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
nikitadnepr [17]
3 years ago
12

An electric saw uses a circular spinning blade to slice through wood. When you start the saw, the motor needs 2.00 seconds of co

nstant angular acceleration to bring the blade to its full angular velocity. If you change the blade so that the rotating portion of the saw now has 3.00 times its original rotational mass, how long will the motor need to bring the blade to its full angular velocity
Physics
1 answer:
liberstina [14]3 years ago
7 0

Answer:

6 seconds

Explanation:

So suppose the new saw has the same mass distribution, only difference in mass density, then the moment of the new saw would be 3 times the original ones.

Suppose both saws are under the same torque, by Newton's 2nd law, we have the following equation of angular acceleration related to torque T and moment of inertia I:

\alpha = \frac{T}{I}

So if I is tripled while T stays the same, α would have been reduced 3 times

So to achieve the full angular velocity:

\omega = \alpha t

Now that angular acceleration is reduced 3 times. The time it takes would have to be 3 times as much, or 2 * 3 = 6 seconds.

You might be interested in
Give an example of intense aerobics activity. Prompt must be accurate. ​
Lubov Fominskaja [6]

Answer:

Explanation:

An example of an intense aerobic activity would be running/ sprinting sprinting targets six specific muscle groups: hamstrings, quadriceps, glutes, hips, abdominals and calves. Sprinting is a total body workout featuring short, high-intensity repetitions and long, easy recoveries.

7 0
3 years ago
two forces equal in magnitude and opposite in direction act at the same point on an object. is it possible for there to be a net
elena55 [62]

If the forces are equal, at a distance equidistant it is not possible to act a pair on the body since both torques cancel each other. Being of the same magnitude and in the opposite direction, the sum of the torques will be zero.

5 0
3 years ago
What type of fossils were found near Macon Georgia?
den301095 [7]

Answer:

I believe whale fossils were found.

7 0
3 years ago
Read 2 more answers
In an experiment you measure a first-order red line for Hydrogen at an angle difference of ΔΘ = 22.78o. The diffraction grating
azamat

Answer:

a) wavelength = 656.3 nm

b)  the value of Rydberg's constant for this measurement is 1.097 × 10⁷ m⁻¹

Explanation:

Given that;

angle of diffraction Θₓ = 22.78°

incident angle Θ₁ = 0

slit separation d  = 5900 lines per cm = 1/5900 cm = 10⁻²/5900 m = 0.01/5900 m

order of diffraction n = 1

wavelength λ = ?

to find the wavelength, we use the expression

λ = d (sinΘ₁ + sinΘₓ) / n

To find the wavelength λ;

λ = 0.01/5900 × (sin0 + sin22.78° )

λ = 6.5626 × 10⁻⁷ m

λ = 656.3 x 10⁻⁹ m

∴ λ = 656.3 nm

b)

According Balnur's  series spectral lines; n₁ = 3, n₂ = 2 and

λ = R [ 1/n₂² - 1/n₁²]

where  R is Rydberg's constant

from λ = R [ 1/n₂² - 1/n₁²]

R = 1/λ [n₂²n₁² / n₁² - n₂²]

R = 10⁹/ 656.3 [ 9 × 4 / 9 - 4 ]

R = 1.097 × 10⁷ m⁻¹

Therefore the value of Rydberg's constant for this measurement is 1.097 × 10⁷ m⁻¹

4 0
3 years ago
A water pump with a power of 3.4 × 102 watts lifts water at the rate of 7.5 × 10-2 meters/second from a water tank. What is the
yan [13]
Power = Force x Speed
3.4e2 = F(7.5e-2)
Solving for F
F = 4533.3N
6 0
3 years ago
Other questions:
  • What force must be used to do 224 joules of work on an object over a distance of 32 meters
    7·1 answer
  • Help with these please?
    10·2 answers
  • Using the law of conservation of energy, what will be the KE of an arrow having a PE of 65J after it is shot from a bow?
    6·1 answer
  • Which of the following forms of electromagnetic waves is LEAST dangerous to the human body?
    13·2 answers
  • Choose the correct statement concerning units of power or energy. a. A kilojoule (kJ) is a unit of power. b. A gigawatt (GW) is
    7·1 answer
  • Which month has an average low of 26 degrees Fahrenheit​
    14·1 answer
  • What is the rotation and axis of the lunar eclipse? Pls summarise in detail and asap
    11·1 answer
  • Please help me find the equations guys
    8·1 answer
  • London lives 1200 meters south of Chick-fil-A and is thinking about going there for lunch. When she is ready to leave, she reali
    5·1 answer
  • 7.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!