Question

A cannonball is sitting (at rest) at the bottom of a cannon, which is pointed at a 45- degree angle. The cannon is fired, and the ball flies up to its maximum height. During this process, who does a greater absolute value of work on the cannonball: the cannon or gravity? (Or are the two numbers the same?) Explain your reasoning.

Answer #1

A 19.0-kg cannonball is fired from a cannon with muzzle speed of
1150 m/s at an angle of 42.0° with the horizontal. A second ball is
fired with the same initial speed at an angle of 90.0°. Let y = 0
at the cannon.
(a) Use the isolated system model to find the maximum height
reached by each ball. hfirst ball =? m
hsecond ball = ? m
(b) Use the isolated system model to find the total mechanical
energy...

A 9.8 kg cannonball was fired from a cannon straight up with an
initial velocity of 42 m/s.
(A) Assuming that all its initial kinetic energy was transformed
into gravitational energy, what is the maximum height that the
cannonball could reach?
(B) Suppose that 20% of its initial kinetic energy was lost due
to friction with the air (air resistance). What is the maximum
height that the cannonball could now reach?
(C) How long will it take, after the cannon...

A cannonball, weighing 19.1 kg, is shot from a cannon sitting on
a ledge a height of 2.50 m above sea-level toward
a castle. It is shot with a velocity of 42.0 m/s at an angle of
55.0° above the horizontal. The cannonball impacts on the
castle wall 5.70 s later.
(a) At what height, in feet, does the cannonball hit the castle
wall?
(b) What is the cannonball’s impact velocity (magnitude and
direction) just before hitting the cliff?
(c)...

King Arthur's knights fire a cannon from the top of the castle
wall. The cannonball is fired at a speed of 58 m/s and an angle of
45°. A cannonball that was accidentally dropped hits the
moat below in 1.97 s.
How far from the castle wall does the cannonball hit the
ground?
What is the ball's maximum height above the ground?

1. a) Mork while driving in his "Eggmobile" on the planet Ork
drives off a cliff 500 m in height. If he was
moving with a horizontal velocity of 100 m/s when
he left the cliff, determine whether or not he will crash into
Mindy who was at the time admiring Ork's landscape at a distance of
1100 m from the foot of the cliff. Show
all calculations !
*NOTE: The gravitational field (acceleration
due to gravity) on Ork is...

1. From the top of a cliff overlooking a lake, a person throws
two stones. The stones have identical initial speeds, but stone 1
is thrown downward at an angle below the horizontal, while stone 2
is thrown upward at the same angle above the horizontal. Neglect
air resistance and decide which stone, if either, strikes the water
with greater velocity (Answer conceptually)
2. A steel ball is dropped onto a very hard floor. Over and over
again, the ball...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

Questions (use complete sentences)
1) What is a conservation law? What is the basic approach taken
when using a conservation law?
2) Could the linear momentum of a turtle be greater than the
linear momentum of a horse? Explain.
3) Carts A and B stick together whenever they collide. The mass
of A is twice that of B. How could you roll the carts so that they
would be stopped after a collision?
4) How can a satellite’s speed decrease...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

Please only answer the first question!
The OECD is a club of the most advanced economic nations in the
world – based on living standards and per capita income more than
absolute size. Newer members include Turkey, Mexico and Hungary.
China and India are not yet members despite their vast populations.
Currently the OECD has 32 members.
The 2009 OECD Employment Outlook discusses prospects for
unemployment and possible policy responses. The evolution of
unemployment depends on (a) the size of...

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