For lunch, you and your friends decide to stop at the nearest deli and have a sandwich made fresh for you with 0.103 kg of turkey. The slices of turkey are weighed on a plate of mass 0.430 kg and placed atop a vertical spring of negligible mass, with a force constant of k = 170 N/m. The slices of turkey are dropped on the plate all at the same time from a height of 0.310 m. They make a totally inelastic collision with the plate and set the scale into vertical simple harmonic motion (SHM). You may assume that the collision time is extremely small. Once the turkey is on the plate, the scale oscillates around a new equilibrium position. a. How far from the new equilibrium position was the plate when the slices of turkey landed on it? b. Find the velocity of the turkey immediately after the collision.

Problem 21: A uniform stationary ladder of length L = 3.7 m and mass M = 19 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. The coefficient of static friction between floor and ladder is μ = 0.44. The ladder makes an angle θ = 56° with respect to the floor. A painter of mass 8M stands on the ladder a distance d from its base.

Part (a) Find the magnitude of the normal force N, in newtons, exerted by the floor on the ladder. Numeric : A numeric value is expected and not an expression. N = __________________________________________

Part (b) Find an expression for the magnitude of the normal force NW exerted by the wall on the ladder. MultipleChoice: 1) NW = ½Mg cot? 2) NW = 1/2Mg cot? (1+16d/L) 3) NW = 1/2Mg cot? (16d/L) 4) NW = 1/2Mg tan? (1+16d/L) 5) NW = Mg cot? (16+d/2L)

Part (c) What is the largest distance up the ladder dmax, in meters, that the painter can stand without the ladder slipping? Numeric : A numeric value is expected and not an expression. dmax = __________________________________________

A parallel-plate capacitor has capacitance C0 = 7.80 pF when there is air between the plates. The separation between the plates is 1.80 mm.

1- What is the maximum magnitude of charge that can be placed on each plate if the electric field in the region between the plates is not to exceed 3.00×10⁴ V/mV/m?

Express your answer with the appropriate units.

2- A dielectric with KKK = 2.40 is inserted between the plates of the capacitor, completely filling the volume between the plates. Now what is the maximum magnitude of charge on each plate if the electric field between the plates is not to exceed 3.00×10⁴ V/mV/m?

Express your answer with the appropriate units.

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 300 N applied to its edge causes the wheel to have an angular acceleration of 0.894 rad/s².

(a) What is the moment of inertia of the wheel?



(b) What is the mass of the wheel?


(c) If the wheel starts from rest, what is its angular velocity after 4.90 s have elapsed, assuming the force is acting during that time?

I'm working on a post against a recent creationism article about blue stragglers. From when I was in undergrad, the general explanation was that they were likely second generation stars within globular clusters. More recent work seems to indicate that it's likely due to binary interactions with a sun-like star siphoning material off a companion to become a recent and short-lived blue supergiant.

Since this is way outside my field, I thought I'd try my luck here and get a bronze badge because I've never asked a question. What are the most accepted theories these days for this phenomenon?

You walk into a room and notice that there someone is running an experiment involving a spring-mass system. You have no idea when the experiment started, but observe that the mass attached to the spring is oscillating with period 3 (seconds) and that the amplitude of the oscillations remain constant (to your naked eye) while you are in the room. What are two differential equations which model the motion of the mass? One system must be inhomogeneous and the other must be homogeneous. Do not worry about the initial conditions.

Type into Google: "globalfoundries sand to silicon", and a Youtube video will come up (accessed on 3/17/2020). The address is:

youtube.com/watch?v=UvluuAIiA50

Watch more than once if needed.

The video will go over various parts of the process steps in making a silicon computer chip integrated circuit (IC). On this page (and on the back if needed):

1. List (in order) the major steps in the fabrication process described in the video set. I do not expect you to have a detailed description of each step – just write down the "highlights".

2. Explain why the ICs are fabricated in the "clean rooms" depicted in the video.

3. A representation of the silicon crystal is used in some of the animations in the video. Explain what is wrong with the representation.

If it has enough kinetic energy, a molecule at the surface of the Earth can escape the Earth’s gravitation.

The acceleration of gravity is 9.8 m/s2, and the Boltzmanns’ constant is 1.38066 × 10−23 J/K.

minimum kinetic energy needed to escape in terms of the mass of the molecule m, the free-fall acceleration at the surface g, and the radius of the Earth R.

1. Kmin = 1 m g R 3

2. Kmin = 1mgR 2

3. Kmin = 2 m g R 1

4. Kmin = √2 m g R 5. Kmin = m g R

020 (part 2 of 2) 10.0 points

Calculate the temperature for which the min- imum escape energy is 5 times the average kinetic energy of an oxygen molecule.

Answer in units of K.

Using energy conservation, determine the minimum kinetic energy needed to escape in terms of the mass of the molecule m, the free-fall acceleration at the surface g, and the radius of the Earth R.

1. Kmin = 1 m g R 3

2. Kmin = 1mgR 2

3. Kmin = 2 m g R 1

4. Kmin = √2 m g R 5. Kmin = m g R

020 (part 2 of 2) 10.0 points

Calculate the temperature for which the min- imum escape energy is 5 times the average kinetic energy of an oxygen molecule.

Answer in units of K.

1. Please use the equations to support your answers. What and why is the main energy consumption difference for the car driving in city or highway?

2. What is the principle for the flying and how to drive an airplane with high-energy efficiency ? Please use the equations to support your answers.

1) A cart with mass m₁ = 3.2 kg and initial velocity of v_1,i = 2.1 m/s collides with another cart of mass M₂ = 4.3 kg which is initially at rest in the lab frame. The collision is completely elastic, and the wheels on the carts can be treated as massless and frictionless. What is the velocity of m₁ in the center of mass frame after the collision?

v_f^* =

2) A block of mass M₁ = 3.5 kg moves with velocity v₁ = 6.3 m/s on a frictionless surface. It collides with block of mass M₂ = 1.7 kg which is initially stationary. The blocks stick together and encounter a rough surface. The blocks eventually come to a stop after traveling a distance d = 1.85 m . What is the coefficient of kinetic friction on the rough surface?

μ_k =

What was the value of Energyout from the Earth's surface during the Faint Young Sun era? Give your answer in W/m2, but don't write the W/m2 part.

An electric dipole is formed from 1.2 nC charges spaced 2.4 mm apart. The dipole is at the origin, oriented along the y-axis. What is the electric field strength at the following points?

(a) (x, y) = (10 cm, 0 cm)

______N/C

(b) (x, y) = (0 cm, 10 cm)

_____N/C

A m₁ = 1.00-kg aluminum block and a m₂ = 6.10-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 34.5°) as shown in the figure. (For aluminum on steel, μ_s = 0.61 and μ_k = 0.47. For copper on steel, μ_s = 0.53 and μ_k = 0.36.) (a) the acceleration of the two blocks and (b) the tension in the string