Question

Two rocks are thrown simultaneously from the top of a very tall tower with identical speeds of v = 7.90 m/s, but in two different directions. (See figure.) One of them is thrown with an angle of 10.0 degrees below the horizontal, the other one at an angle of 50.0 degrees above the horizontal. How far will the rocks be from each other after 4.90 s? (Neglect air resistance and assume that the rocks will not hit the ground.)

Answer #1

Two rocks are thrown from the top of a very tall tower. One of
them is thrown vertically up with an initial velocity of vup = 15.4
m/s. The other rock is thrown horizontally to the right with an
initial velocity of vright = 11.5 m/s. (See figure.) How far will
the rocks be from each other after 4.08 s? (Neglect air resistance
and assume that the rocks will not hit the ground or the
tower.)

Two golf balls are thrown simultaneously with the same initial
speed from the edge of a cliff. One ball is thrown at an angle of
30° above the horizontal; the other is thrown horizontally. Neglect
air resistance and rotation of the golf balls. Which statement
below is correct? The golf balls strike the ground at the same time
and with equal speeds. The golf balls strike the ground at the same
time with different speeds. The golf balls strike the...

1. Two identical eggs were thrown at the same time from the top
of a building of height 100 m at a speed 20. One egg was thrown at
an angle 40° above the horizontal while another was thrown at the
same angle but below the horizontal. How long does it take for the
other egg to hit the ground after the one of the eggs hits the
ground?
Does the time difference between the eggs hitting the ground
depend...

A 4.1-kg ball is thrown from the top of a 4-m tall building
(point A) with a speed of 1 m/s at an angle 2 degrees above the
horizontal. If air resistance is negligible, what is the value of
the kinetic energy of the ball as it hits the ground?

A person throws two identical stones from the top of a 200-m
high cliff overlooking a lake. Stone 1 is thrown at an angle of
30o above the horizontal with an initial speed of 40
m/s. Stone 2 is thrown at an angle of 30o below the
horizontal with an initial speed of 40 m/s. Neglect air
resistance.
Which stone hits the water first?
Stone 1.
They hit at the same time.
Stone 2.
Which stone strikes the water with...

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 projectile is thrown from the top of a building of height 43.0
m with an initial velocity 16.0 m/s along a direction that makes
that makes an angle of 34.0 degrees above the horizontal.
(1) When does the projectile reach maximum height
(2) When does the projectile first reach a height of 45.0 m
above the ground
(3) When does the projectile hit the ground and how far from the
building

A stone thrown from the top of the building is given an initial
velocity of 8 m/s at an angle of 20.0o below horizontal. It strikes
the ground 3.00 s later. (a) How far horizontally from the base of
the building does the stone strike the ground? (b) Find the height
from which the stone is thrown? (c) How long does it take the ball
to reach a point 10.0 m below the level of launching? (d) What are
the...

Two
identical pellet guns are fired simultaneously from the edge of a
cliff. These guns impart an initial speed of 30 m/s to each pellet.
Gun A is fired straight upward with the pellet eventually hitting
the ground beneath the cliff. Gun b is fired straight downward.
Ignore air resistance. Assume g=10 m/s/s.
A. How long after pellet B hits the ground does pellet A
hit.
B. If the pellet hits the ground with an impact speed of 60
m/s,...

2. (15pts, 5pts
each) A ball is thrown from the top of a building that is
H = 40 m height. It has an initial velocity
v0 that is at angle
of = 53° below the horizontal direction, as shown in the
below Figure. The ball hits the ground t = 2.0 s after being
thrown. You may neglect air resistance.
a) Find the magnitude of the initial velocity
v0 of the ball.
b) Find the velocity of the ball just...

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