A platinum wire that is 1.20 m long has a radius of 0.500 mm and is fixed at both ends. It's frequency is 512Hz and it has a wavelength of 2/3 its length. The density of platinum is 21.4 x 10³ kg/m3. What is the tension in the wire?

hw 2 Laser beams are sometimes used to burn away cancerous tissue. What is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a 2.1-mm diameter spot of cancerous tissue and must deposit 515 J of energy to it in a time period of 4.05 s?

a solar panel is a square 0.5m on a side and absorbs all the light that hits it. It the panel has a mass of 3 kg. what intensity of light would be necessary to hold it up against the force of gravity (its own weight)? how much bigger is this than the solar constant (1400 W/m^2)?

At a distance of 39 ft , an ionizing radiation source delivers 7.0 rem of radiation. How close can you get to the source without having any biological effects? The intensity of the radiation increases as you move closer to the radiation source according to the equation I1 / I2 =D22/D12

Betelgeuse, a red-giant star in the constellation Orion, has a peak in its radiation at a frequency of 3.09 X 10^14 Hz. What is the surface temperature of Betelgeuse?

We used an experimental setup like the one shown below. The length of the string between the string vibrator and the pulley is L = 2.00 m. The mass per unit length or linear density of the string is μ = 0.0005 kg/m. The string vibrator can oscillate at any frequency. The hanging mass is 511 g. Frictionless pulley String vibrator μl= dm dx The wavelength of the fifth mode (n = 5) is m. The frequency of the fifth mode (n = 5) is Hz. The tension in the string is close to When the mode of vibration is increased to n = 10, the wave speed of the string will → 2 The wave speed on the string is m/s. N. constant Drag answer here Drag answer here Drag answer here Drag answer here Drag answer here m Hanging mass 500 125 remain the same 0.8 100 2.0 increase

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Optical tweezers use light from a laser to move single atoms and molecules around. Suppose the intensity of light from the tweezers is 1000 W/m², the same as the intensity of sunlight at the surface of the Earth. (a) What is the pressure on an atom if light from the tweezers is totally absorbed? Pa (b) If this pressure were exerted on a helium atom, what would be its acceleration? (The mass of a helium atom is 6.65 x 10-27 kg. Assume the cross-sectional area of the laser beam is 6.65 x 10-29 m².) m/s²

A spacecraft approaching a star at 4.00 E 7 m/s fires a laser at a stationary target. The beam of light has an apparent frequency of 5.04 E 16 hz. What is the wavelength of the light beam that hits the target?  a 1.26 E 9 m  b 5.95 E −9 m  c 7.94 E −10 m  d 8.24 E −9 m

You and your friend Bruce are experimenting with a red lamp shade and blue lamp shade. You place lamp shades individually over a 120-W light bulb. Assume that the light radiates from the lamps uniformly and 9.5% of their power is converted to light. (a) What is the average intensity of the light at 1.6 m from the red (1 = 710 nm) lamp shade? W/m2 (b) Is the average intensity of the blue (1 = 480 nm) lamp shade at 1.8 m greater than, less than, or equal to the intensity calculated in part (a)? greater than less than O equal to