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1. Magnetic field of earth on airplane

Homework Statement This isn't a homework problem with variables and numbers; it is a concept question: An airplane is flying west in level flight over Massachusetts, where the Earth’s magnetic field is directed downward below the horizontal in a northerly direction. As a result of the...
2. Magnetic Fields and Current Loops

Homework Statement A long, straight wire carries a current of 14 A. Next to the wire is a square loop with sides 1.0m in length. The loop carries a current of 2.5A in the same direction as the wire. Calculate the net force acting on the wire. Homework Equations Magnetic Field for...
3. Another Electric Potential Problem

Homework Statement A charge of 2.9*10^-6C is held fixed at the origin. A second charge of 2.9*10^-6 C is released from rest at the position (1.15m, 0.550m). And the mass of the second charge is 2.10 g. At what distance from the origin does the 2.9*10^-6 charge attain half the speed it will...
4. Find the change in electric potential

Homework Statement I'm having trouble understand why I'm getting the following question wrong: a uniform electric field of magnitude of 6.0*10^5 N/C points in the positive x direction. Part A) Find the change in electric potential between the origin and the point (0, 6.0m) . Homework...
5. Find the charge's location

Homework Statement The electric field at the point x=5.0cm and y=0 points in the positive x direction with a magnitude of 10.0N/C. At the point x=10.0cm and y=0, the electric field points in the positive x direction with a magnitude of 16.0 N/C. Assume this electric field is produced by a...
6. Electric field charges

Homework Statement The figure shows a system consisting of three charges, q1=+5.0uC, q2=+5.0uC and q3=-5.0uC, at the vertices of an equilateral triangle (with q2 at the top point of the triangle). Find the magnitude of the electric field at a point halfway between the charges q1 and q2...
7. What is the heat added to this monatomic ideal gas

Homework Statement A monatomic ideal gas expands at a pressure of 110kPa and from a volume of 0.75m^3 to 0.93m^3. Find the amount of heat added to the gas. Homework Equations So what I did was: W= P∆V and I know ∆U= Q-W so Q would equal ∆U+W, but how do you know what ∆U equals...
8. Equilibrium Temperature

Homework Statement A 150g aluminum cylinder is removed from a liquid nitrogen bath, where it has been cooled to -196 degrees C. The cylinder is immediately placed in an insulated cup containing 60.0g of water at 15.0 degrees C. What is the equilibrium temperature of the system? Homework...
9. Thermal Expansion (again)

Homework Statement A hole in an aluminum plate has a diameter of 1.179 cm at 22.00 degrees Celsius. Part A asks for the diameter of the hole at 199 degrees Celsius.? Part B asks for the temperature of the hole when its diameter is 1.177 cm? Homework Equations ∆L = alpha L(0) ∆T...
10. Thermal Expansion of a steel plate

Homework Statement A steel plate has a circular hole with a diameter of 1.000 cm. In order to drop a Pyrex glass marble 1.003 cm in diameter through the hole in the plate, how much must the temperature of the system be raised? (Assume the plate and the marble always have the same temperature)...
11. Deriving an equation

Homework Statement Using equations #1 and #2 to derive equation #3 Homework Equations #1- ∆x = (b/2)theta #2- ∆z= L (2theta) #3- ∆x= ∆z b/4L The Attempt at a Solution Now I set equations #1 and #2 equal to each other, but I'm not sure how the thetas end up cancelling or if I'm even...
12. Tangential and Centripetal Acceleration

Hi, I basically just have a concept question, if the tangential acceleration of an object is zero, can at the same time its centripetal acceleration be nonzero?
13. Finding Acceleration of gull

Homework Statement A glaucous-winged gull, ascending straight upward at 5.10 m/s drops a shell when it is 11.5m above the ground. What is the magnitude of the shell's acceleration just after it is released? Homework Equations The only equation that I can think of would be v^2= v(i) + 2a...