Question

A 0.240 g pebble is fired horizontally at a speed of 18.0 m/s from the top of a 38.5 m tall building. Ignoring air resistance, find the momentum when the pebble reaches a height of 25.0 m.

Answer #1

A 0.240 g pebble is fired at a speed of 14.6 m/s from the top of
a 20.0 m tall building. Ignoring air resistance, find the kinetic
energy with which the pebble strikes the ground when the pebble is
fired vertically straight up.
A ball which is thrown straight up takes 3.50 s to reach the
maximum height. Determine the gravitational potential energy of the
ball (m = 0.145 kg) when it reaches the maximum height.

A marble is thrown horizontally with a speed of 22.1 m/s from
the top of a building. When it strikes the ground, the marble has a
velocity that makes an angle of 46 ° with the horizontal. From what
height above the ground was the marble thrown?

A man throws a ball straight upward with speed 30 m/s from the
top of a building that is 75 m high. Ignore air resistance and
choose the vertical y-axis to be positive downward with
origin at the point of throw (top of the building).
Represent the initial velocity and the acceleration vectors in
the reference y-axis above.
Find the maximum height the ball reaches with respect to the
ground.
How long does it take the ball to reach the...

A ball is thrown horizontally with an initial speed of 50m/s
from the top of a building 60m tall
a) How far away from the building will the ball hit the
ground?
b) What is the horizontal component of its velocity when it hits
the ground?
c) Find the magnitude and direction of the velocity when it hits
the ground?

A boy uses a slingshot to launch a pebble straight up into the
air. The pebble reaches a height of 38.0 m above the launch point
1.0 seconds later. Assume air resistance is negligible.
(a) What was the pebble's initial speed (just after leaving the
slingshot)?
42.9 m/s
(b) How much time did it take for the pebble to first reach a
height of 19.0 m above its launch point?
? s
You toss a tennis ball straight upward. At...

Consider a pebble of mass m=34 g launched from initial height
h=7.1 m with speed v=5.1 m/s at angle θ=42 degrees above the
horizontal. Just before the pebble lands on the ground is has a
speed v=10.2 m/s. What is the work done on the pebble an external
force (wind? air drag?) Provide your answer in joules, use three
significant figures.

A rock is thrown downward with a speed of 10.7 m/s from the top
of a cliff which height is 234 m. What was the time for the rock to
reach the bottom of the cliff? (g = 9.59 m/s2 and assume air
resistance is negligible)

rock thrown upward with an initial speed of 24.5 m/s
from the top of a 50m tower.
a. what's the rockets velocity the instant it hits the
ground?
b. how long is it in the air?
c. what's the max height above the building the ball
reaches?

A 6.03-g bullet is fired horizontally at a speed of 662 m/s
directly toward a 3.89-kg wooden block. The wooden block is sliding
on a frictionless surface and is moving toward the bullet at a
speed of 2.68 m/s. The bullet passes through the block and the
block's speed is reduced to 1.98 m/s. With what speed does the
bullet emerge from the other side of the block?

A physics book slides off a horizontal table top with a speed of
1.15 m/s. It strikes the floor in 0.500 s. Ignore air resistance.
(Assume the book's horizontal direction and upward are
positive.)
(a) Find the height of the table top above the floor.
m
(b) Find the horizontal distance from the edge of the table to the
point where the book strikes the floor.
m
(c) Find the horizontal and vertical components of the book's
velocity just before...

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