A proton enters a vertical magnetic girlf of magnitude 0.0500 T and travels east. what is the direction of the magnetic force on the proton?

A parallel plate capacitor has an area of A=200 cm^-2    and 0.50 cm plate distance. The capacitor is firstly connected to a power supply that has potential difference V0=30V    and after charged the power supply is disconnected. After then a sheet of insulating plastic material is inserted between the plates (completely filling the space between them). With the plastic material the potential difference decreases to 10 V while the charge on capacitor remains the constant. Find ;
a) the original (while filled air) capacitance C0 .

b) the stored charge Q

c) the capacitance C after the dielectric is inserted.

d) the dielectric constant of the dielectric.

e) the original electric field E0 between the plates.

f) The stored energy at the original capacitor.

A capacitor is connected to a battery and placed in a magnetic field (-z direction) to form a velocity selector. A charge moving at 3,479.6 m/s is not deflected by the velocity selector. If the voltage of the battery is 7 volts and the distance between the sheets is 0.3 meters, what is the amount of the magnetic field in milli-Tesla?

The vector position of a 3.90 g particle moving in the xy plane varies in time according to r with arrow1 = 3i + 3j t + 2jt2 where t is in seconds and r with arrow is in centimeters. At the same time, the vector position of a 5.60 g particle varies as r with arrow2 = 3i − 2it2 − 6jt.

A person with mass mp = 78 kg stands on a spinning platform disk with a radius of R = 2.37 m and mass md = 198 kg. The disk is initially spinning at ω = 1.4 rad/s. The person then walks 2/3 of the way toward the center of the disk (ending 0.79 m from the center).

1)What is the total moment of inertia of the system about the center of the disk when the person stands on the rim of the disk?

2)What is the total moment of inertia of the system about the center of the disk when the person stands at the final location 2/3 of the way toward the center of the disk?

3)What is the final angular velocity of the disk?

4)What is the change in the total kinetic energy of the person and disk? (A positive value means the energy increased.)

5)What is the centripetal acceleration of the person when she is at R/3?

6)If the person now walks back to the rim of the disk, what is the final angular speed of the disk?

Consider two photons, one with energy 1 = 2 MeV traveling to the right, and the other with energy 2 = 3 MeV moving to the left. The two photons collide head-on and produce a positron-electron pair. In this problem you will calculate the velocities of the two particles after the collision. Use the Doppler Shift equation to find the velocity of a frame of reference S' such that the two photons have the same energy. Which direct is S

LASER IN DERMATOLOGY write effect,application,advantage and disadvantages of laser in dermatology and Referances

A projectile is launched with an initial speed of 45.0 m/s at an angle of 40.0° above the horizontal. The projectile lands on a hillside 3.25 s later. Neglect air friction. (Assume that the +x-axis is to the right and the +y-axis is up along the page.)

(a) What is the projectile's velocity at the highest point of its trajectory?

(b) What is the straight-line distance from where the projectile was launched to where it hits its target?
?  m

Explain the difference between Fero and Paramagnatism

Why are light bulbs in New Year's Christmas trees usually switched on sequentially?

CH 9 ITEM 11

A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10 cm. A 1.70 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the system is released from rest.

Part A

How far must the stone fall so that the pulley has 3.00 J of kinetic energy?

Part B

What percent of the total kinetic energy does the pulley have?

Do standing waves explain why electron orbitals are quantized?

Consider an RLC circuit that is driven by an AC source with an adjustable frequency. Is possible for the maximum voltage drop across the capacitor to exceed the maximum voltage? Explain in 100 words or less.

I know the answer is yes, but can you explain this conceptually, not mathmatically? thanks.