The ball moves by uniformly accelerated motion, and its vertical position at time t is described by the following law
where
is the initial height from which the ball starts its motion
is the initial velocity of the ball
is the gravitational acceleration
The time in which the ball reaches the ground is the time t at which the vertical position y(t) becomes zero:
Which means
whose solutions are:
Neglecting the negative solution (since it has no physical meaning), we can say that the ball reaches the ground after 1.10 s.
Answer:
Part a)
f = 1911.5 Hz
Part b)
Explanation:
Here the source and observer both are moving towards each other
so we know that the apparent frequency is given as
here we know that
now we will have
Part b)
Apparent wavelength is given by the formula
here we will have
C. Science is objective, and pseudoscience is subjective
Well we know the correct answer cannot be "a" bcause velocity is tangent to the circlular path of an object experienting centripical motion. Velocity DOES NOT point inward in centripical motion.
we know the correct answer cannot be "b" because "t" stands for "time" which cannot point in any direction. so, time cannot point toward the center of a circle and therefore this answer must be incorrect.
I would choose answer choice "c" because both force and centripical acceleration point toward the center of the circle.
I do not think answer choice "d" can be correct because the velocity of the mass moves tangent to the circle. velocity = (change in position) / time. Therefore, by definition the mass is moving in the direction of the velocity which does not point to the center of the circle.
does this make sense? any questions?