Usted ha sido contratado como un testigo experto por un abogado para un juicio que involucró un accidente de tráfico. El cliente del abogado, el demandante en este caso viajaba hacia el este hacia una intersección a 13.0 m/s como se mide justo antes del accidente por un medidor de velocidad de carretera, y como lo ve un testigo digno de confianza. Cuando el demandante entró en la intersección, su auto fue golpeado por un conductor en dirección norte, el acusado en este caso conducía un auto con masa idéntica a la del demandante. Los vehículos pegados juntos después de la colisión y la izquierda paralela dejaron marcas de la patinada en un ángulo de =60° al norte del este, medido por investigadores de accidentes. El acusado afirma que él viajaba dentro del límite de velocidad de 35 mi/h. a) Argumente el principio físico empleado para definir la velocidad inicial de los dos automóviles. Explique de lo general a lo particular empleando todos los datos para definir el proceso de solución.

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?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?