Two objects, O1 and O2, have charges +3.0μC and −5.0μC, respectively, and a third object, O3, is electrically neutral.

Part A:

What is the electric flux through the surface A1 that encloses all three objects?

Part B:

What is the electric flux through the surface A2 that encloses the third object only?

"The CMB represents the heat left over from the Big Bang. It is the oldest electromagnetic radiation in the universe."

Why "heat"? Isn't very cold?

What is the connection between the blackbody and the CMB.

I would like to have a simple explanation for the CMB, with your own words. Please. :-)

Thanks

A test charge of +3.00 μC is placed halfway between a charge of +8.00 μC and another of +5.00 μC separated by 10.00 cm. (a) What is the magnitude of the force on the test charge? (b) What is the direction of this force (away from or toward the +8.00 μC charge)?

A plane with a speed of 800.0 km/hr due east passes directly above a train traveling due southeast at 100.0 km/hr on a straight level road. The altitude of the aircraft is 10.0 km. How fast is the distance between the plane and the train increasing 45 s after the aircraft passes directly above the train?

The loaded cab of an elevator has a mass of 3.6 × 10³ kg and moves 216 m up the shaft in 17 s at constant speed. At what average rate does the force from the cable do work on the cab?

What range of velocities might an electron have if it is confined to a 0.4-nm-wide region? And if it is confined to about the size of an atom (0.1-nm-wide region)? Compare this to your previous knowledge about the speed of electrons in the atom. What does this mean?

A 10 cm long thin glass rod uniformly charged to +10 nC and a 10 cm long thin plastic rod uniformly charged to -10nC are placed side by side 4 cm apart.

a. Find the electric field at distances 1.0 cm, 2.0 cm and 3.0 cm from the glass rod along the line connecting the midpoints of the two rods. (Hint: treat the rods as a uniform line of charges.)

b. If the plastic rod is exchanged for a glass rod of the same size uniformly charged to +10 nC, what is the new electric field at 1.0 cm, 2.0 cm and 3.0 cm?

Blue light of wavelength 470 nm passes through an interference grating with a slit spacing of0.001 mm and makes an interference pattern on the wall.

How many bright fringes will be seen?

A solid cylinder with a mass of 3 kg, a radius of 25 cm, and a length of 40 cm is rolling across a horizontal floor with a linear speed of 12 m/s. The cylinder then comes to a ramp, and, as it is rolling up this ramp without slipping, it is slowing down. When the cylinder finally comes to a stop and begins rolling back down the ramp, how high is it above the floor?

1. How can contrast be achieved in a display using texture? Color? Line? Give an example of each

2. Describe the concept of proportion, and explain why it is important to any visual presentation

A meteor with a mass of 1 kg moving at 20 km/s collides with Jupiter's atmosphere. The meteor penetrates 100 km into the atmosphere and disintegrates. What is the average force on the meteor once it enters Jupiter's atmosphere (Ignore gravity).

*The answer is 2 x 10^3 N but I have no idea why.

What is the escape speed on a spherical asteroid whose radius is 700 km and whose gravitational acceleration at the surface is 0.685 m/s2? (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 694 m/s? (c) With what speed will an object hit the asteroid if it is dropped from 1066 km above the surface? (SHOW ALL WORK)

Q.6 (same as problem 3) The phenomenon that distinguishes transverse waves from longitudinal waves is

A. Frequency

B. Amplitude

C. Polarization

D. Speed

Two very long solenoids have the same number of turns per unit length, and carry the same current, but the radius of the cross-section of solenoid #1 is twice that of solenoid #2. How do the magnetic field fluxes through the solenoids compare?

Select the best answer.

Select the best answer.

Problem 9.41

A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 20 m/s . The third piece has twice the mass as the other two.

Part A

What is the speed of the third piece?

Express your answer using two significant figures.

Part B

What is the direction of the third piece? Give the direction as an angle east of north.

Express your answer using two significant figures.