A ball is dropped from rest from the top of a
building of height h. At
the same instant, a second ball is projected vertically upward from
ground level, such that it has zero speed when it reaches the top
of the building.
a) When do the two balls pass each other?
Answer it in terms of h.
b)Which ball has greater speed when they are
passing?
c)What is the height of the two balls when they
are passing?
The elevator starts from rest at the first floor of the building
and comes to a complete stop at the 6th floor. It can accelerate at
6 ft/s2 and then decelerate at 2 ft/s2
Determine the shortest time is takes to reach the 6th floor, which
is 60 ft above the ground. Draw the v?t and s?t graphs for the
motion of the elevator.
A brick falls from rest from the roof of a tall building. Two
seconds later a ball is thrown vertically downward with a velocity
of 75m/s how far below the roof does the ball hit the brick?
Ironman steps from the top of a tall building. He falls freely
from rest to the ground a distance of h. He falls a distance of h/
4 in the last interval of time of 1.0 s of his fall.
Hint: First, compute the velocity when Ironman
reaches the height equal to the distance fallen. This requires that
you do the following: define origin as the bottom of the building.
Then use x-x0 = -v0*(t-t0)-(1/2)g(t-t0)^2 where x=0 and x0=
(distance...
A 300-g ball is dropped at rest from a height 3.0 m above the
horizontal floor. The ball bounces off the floor with an initial
speed of 2.0 m/s. If the ball is in contact with the floor for 150
ms, what is the magnitude of the average force on the ball
associated with the impact
A 5.00 kg lead sphere is dropped from the top of a 60.0-m-tall
building.
Part A
If all of its kinetic energy is converted into heat when it hits
the sidewalk, how much will its temperature rise? (Ignore air
resistance.)
Express your answer in degrees celsius to three significant
figures.
ΔT
ΔT
=
∘C
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A 2 kg stone is dropped from a 50-m-tall building.
Simultaneously, a second 1 kg stone is thrown horizontally from the
building at a speed of 15 m/s, as shown in the figure.
Calculate the x position of the center of mass of the
two-stone system the moment after they are set in motion.
Calculate the y position of the center of mass of the
two-stone system the moment after they are set in motion.
Calculate the x position of...
you jump from a 20 meter tall building to a 12 meter tall
building you jump horozontally with a speed of 5.0 m/s.
all must be answered using ther following equations v =
dx/dt; a = dv/dt; v =
v0 + at; x = x0 +
vot +
at2/2; v2 =
vo2 + 2aD
how long in seconds are you in the air?
how far apart are the two buildings assuming you jumped from the
edge and landed on the edge?
what is your...
A stone is dropped from rest into a well. The sound of the
splash is heard exactly 1.60 s later. Find the depth of the well if
the air temperature is 12.0°C. in m
A rock is dropped from the top of a tall tower. Half a second
later another rock, twice as massive as the first, is dropped.
Ignoring air resistance,
they strike the ground with the same kinetic energy
they strike the ground more than half a second apart.
the distance between the rocks increases while both are
falling.
the acceleration is greater for the more massive rock.