As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. if a iron rod has a resistance of 2.89 ω at 20.0°c, determine the resistance of the rod (in ω) at 120°c by accounting for the changes in both the resistivity and the dimensions of the rod. the coefficient of linear expansion for iron is 4.50 ✕ 10−6 (°c)−1 and the temperature coefficient of resistivity is 4.50 ✕ 10−3 (°c)−1.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

In what direction does an applied force move an object

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.