# Search results

1. ### Finding mixture concentration using Beer's Law

Homework Statement A 0.0450 M solution of para-aminobenzoic acid had an absorbance of 0.844 at 267 nm in a 1.00 cm cuvet, and an absorbance of 0.034 at 240 nm. A 0.0366 M solution of nicotinic acid had absorbances of 0.010 and 0.755 at 267 and 240 nm, respectively. A MIXTURE of PABA and...
2. ### Curly Electric Fields

Homework Statement The magnetic field is uniform and out of the page inside a circle of radius R, and is essentially zero outside the circular region (see the figure). The magnitude of the magnetic field is changing with time; as a function of time the magnitude of the magnetic field is...
3. ### A neutral metal rod in a uniform magnetic field

Homework Statement A neutral metal rod of length 0.35 m slides horizontally at a constant speed of 9 m/s on frictionless insulating rails through a region of uniform magnetic field of magnitude 0.6 tesla, directed into the page as shown in the diagram. Before answering the following...
4. ### Circuits and Loop Rule

Homework Statement Write the loop rule for each of the following circuits: Homework Equations Depending on the loop: -emf + IR1 + IR2 + .... + IRn = 0 V = IR If in series: R1 + R2 + ... Rn = R If in parallel: 1/R1 + 1/R2 + ... 1/Rn = 1/R The Attempt at a Solution I really...
5. ### Electric Field of Single-Battery Circuit with Thin/Thick Wires

Homework Statement The circuit shown above consists of a single battery, whose emf is 1.4 V, and three wires made of the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.4e-6 m2, and is 21 cm long. The thin wire has cross-sectional area...
6. ### Uniformly-charged Thin Rod

Homework Statement If the total charge on a rod of length 0.4 m is 2.6 nC, what is the magnitude of the electric field at a location 1 cm from the midpoint of the rod? Homework Equations [(2QK)/(Y)](1/sqrt(L^2 + 4[(Y)^2]), K = 8.99E9 I don't know if the above equation is actually correct...
7. ### Charged capacitor, electric field

Homework Statement A capacitor consists of two large metal disks of radius 2.4 meters placed parallel to each other, a distance of 0.7 millimeters apart. The capacitor is charged up to have an increasing amount of charge +Q on one disk and -Q on the other. At about what value of Q does a spark...
8. ### Electric Fields and source charge

Homework Statement The source charge (the magenta circle at the origin) is a positive charge. A particle whose charge is -6e-09 C is placed at location D. 1. The electric field at location D has the value < -8000, 8000, 0 > N/C. What is the unit vector in the direction of E at this...
9. ### Electric Dipole Moment and electric field

Homework Statement Two dipoles are oriented as shown in the diagram below. Each dipole consists of two charges +q and -q, held apart by a rod of length s, and the center of each dipole is a distance d from location A. If q = 6 nC, s = 1 mm, and d = 6 cm, what is the electric field at location...
10. ### Rotation with pulleys

Homework Statement A block has a mass of 500 g, another block has a mass of 460 g. Both are attached to a pulley with a frictionless wire that does not slip. The pulley, which is mounted in horizontal frictionless bearings, has a radius of 5.00 cm. When released from rest, the heavier block...
11. ### Completely Inelastic Collisions

Homework Statement A block of mass m1=1.88 kg slides along a frictionless table with a speed of 10.3 m/s. Directly in front of it, and moving in the same direction, is a block m2=4.92 kg moving at 3.27 m/s. A massless spring with a force constant k=1120N/m is attached to the backside of m2...
12. ### Box falling on a spring

Homework Statement A 2.14 kg block is dropped from a height of 43.6 cm onto a spring of force constant 18.6 N/cm. Find the maximum distance the spring will be compressed. I know that the mass is 2.14 kg, the force constant of the spring is K=1860 N/m. I assume the final velocity, the...
13. ### Friction Forces and max braking force

1. The coefficient of static friction between the tires of a car and a dry road is .62. The mass of the car is 1500 kg. What is the maximum braking force is obtainable: a. horizontal to the road. b. on an 8.6 degree downgrade? 2. F=mA f(s)=M(s)N N=mg F=f(s)-mgsin(x) 3. a...