A130 g bullet is fired from a rifle having a barrel 0.560 m long. assuming the origin is placed where the bullet begins to move, the force (in newtons) exerted by the expanding gas on the bullet is 11000 + 13000 x - 28000 x 2, where x is in meters.
a) determine the work done by the gas on the bullet as the bullet travels the length of the barrel.
b) what if? if the barrel is 1.00m long , how much work is done, and how does this value compare with thework calculated in part a)?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Learning goal: to understand newton's 1st law. newton's principia states this first law of motion: an object subject to no net force maintains its state of motion, either at rest or at constant speed in a right line. this law may be restated as follows: if the sum of all forces acting on an object is zero, then the acceleration of that object is zero. mathematically this is just a special case of the 2nd law of motion, f⃗ =ma⃗ , when f⃗ =0. when studying newtonian mechanics, it is best to remember the 1st law in two ways: if the net force (i. e., sum of all forces) acting on an object is zero, the object will keep moving with constant velocity (which may be zero). if an object is moving with constant velocity, that is, with zero acceleration, then the net force acting on that object must be zero. complete the following sentences to see if you can apply these ideas. part a if a car is moving to the left with constant velocity, one can conclude that

Which is not true of alpha radiation? o a. it increases the number of protons. o b. it has a positive charge. o c. it causes transmutation. o d. it is heaviest of the three types