Agymnast with mass m1 = 43 kg is on a balance beam that sits on (but is not attached to) two supports. the beam has a mass m2 = 115 kg and length l = 5 m. each support is 1/3 of the way from each end. initially the gymnast stands at the left end of the beam.
1)what is the force the left support exerts on the beam?
2)what is the force the right support exerts on the beam?
3)how much extra mass could the gymnast hold before the beam begins to tip?
now the gymnast (not holding any additional mass) walks directly above the right support.

4)what is the force the left support exerts on the beam?
5)what is the force the right support exerts on the beam?

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

Asemipermeable membrane is placed between the following solutions. which solution will decrease in volume? solution a: 1.4% (m/v) starch solution b: 7.62% (m/v) starch

You are in a car that is traveling along highway 99 at a constant speed of 16 m/s. suddenly you see a truck also traveling at a constant speed (3.0 m/s) that is on a track to cross your lane from an alley on the right and is moving into your lane (which you can’t get out of, because of broader safety concerns like head on traffic in the other lane). your car’s maximum acceleration is 6.0 m/s2 (either way, gettingfaster or slower) and your reaction time of 0.75 s between first seeing the truck and applying the brake or the accelerator. the distance from the side street, where you first notice the truck, to the right edge of your lane is 2.0 m and the lane also has a fixed width of 4.0m, check for yourself that all these numbers are reasonable. you will assume a reasonable size for your car. the truck is 3.0 m wide.a) how long will it take the truck from the moment you notice it, to block enough of your lane so you can’t slip past while also staying in your own lane (in seconds)? b) how far will your car travel (in meters) while your brain is figuring out what to do? c) if you decide that braking is in your best interests how long will it take you to come to a complete stop once you begin the process of braking (in s)? d) what is the minimum distance (in m) you must be from the truck to successfully stop before hitting