Homework Statement
A long, thin, straight wire of length L has a positive charge Q distributed uniformly along it. Use Gauss' Law to show that the electric field created by this wire at a radial distance r has a magnitude of E = λ/(2πεor), where λ = Q/L. (Hint: For a Gaussian surface, use a...
Homework Statement
Suppose you want to determine the electric field in a certain region of space. You have a small object of known charge, and in an instrument that measures magnitude and direction of the force exerted by object by the field.
(a) The object has a charge of +20.0 C, and...
Homework Statement
The following table shows the daily high tem-
peratures for a week in May. Determine the
change in temperature each day.
Sun. 76◦
Mon. 72◦
Tues. 80◦
Wed. 75◦
Thurs. 75◦
Fri. 74◦
Sat. 78◦
Find the net change in temperature (the...
Homework Statement
A weather balloon is designed to expand to
a maximum radius of 30 m when in flight at
its working altitude where the air pressure is
0.033 atm and the temperature is 95 K.
If the balloon is filled at atmospheric pres-
sure and 462 K, what is its radius at lift-off...
So, d = P X MM/RT
d = (0.7 atm)(20 g/mol)/(8.31 J/mol*K)(200 K)
d= 0.008423586
2 L * 0.008423586 = 1.684717208E-5 kg
KE = 1/2(1.68E-5)(499.227 m/s)^2 = 2.09 J (WRONG ANSWER)
AM I USING THE WRONG UNITS OR DID I DO A MATH ERROR???
Homework Statement
The internal energy of a monoatomic ideal gas such as neon is simply the total kinetic energy of all its atoms.
What is the internal energy of 2 liters of neon at a temperature of 200 K and pressure of 0.7 atm?
Homework Equations
PV = nRT
KE(ave) = 3/2kT
U =...
Homework Statement
A car tire gauge is used to fill a tire to a gauge pressure of 42.5 lb/in2 on a cold morning when the temperature is -16 C. Atmospheric pressure is 14.7 lb/in2 and 0 C = 273 K.
What would the tire gauge read when the tire has been heated up to 44.2 C?
Homework...
Homework Statement
A thin cylindrical shell and a solid cylinder have the same mass and radius. The two are released side by side and roll down, without slipping, from the top of an inclined plane that is 1 m above the ground. The acceleration of gravity is 9.8 m/s2.
Find the final linear...
Homework Statement
A spinning top has a moment of inertia of 0.0004 kg*m^2 and is initially at rest. It is free to rotate about a stationary axis. A string, wrapped around a peg along the axis of the top, is pulled in such a manner as to maintain a constant tension of 5.57 N in the string...
Homework Statement
Part 1:
You want to design a large, permanent space station so that no artificial gravity is necessary. You decide to shape it like a large coffee can of radius 322 m and rotate it about its central axis. The acceleration of gravity is 9.8 m/s2. What rotation speed...
More torque yay!!!
Homework Statement
A horizontal bar with a mass m suspended from one end is held by a cord with tension T, fastened at a distance D from the end of the bar that is attached to a wall with a frictionless pin. What is the torque about the pin exerted on the bar by the cord...
Homework Statement
A rod can pivot at one end and is free to rotate without friction about a vertical axis. A force F is applied at the other end, at an angle theta to the rod. If F were to be applied perpendicular to the rod, at what distance d from the axis of rotation should it be applied...
Homework Statement
Starting from rest, a 5 kg block slides 2.5 m down a rough 30 degree incline. The coefficient of kinetic friction between the block and the incline is 0.436. The acceleration of gravity is 9.8 m/s2.
Find the work done by the force of gravity.
Find the work done by...