Một vật treo vào lò xo có khối lượng không đáng kể, chiều dài tự nhiên lo độ cứng k, treo thẳng đứng vào vật m1=100g vào lò xo thì chiều dài của nó là 31 cm. Treo thêm vật m2=100g vào lò xo thì cheièu dài của lò xo là 32 cm. Cho g=10m/s^2 độ cứng của lò xo là:

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?

What is the angular momentum of the bar about the axle?

Which situation will produce the greatest change of momentum