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
marin [14]
2 years ago
15

Suppose a disk with constant angular velocity has rotational kinetic energy 1280 J. If the moment of inertia of the disk is 35 k

g-m^2, then what is its angular velocity? (a) 7.604 rad/s (b) 8.552 rad/s (c) 10.12 rad/s (d) 6.818 rad/s (e) 9.952 rad/s (f) 8.935 rad/s f
Physics
1 answer:
lozanna [386]2 years ago
8 0

Answer:

Angular velocity of the disk is 8.552 rad/s

Explanation:

It is given that,

Rotational kinetic energy, KE = 1280 J

The moment of inertia of the disk, I = 35 kg m²

We have to find the angular velocity of the disk. In rotational mechanics the kinetic energy of the disk is given by :

KE=\dfrac{1}{2}I\omega^2

\omega=\sqrt{\dfrac{2KE}{I}}

\omega=\sqrt{\dfrac{2\times 1280\ J}{35\ kgm^2}}

\omega=8.552\ rad/s

Hence, the angular velocity of the disk is 8.552 rad/s.

You might be interested in
ear the end of a marathon race, the first two runners are separated by a distance of 45.0 m. The front runner has a velocity of
sesenic [268]

Answer:

a) V_{2/1}=0.8m/s

b) The second runner will win

c) d = 10.54m

Explanation:

For part (a):

V_{2/1} = V_{2} - V_{1} = 0.8m/s

For part (b) we will calculate the amount of time that takes both runners to cross the finish line:

t_{1} = \frac{X_{1}}{V_{1}}=\frac{250}{3.45}=72.46s

t_{2} = \frac{X_{2}}{V_{2}}=\frac{250+45}{4.25}=69.41s

Since it takes less time to the second runner to cross the finish line, we can say the she won the race.

For part (c), we know how much time it takes the second runner to win, so we just need the position of the first runner in that moment:

X1 = V1*t2 = 239.46m  Since the finish line was 250m away:

d = 250m - 239.46m = 10.54m

6 0
3 years ago
Read 2 more answers
When you throw a ball upward, its kinetic energy and its potential energy . When the ball reaches maximum height, its kinetic en
emmasim [6.3K]
It has zero kinetic energy, more potential energy
8 0
3 years ago
Read 2 more answers
Which is true of electricity generated both from coal and from nuclear reactions?
aleksklad [387]
They both release greenhouse gases, I think
8 0
3 years ago
Read 2 more answers
. Boa constrictor snakes have tiny pelvic girdles and leg bones within their bodies. Since these structures are not functional,
blondinia [14]

Those organic structures that do not seem to play any important biological function in the organism that possesses them are known as vestigial structures.

<h2>What is a vestigial structure?</h2>

A vestigial structure is one that has atrophied or lost its original function throughout the course of evolution.

  • It generally refers to those organic structures that were useful at some point, but are now practically or totally useless.

  • These structures are preserved as an inheritance of the evolutionary process, because at some point an ancestor of the current species had that structure, which was functional, but it ceased to be important and would end up atrophy.

Therefore, we can conclude that vestigial structures are structures that some organisms still conserve as an inheritance from their ancestors but that, for some reason or another, are no longer useful for the functioning of the same.

Learn more about vestigial structures here: brainly.com/question/2141655

4 0
2 years ago
The hairdryer has a plastic case so there is no need for an earth wire connection in the plug.
kolbaska11 [484]
Gravitational attraction / field strength increases when closer; A light dependent resistor (LDR) can be used as a sensor to detect light intensity.
4 0
3 years ago
Other questions:
  • Which of the following is true about this lever?
    7·2 answers
  • One mole of water is equivalent to 18 grams of water. A glass of water has a mass of 200 g. How many moles of water is this?
    7·2 answers
  • An electroscope is a fork-shaped device commonly used to detect the presence of charge. The tin leaves of an electroscope will s
    6·1 answer
  • I will Mark Brainliest 1. ) Allena and Charissa were discussing whether Cl2 is an element or a compound. Allena said that it is
    13·1 answer
  • How much is the tension number 2
    11·1 answer
  • On March 21, a stick casts the following shadow. What is the most likely time of day?
    10·2 answers
  • Please help San Jose to San Francisco is approximately 7200 meters away. If it takes you 3600 seconds to drive by car what is th
    14·2 answers
  • You throw a football straight up. Air resistance can be neglected. When the football is 4.00 mm above where it left your hand, i
    14·1 answer
  • A 63.3 kg wood board is resting on very smooth ice in the middle of a frozen lake. A 35.7 kg boy stands at one end of the board.
    6·1 answer
  • An aluminium object has a mass of 27kg and density of 2700 the object is atached to a spring and immerged in a tank of water det
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!