Aspring balance consists of a pan that hangs from a spring. a damping force fd = −bv is applied to the balance so that when an object is placed in the pan it comes to rest in the minimum time without overshoot. determine the required value of b for an object of mass 2.5 kg that extends the spring by 6.0 cm. (assume g = 9.81 m s−2.) 2.

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.

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.

What is an electric motor? explain its operation. 2-3 sentence