In a rectangular coordinate system, a positive point charge q =
3.00 nC is placed at the point x= 0.190 m , y=0, and an identical
point charge is placed at x= -0.190 m , y=0. Find the x and y
components and the magnitude and direction of the electric field at
the following points. Part F Find the x and y components of the
electric field at x= 0.190 m , y= -0.350 m

1) In a racetrack, cars are expected to be moving with a speed
of approximately 120m/s. If the turns in the track are quarter
circles with radius 150m, at what angle should the tracks be banked
so that the cars can make the turn without using friction? 2) A 1000kg train engine is pulling a 5000kg boxcar. In this
boxcar is a 100kg crate of apples. The train is accelerating at
2m/s². Draw a complete freebody diagram of each object (the engine,
the car, and the crate). The friction between the boxcar and the
tracks is negligible, but other frictions are not. Find the values
of each force, and indicate which pairs of force are
action/reaction pairs. 3) A box is sitting on the side of a hill that makes an angle
20° with the horizontal. There is a horizontal wind blowing the box
up the hill. If the box has a mass of 30kg, and the coefficient of
kinetic friction between the box and the mountain is 0.1, how
strong is the force from the wind?

Two moles of carbon monoxide (CO) start at a pressure of 1.1 atm
and a volume of 54 liters. The gas is then compressed adiabatically
to 1/3 this volume. Assume that the gas may be treated as ideal.
What is the change in the internal energy of the gas?

Approximate a fishing reel to be two solid disks, each of radius 6.1 cm and combined mass 0.85 kg which can rotate without friction. String (of negligible mass) is wrapped around the reel (between the disks) all the way to its edge (see Fig 1a). The fishing line is strung with bait and left at rest in the water. A fish then suddenly takes the bait and applies a constant force of 1.7 N on the fishing line, pulling the reel counterclockwise. (a) What is the angular acceleration of the fishing reel? alpha = rad/s^2 (b) Immediately after taking the bait, how much fishing line does the fish pull from the reel in 0.31 s? (Assume this time interval is short enough that radius of the fishing line wrapped around the reel does not appreciably change during it.) line pulled off = cm (c) Suppose instead this fisherman had cast his bait much further out, so that the fishing line left on the reel was only halfway out to the edge (see Fig 1b). If all other givens are the same, re-answer parts a & b. alpha = rad/s^2 line pulled off = cm

The electric potential in a region of space is V = 300V. m/Squareroot x^2 + y^2, where x and y are in meters. What is the strength of the electric field at (x, y) = (2.5m, 1.4m)? Express your answer using two significant figures. What is the direction of the electric field at (x, y) = (2.5m, 1.4m)? Give the direction as an angle ccw from the positive a-axis. Express your answer using two significant figures.

We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of the Not yet answered +10 mu c at the center of the s Through a hole in the surface Find the electric field present at a point 10 cm from sphere’s center. a. 9.0 times 10^6 N/C b. 36 times 10^6 N/C c. 1.1 times 10^6 N/C d. 2.3 times 10^6 N/C

Calculate the pH of a solution prepared by dissolving 0.150 mol
of acetic acid and 0.300 mol of sodium acetate in water sufficient
to yield 1.00 L of solution. The Ka of acetic acid is 1.76
x10^-5.

Bar AB rotates uniformly about the fixed pin A with a constant angular velocity omega. Determine the velocity and acceleration of block C, at the instant theta = 30 degree.

A circuit is connected as shown in the figure. Note that the negative terminal of the power supply is grounded (the potential = 0 V at this point). (a) Find the current through the point a. Show all your work and explain your reasoning. Find the current through the point b in the circuit. (c) Find the potential at the point a in the circuit. Explain your calculation.

A negatively charged particle,
-q, is placed at the center of a uniformly charged ring with a
positive charge Q and radius R as shown in the figure. The particle
is confined to move along the x axis and displaced a small distance
from the center of the ring (x<< f=(1/2pi)(k qQ/mR )