00 L of gas with the spring relaxed at a pressure of 1.00 atm and a temperature of 20.0°C. I searched for a similar question...

ooo thanks for your help, I managed to solve it using B=pVg. I found all the forces acting on the balloon and set that equal to the weight of air. Thanks

density of air is 1.29 and density of He is 0.179 mass of air = 2161.4 mass of He = 299.9 299.9 + 0.25 = 300.15 the mass of the balloon + He Im still not sure what to do here. How is the net lift relative to finding h? (I thought it was a pressure problem because it came from a chapter...

Homework Statement A helium-filled balloon at atmospheric pressure is tied to a 3.1 m long, 0.100 kg string. The balloon is spherical with a radius of 0.40 m. When released, it lifts a length (h) of the string and then remains in equilibrium as in Figure P9.78. Determine the value of h. When...

Use conservation of energy to determine the angular speed of the spool shown in Figure P8.36 after the 3.00 kg bucket has fallen 4.65 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds. I used conservation of energy...

The pulley in Figure P8.59 has a moment of inertia of 6.0 kgm2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless. Find the acceleration of each mass when m1 = 2.9 kg and m2 = 5.3 kg. Im not sure how to get started. What I did was...

thank you so much.

sorry for not clarifying my question. I am trying to solve for x. The question is: If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?