Provide TWO specific strategies that an equipment designer could employ to reduce heating of

the temperature-sensitive components and explain how physics concepts are applied in each

strategy.

A textbook of mass 2.08 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.160 m , to a hanging book with mass 3.10 kg . The system is released from rest, and the books are observed to move a distance 1.30 m over a time interval of 0.770 s . What is the moment of inertia of the pulley about its rotation axis?

Naive reasoning suggests that a string theory vacuum with cosmological constant Lambda1 is always unstable as long as there is a string theory vacuum with cosmological constant Lambda2 < Lambda1 since the later is a state with lower energy density. If it's true, there should be very few stable vacua since these would be the vacua with the lowest possible cosmological constant. These vacua would probably have a Planckian-size cosmological constant and therefore be highly non-classical.

However, I suspect there is something wrong with this line of reasoning. Probably I am thoroughly confused about something.

Also, how to compare stability of vacua with different number of large dimensions? Comparing cosmological constants doesn't feel to make sense.

Use the Conservation of Angular Momentum to explain why a tail rotor is necessary to stabilize the flight of a helicopter.

Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (2.1 m) from an SR-71 Blackbird airplane flying at an altitude of 23 km. (Assume light with a wavelength of 470 nm.)

1. What is the magnitude of the average gravitational force between the Sun and Mercury?
2. What is the magnitude of the average gravitational force between the Sun and Mercury if the orbital radius of Mercury was doubled?

(you will have to look up Newton's Universal Law of Gravitation and some values of mass and distance) and please list them with the solution.

Please answer in scientific notation and round to three significant figures.

Who pushed the Montreal Protocol on Substance that Deplete the Ozone into prominence?

During which phase(s) of the Moon is it possible to observe the Moon rising after Sunset but before Midnight

The point charges in the figure below have the following values: q₁ = +2.8

Jason takes off across level water on his jet ski. The combined mass of Jason and the ski is 80.0Kg. The ski has a thrust of 250.0N and a coefficient of kinetic friction with the water of 0.100. If Jason forgot to check his gas tank and runs out of fuel in 90.0s : a) what is his acceleration during the first 90 sec? b) what is his maximum speed? c) how far did he travel before he ran out of fuel? d) What is his acceleration after he runs out of fuel?

describe magnetic inductance and give examples.

describe R-L, L-C, and L-R-C series circuits, and give examples.

not by hand please and type it by the keyboard.

do not copy others work from chegg.

Thanks

The figure shows two masses connected by a cord passing over a pulley of radius R₀ and moment of inertia I. Mass M₁slides on a frictionless surface, and M₂ hangs freely.

(a) Determine a formula for the angular momentum of the system about the pulley axis, as a function of the speed v of mass M₁ or M₂. (Use R0 for R₀, M1 for M₁, M2 for M₂, I,v and g for gravity, as necessary.)

(b) Determine a formula for the acceleration of the masses.

a ball is thrown vertically upward with a speed of 25m/s, a) how high does it rise. B) how long does it take to reach its highest point? C) how lnong does the ball take to hit the ground after it reachest highest point? D) what is the velocity when its returned to the level from which it started?

For point charge -9.6 µC and point charge 5.3 µC located at the same positions as in the previous question (5 m and 4 m, respectively), determine the direction of the net electric field E at the origin. 1µC = 10-6C Your answer should be an integer, do not include the unit.