Tres participantes en un concurso de TV están colocados en el centro de un campo plano grande. A cada uno se le proporciona una regla

graduada de un metro, un compás, una calculadora, una pala

y (en diferente orden para cada concursante) los siguientes tres desplazamientos:

A: 72.4 m, 32.0° al este del norte

B: 57.3 m, 36.0° al sur del oeste

C: 17.8 m al sur

Los tres desplazamientos llevan al punto donde están enterradas las

llaves de un Porsche nuevo. Dos concursantes comienzan a medir de inmediato; sin embargo, el ganador calcula

primero a donde debe ir. Con tres cifras

significativas exprese la resultante.

Which describe reflection? check all that apply. light bounces off a boundary.

The ballistic pendulum was invented in 1742 by english mathematician benjamin robins. it consists of an initially stationary pendulum that moves after being struck by a bullet, and it is used to measure the original velocity of the bullet. the known variables are the bullet's mass m, the pendulum's mass m, and the height to which the block and bullet swing, determined by the length of the pendulum l and final angle θ. two principles of physics are necessary to solve for the bullet's original velocity. what are these principles? conservation of momentum and newton's third law conservation of energy and conservation of angular momentum grade summary deductions 0% potential 100% conservation of momentum and newton's second law. newton's second law and conservation of angular momentum. conservation of energy and newton's third law conservation of momentum and conservation of angular momentum. conservation of momentum and conservation of energy conservation of energy and newton's second law.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.