Two cars collide head-on. At every moment during the collision, the magnitude of
ID: 1487763 • Letter: T
Question
Two cars collide head-on. At every moment during the collision, the magnitude of the following Newton's first law; Newtons second law; Newtons third law; New ton s law of gravitation. From the same height (and at the same time), one ball is dropped and another ball is fired hen ' mutually. Which one w ill hit the ground first? The "dropped" ball The "fired" ball They both hit at the same time It depends on the initial height Which of the following gives the magnitude of the acceleration of a uniform circular motion? Which of the following represents the work done by a constant force F during a displacement rf? (the angle the force makes with the displacement is theta) A race car is moving at a constant speed along a circular race track without slipping, which of the following force is the centripetal force for this uniform circular motion? Which of the following statement about conservation is correct? Kinetic energy conserves in the collision of two bodies. The total linear momentum of the particles in an open system conserves when there is no external force acting on the system. In an isolated system where only conservative forces cause energy changes, the mechanical energy of the system conserves.Explanation / Answer
here,
7.
as the two cars collides
the first car exert force on the seccond is exactly equal to the magnitude of the force the seccond on the first
this is an example of c) Newton's third law , i.e.
For every action, there is an equal and opposite reaction.
8.
when the two balls are dropped from same height
the seccond ball is horizontally fired but both has same vertical speed equal to zero
then both hit the ground c) at the same time
9.
the magnitude of accelration is the centripital accelration ,
a. a = v^2/r
10.
work done , W = force . displacement
W = F.d.cos(theta)
where theta is angle between them
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