Question

Rock thrown off a cliff

You want to know the height of a cliff so you throw a rock off the
edge with an initial speed of 18.5 m/s inclined at an angle 30.3°
above the horizontal. You have a friend that records that it takes
3.4 s for the rock to hit the bottom of the canyon after it is
thrown. For the following questions, call up the positive
*y* direction and make the positive *x* direction
horizontal and towards the direction the rock is thrown.

If you ignore air resistance, what is the *x* component of
the velocity of the rock right before it hits the ground?

Answer #1

A rock is thrown from the edge of a cliff 125m above the ground
with an initial speed of 65.0m/s and at an angle of 37.0 degree
with respect to the horizontal. A). What is the maximum height
above the ground that the rock will reach? B). How long does it
take for the rock to hit the ground? C). How far from the bottom of
the cliff will the rock hit the ground?

A rock is thrown from the edge of a cliff to the ground 19.5 m
below. The rock has an initial velocity of 18.5 m/s, directed 15.0°
above the horizontal.
I answered a and b but need help on C.
(a) How long does it take the rock to reach the ground?
2.5 s
(b) How far from the base of the cliff does the rock strike the
ground?
44.8 m
(c) Find the velocity of the rock just before...

A rock is thrown from the edge of a cliff to the ground 19.5 m
below. The rock has an initial velocity of 18.5 m/s, directed 15.0°
above the horizontal.
(a) How long does it take the rock to reach the ground?
(b) How far from the base of the cliff does the rock strike the
ground?
(c) Find the velocity of the rock just before it strikes the
ground.
magnitude______
direction below the horizontal______

A rock is thrown from the edge of a cliff to the ground 17.0 m
below. The rock has an initial velocity of 20.0 m/s, directed 35.0°
above the horizontal. (a) How long does it take the rock to reach
the ground?
(b) How far from the base of the cliff does the rock strike the
ground?
(c) Find the velocity of the rock just before it strikes the
ground.
magnitude
direction
below the horizontal

A 0.26-kg rock is thrown vertically upward from the top of a
cliff that is 30 m high. When it hits the ground at the base of the
cliff, the rock has a speed of 31 m/s . You may want to review
(Pages 234 - 241) .A 0.26-kg rock is thrown vertically upward from
the top of a cliff that is 30 m high. When it hits the ground at
the base of the cliff, the rock has a...

Consider a rock that is thrown off a bridge of height 82 m at an
angle θ = 22° with respect to the horizontal as shown in
the figure below. If the initial speed the rock is thrown is 13
m/s, find the following quantities.
(a) The time it takes the rock to reach its maximum
height.
s
(b) The maximum height reached by the rock.
m
(c) The time at which the rock lands.
s
(d) The place where...

A rock is launched off a cliff at a speed of 12.1 m/s at an
angle of 35.0 degrees above the horizontal. The height of the cliff
is 16.1 m. How far horizontally from the edge of the cliff does the
rock land (to one decimal place)?
In your solution, also sketch the x-t, y-t, vx-t,
vy-t, ax-t, and ay-t diagrams.

You throw a small rock straight up from the edge of a highway
bridge that crosses a river. The rock passes you on its way down,
6.00 s after it was thrown. After the rock hits the surface of the
water it sinks into the water through a depth of 1.0 meter and
reached a speed of .5 m/s. What is the rate of slowing down for the
rock in the water during this 1 meter travel, assuming it slows...

You throw a small rock straight up from the edge of a highway
bridge that crosses a river. The rock passes you on its way down,
7.00 s s after it was thrown. What is the speed of the rock just
before it reaches the water 22.0 m m below the point where the rock
left your hand? Ignore air resistance.

You are standing on top of a 10-m high cliff. Below you, on the
ground, is a circular target with a radius of 0.5 meters, whose
center is 5 meters from the base of the cliff. On top of the cliff,
and at the edge, is a circular track of radius r. You are going to
drop a 5-kg ball from a height h above the cliff onto the ramp, so
that the ball travels around the track and is...

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