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.

A circular coil of 144 turns has a radius of 1.54 cm. (a) Calculate the current that results in a magnetic dipole moment of magnitude 2.13 A

A ball is hit east from a 10 meter elevated platform with an initial velocity of <50, 0, 30> m/s. A wind blowing to the south produces an acceleration on the ball of -1.2 m/s^2.

a. Find the velocity and position vectors for t ≥0.

b. Determine the time of flight and range of the ball.

c. Determine the maximum height.

d. If you want the ball to land due east of your initial position, determine the correction

angle.

An optical interferometer can detect a displacement of 0.1?, or ?50nm.

At what speed would a 3.0m stick "shrink" by 50 nm? Hint: Use the binomial approximation.