The photograph shows an experimental device at sandia national laboratories in new mexico. this device is a mirror that focuses sunlight to heat sodium to a boil, which then heats helium gas in an engine. the engine does the work of driving a generator to produce electricity. the sodium unit and the engine are labeled in the photo. (a) what kind of mirror, concave or convex, is being used? (b) where is the sodium unit located relative to the mirror? express your answer in terms of the focal length of the mirror.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you

Sasha has just gotten a new job in a nearby city. after comparison shopping, she found that renting a nice two-bedroom apartment would cost around $800 per month. her utilities would cost about $150 per month. sasha has enough money saved for a down payment, and she found that she can buy a three-bedroom house or condo with a mortgage payment of $1,000 per month, including taxes and homeowner's insurance. her utilities would cost about $200 per month. what is the advantage of buying the house over renting the apartment?