How Kerma and Absorbed dose can be calculated and measured?

Two strings on a musical instrument are tuned to play at 392 Hz(G) and 494 Hz (B).

Part A

What are the frequencies of the first two overtones for G?

Got this, the answer was 784 and 1180

Part B

What are the frequencies of the first two overtones for B?

Need this

Part C

If the two strings have the same length and are under the same tension, what must be the ratio of their masses mGmB?

Got this. It was 1.59

Part D

If the strings, instead, have the same mass per unit length and are under the same tension, what is the ratio of their lengths ℓG/ ℓB?

Need this

Part E

If their masses and lengths are the same, what must be the ratio of the tensions in the two strings?

Need this

I need part B, D, and E

A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 28 ∘ angle. The block's initial speed is 15 m/s . The coefficient of kinetic friction of wood on wood is μk=0.200.

What vertical height does the block reach above its starting point?

What speed does it have when it slides back down to its starting point?

A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha particle doubles.

Both particles are positively charged. The charge and the mass of the proton are, respectively, e andm. The charge and the mass of the alpha particle are, respectively, 2e and 4m.

A- Find the speed of the proton (vf)p by the time the distance between the particles doubles.

Express your answer in terms of some or all of the quantities e, m, r, and ?0.

B- The best way to check whether your result from Part A is correct is to check that it has the correct units. Which of the following expressions, where C stands for coulombs, N for newtons, kg for kilograms, and m for meters, represents the correct SI units for the expression found in part B?

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1,000 m/s2 lasting for at least 1 ms will cause injury. Suppose a small child rolls off a bed that is 0.61 m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.3 mm. If the floor is carpeted, this stopping distance is increased to about 1.2 cm. Calculate the magnitude and duration of the deceleration in both cases, to determine the risk of injury. Assume the child remains horizontal during the fall to the floor. Note that a more complicated fall could result in a head velocity greater or less than the speed you calculate.

(a) How would you place two electrons on a sphere of radius R so that the electrostatic potential energy is minimized. How would you place three electrons to solve the same problem.

(b) Explain in physical terms how a microwave oven works. What would happen when you put a conductor in the microwave oven? Explain.

During an earthquake, a floor oscillates horizontally in approximately simple harmonic motion. Assume it oscillates at a single frequency with a period of 0.67 s.

(a) After the earthquake, you are in charge of examining the video of the floor motion and discover that a box on the floor started to slip when the amplitude reached 11 cm. From your data, determine the coefficient of static friction between the box and the floor.

______________

(b) If the coefficient of friction between the box and floor were 0.39, what would be the maximum amplitude of vibration before the box would slip?

_______________cm

An insulated beaker with negligible mass contains liquid water with a mass of 0.285 kg and a temperature of 73.2 ∘C .

How much ice at a temperature of -13.0 ∘C must be dropped into the water so that the final temperature of the system will be 39.0 ∘C ?

Take the specific heat of liquid water to be 4190 J/kg⋅K , the specific heat of ice to be 2100 J/kg⋅K, and the heat of fusion for water to be 3.34×10⁵ J/kg .

1) Explain the difference between static charge detectors and EMF detectors

2) Show the equivalent input circuit for the FET detector and the arduino detector. Determine the current levels needed for detection (lighting the LED or showing a bar on the bargraph)

List and discuss the two major factors involved in the dispersion or broadening in the propagation of optical pulses over long distances. This should be related to fiber optic communications.

Suppose a rocket ship accelerates upwards with acceleration equal in magnitude to twice the magnitude of g (we say that the rocket ship accelerations upwards at 2g), but runs out of fuel after 100 seconds, after which point it stops accelerating upward. At this point, the rocket begins accelerating downwards with a magnitude of g. Assume that the gravitational pull of the Earth on the rocket doesn't change with altitude.

a)How high above the surface of the Earth does the rocket travel before it stops accelerating?

b) How fast is the rocket going when it stops accelerating?

c) How high does the rocket get before it begins to fall back to Earth?

d) How long after launch does the rocket strike the Earth again?

e) What is the average velocity of the rocket between when it leaves the Earth and when it strikes the Earth again?

Suppose the origin of the world coordinate system is at the pinhole. Let the z-axis be along the optical axis of the camera (perpendicular to the image plane), and the x and y axes are parallel to the image plane. Let the distance of the image plane from the pinhole be f. Now, consider a point in the scene moving with velocity (u, v, w) from the starting point (x0, y0, z0). Write the equation for the image coordinates (p, q) at time t. Show that the image point moves along a straight line as t increases.

A planar slab of thickness of 6.00 cm has a uniform volume charge density of 4.20×10-2 C/ m3. Find the magnitude of the electric field at all points in space both inside and outside the slab, in terms of x, the distance measured from the central plane of the slab. What is the field for x = 12.00 cm?

An antelope and a cheetah decide to race to a watering hole 1 km
away. The cheetah's top speed is 3x the top speed of the antelope, so the cheetah is condent
she's got the win in the bag. From the starting line, the animals accelerate uniformly to
their top speeds in 10 seconds. After 30 more seconds, the exhausted cheetah stops for a
rest. The antelope is nowhere in the cheetah's sight, so the cheetah decides to take a quick
2-minute nap. Upon waking, the cheetah again accelerates uniformly to her top speed in 10
seconds and crosses the finish line at that speed. If the antelope crosses the finish line in 3
minutes and 10 seconds, who wins the race? Draw a velocity vs time graph for the cheetah's
motion.