Two observers o and o' observe two events a and b. the observers have a constant relative speed of 0.8c. in units such that the speed of light is 1, observer o obtained the following coordinates: event a: x 3,y 3, z 3,1 3 event b: x 5,y 3, 1,15 a) find the length of the space-time interval between these two events, as measured by b) are a and b causally connected? if so why? what is the time difference between a and b as observed in o"?

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

where is the photo and the answer choices?

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.