1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nexus9112 [7]
3 years ago
7

A carnival merry-go-round has a large disk-shaped platform of mass 120kg that can rotate about a center axle. A 60−kg student st

ands at rest at the edge of the platform 4.0m from its center. The platform is also at rest. The student starts running clockwise around the edge of the platform and attains a speed of 2.0m/s relative to the ground. (a) Determine the rotational velocity of the platform. (b) Determine the change of kinetic energy of the system consisting of the platform and the student.
Physics
1 answer:
amid [387]3 years ago
6 0

Answer:

a) The rotational velocity = 0.25rad/s

b) change in KE= 180JOULES

Explanation:

Applying the principles of rotational momentum conservation.

Let m be merry-go-round

s be student

L be the rotational momentum

Li = Lf

Imwf - IsVs/r

Imwf= IsVs/f

1/2 MmWf = 1/2MsVsr

Wf= MsVs/(Mmr)

Wf= 60×2/120×4

Wf= 0.25 rad/s

b)The change in system's KE= Ki - Kf

Change in KE= 1/2[(Im- Is)Wf^2 + MsVs^2 - 0]

Change in KE= 1/2[ 1/2 Mmr^2 + Msr^2)Wf^2 + MsVs^2]

Change in KE= 1/2[(1/2×120×4^2+60×4^2)× 0.25^2 +60×2^2]

CHANGE IN KE = 180 Joules

You might be interested in
What happens to the chemical bonds during energy exchange?
anygoal [31]

In chemical reactions, chemical bonds are broken and reformed, and release their excess bond energy

8 0
3 years ago
Which of the following organs are found in the
Hatshy [7]

Answer:

small intestine, tongue and large intestine

Explanation:

The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.

3 0
3 years ago
when an object is charged by contact, how does the kind of charge transferred compare to that on the object giving the charge?
11111nata11111 [884]

Lets say sphere 1 has a charge of 12 + and sphere 2 has a charge of 0 +. After they are touched Sphere 1 becomes 6 + and sphere 2 6 +. So 6 - 12 = a change of 6 -, while 6 - 0 = a change of 6 + Therfore,

Answer: The sign of the charge change / transfered are opposites.

8 0
3 years ago
How many leptons are in ⁷₃Li?
shutvik [7]

-- Electrons are leptons.  There are <em>three</em> electrons in each neutral Lithium atom.

The last two parts of the question are absurd.

-- Bonbons are candy, not atomic particles.  A bonbon cannot fit into a Lithium atom.

-- A pentagon is a closed geometric figure that has five sides.  Although you could, in principle, have a pentagon small enough to fit into a Lithium atom, you could never find a piece of paper small enough to draw it on.

5 0
3 years ago
How does the kinetic theory explain how you can smell coffee and bacon at thrm?
maksim [4K]
"• Diffusion - coffee and bacon particles are floating around
• They do not interact/blend with each other
• Because of fluidity, the particles are gliding past each other and filling the open space within the nose."
6 0
3 years ago
Other questions:
  • A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. immediately after the impact
    7·2 answers
  • An isometry preserves<br> orientation<br> distance<br> direction
    13·2 answers
  • A force of 18 lb is required to hold a spring stretched 8 in. beyond its natural length. How much work W is done in stretching i
    14·1 answer
  • This procedure has been used to "weigh" astronauts in space:
    7·1 answer
  • A model rocket is fired vertically and ascends with a constant vertical acceleration of 4.00 m/s2 for 5 s. Its fuel is then exha
    6·1 answer
  • A small metal ball is given a negative charge, then brought near to end A of an insulating rod. What happens to end A of the rod
    9·1 answer
  • Table sugar has a chemical composition of c12h22o11. what is the mass of 8.88 moles of sugar
    5·2 answers
  • A laboratory technician drops a 72.0 g sample of unknown solid material, at a temperature of 80.0°C, into a calorimeter. The cal
    7·1 answer
  • Research Galileo’s work on falling bodies. What did he want to demonstrate? What opinions or theories was he trying to refute? W
    5·2 answers
  • If an object is placed between the focal point and twice the focal length of a convex lens, which type of image will be produced
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!