A block of mass m is attached to ideal spring of constant k. When the spring is neither stretched nor compressed, block is at the equilibrium position (x = 0).
Assume the force between the mass and the spring obeys Hooke’s Law: Fs = - kx, where x is the displacement and Fs is the restoring force. The restoring force is always directed toward the equilibrium position. In this example of vibrational motion, the restoring force illustrates Newton's
A) 1st Law of Motion.
B) 2nd Law of Motion.
C) 3rd Law of Motion.
D) Law of Gravitational Attraction.

You have been consulted by the mobile phone company hookup about a new augmented reality product called “brows”. they want to develop an alternative to google glasses, which, you recall, is a proposed new product which plans to superimpose a whole range of wireless google services over the user’s ordinary vision of the world. these appear in little circles and ovals, and let you phone people, take photographs, navigate across cities and inside buildings, find shops and update your social media. brows would do this too, but not be limited to special google services. the user would wear a small cylinder-shaped device designed to fit on top of their existing eyewear (glasses or sunglasses). it would project a reversed image onto the inside of the lenses, the reflection of which would be in focus for the user. instead of voice control, the user would control the device by eye and neck movements, which the device would track. the device would connect via bluetooth to the user’s phone, which would supply most of the computing power and wireless connectivity. hookup also wants to know what existing services would be most in demand, and which would not work well with brows. using your knowledge of augmented reality, wearable technology and interface design, is the project feasible? if not, why not? if feasible, how could the product need to be modified for a better experience?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?