Why is it that not all bodies possess Elastic behavior? What is the origin of elasticity or plasticity? I mean, it's a physical property. So, how does it relate to atoms or molecules in different phases? (It should have some relation with atoms)

A diver springs upward from a board that is 2.70 m above the water. At the instant she contacts the water her speed is 11.7 m/s and her body makes an angle of 64.4 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and (b) direction.

An iron wire has a cross-sectional area of 5.90 ✕ 10⁻⁶ m². Carry out steps (a) through (e) to compute the drift speed of the conduction electrons in the wire.

(a) How many kilograms are there in 1 mole of iron?
_____________ kg/mol

(b) Starting with the density of iron and the result of part (a), compute the molar density of iron (the number of moles of iron per cubic meter).
___________mol/m³

(c) Calculate the number density of iron atoms using Avogadro's number.
__________ atoms/m³

(d) Obtain the number density of conduction electrons given that there are two conduction electrons per iron atom.
___________electrons/m³

(e) If the wire carries a current of 38.0 A, calculate the drift speed of conduction electrons.
___________ m/s

A star has strong molecular lines in its spectrum. What is its spectral class? O B A F G K M

What is its approximate temperature? ________ K

How can l write a lab report on the specific latent heat of ice?(electric method)

You cannot make the earth's magnetic field disappear, so while performing magnetic field mappings can the earth's field impact my results? if any at all?
In Mapping magnetic fields where are they the strongest and weakest?

1)The speed of light in a certain substance is 77.28-% of its value in crown glass. What is the index of refraction of that substance?

2)The speed of light in a certain substance is 81.7-% of its value in water. What is the index of refraction of that substance?

3)What is the speed of light in (km/s) in a material that has an index of refraction of 3.59?

At our distance from the Sun, the intensity of solar radiation is 1370 W/m^2. As discussed in class and in the textbook, the temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the effect of absorption of infrared radiation by the surface so as to make the surface temperature of the Earth higher than if it were airless. The average global surface temperature of the Earth is ~288 K. Calculate the surface temperature of the Earth if it did not have an atmosphere. You may assume an emissivity of 1. The radius of the Earth is 6370 km and its distance from the Sun is 1.496 × 10^11 m.

Why can or cannot perfectly elastic collisions ever occur in nature??

1. The second order fringe when 700 nm light falls on a double slit is
observed at a 15° angle to the initial beam direction. How far apart are
the slits? Ans: 5.41 x 10^-6 m

2. Light of frequency 6 x 10^14 Hz falls on a pair of slits that are 0.0002 cm
apart. The center of the slits is 50 cm from the screen. How far from the
central bright line will the first order line appear? Ans: 0.13 m

3. Monochromatic light falling on two slits 0.026 mm apart produces the
fourth-order line at a 6.4°angle. What is the wavelength of light used?
Ans: 7.25 x 10^-7 m

4. Light of wavelength 6.5 x 10^-5 cm passes through a single slit and falls on
a screen 100 cm away. The third-order dark band is 0.25 cm from the
center of the pattern. What is the slit width? Ans: 7.8 x 10^- 4 m

5. A diffraction grating with 760 lines per cm is used to form a diffraction
pattern. The first-order line is 3 cm from the central bright spot. The screen
is 80 cm away. What is the wavelength of light used? Ans: 4.93 x 10^-7 m

6. At what angle will 710 nm light produce a third order maximum when
falling on a grating whose slits are 0.0017 cm apart? Ans: 7.2°

A billiard ball is shot east at 2.80 m/s. A second, identical billiard ball is shot west at 1.20 m/s. The balls has a glancing collision, not a head-on-collision, deflecting the second ball by 90° and sending it north at 1.55 m/s. What is the angle that the velocity of the first ball makes after the collision, with respect to the east direction?

A box of mass ?=20.5 kg is pulled up a ramp that is inclined at an angle ?=19.0∘ angle with respect to the horizontal. The coefficient of kinetic friction between the box and the ramp is ?k=0.305 , and the rope pulling the box is parallel to the ramp. If the box accelerates up the ramp at a rate of ?=2.89 m/s2 , calculate the tension ?T in the rope. Use ?=9.81 m/s2 for the acceleration due to gravity.

An electron of kinetic en-
ergy 1.20 keV circles in a plane per-
pendicular to a uniform magnetic
field. The orbit radius is 32.7 cm. Find
(a) the electron’s speed, (b) the magnetic field magnitude, (c) the circling frequency, and (d) the period of the motion.

For problem 28.21 calculate the cyclotron period in nanoseconds using a cyclotron radius of 32.7 cm. 5 sig. figs.

2. Critique the following carbon mitigation wedge plan from the perspective of developing nations. Is this friendly to the growth of these nations? Make sure you completely dissect the plan with respect to cost, energy needs, and threat of famine. Your critique should be 100-words or less.