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liq [111]
3 years ago
15

A uniform disk, such as a record turntable, turns at 5.0 rev/s around a frictionless spindle. A nonrotating rod, of the same mas

s as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk. They then both turn around the spindle with their centers superposed. What is the angular velocity in rev/s of the combination?
Physics
1 answer:
gogolik [260]3 years ago
5 0

Answer:

w=3rev/s

Explanation:

The motion has two steps so is going to be before and after analysis

Before:

L=I*w

L=\frac{1}{2}*m*R^2*w

L=\frac{1}{2}*m*R^2*\pi *f

After:

L'=\frac{1}{2}*m*R^2*w+\frac{1}{12}*m*R^2*w

m*R^2w'*(\frac{1}{2}+\frac{1}{3})

\frac{5}{6}*m*R^2*\pi*f'

Angular momentum is conserved

L=L'

L=\frac{1}{2}*m*R^2*\pi *f=\frac{5}{6}*m*R^2*2*\pi *f'

f'=\frac{6}{10}*5rev/s

w=3rev/s

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Answer:

When the volume increases or when the temperature decreases

Explanation:

The ideal gas equation states that:

pV= nRT

where

p is the gas pressure

V is the volume

n is the number of moles of gas

R is the gas constant

T is the gas temperature

Assuming that we have a fixed amount of gas, so n is constant, we can rewrite the equation as

\frac{pV}{T}=const.

which means the following:

- Pressure is inversely proportional to the volume: this means that the pressure decreases when the volume increases

- Pressure is directly proportional to the temperature: this means that the pressure decreases when the temperature decreases

8 0
4 years ago
Both speed and velocity measure how fast something is moving. However, since speed is not a _________ it does not require a(n) _
Jet001 [13]

Both speed and velocity measure how fast something is moving. Hence, since speed is not a vector it does not require direction.

Speed only depends on the distance covered by the object and how much time it took to cover that distance. It does not care about the direction, it just depend on the length of the entire path covered. Whereas, velocity depends on magnitude as well as the direction of the object's motion for example: When an airplane is traveling, It is better to deal the motion with velocity and when we are moving in a car inside the city, we should deal the motion with speed.  

3 0
4 years ago
The earth rotates about its pole once every 24 hrs. The distance from the pole to a location on the Earth is 35* north latitude
Oksana_A [137]
The angular velocity, ω= 
2π/t; t = 24 hrs = 24 x 3600 seconds = 86400 s
ω = 7.27 x 10⁻⁵
v = ωr
= 7.27 x 10⁻⁵ x 3242.8 x 1.6 x 1000 (converting miles to meters)
= 377.2 m/s
4 0
3 years ago
What is the speed of a cyclist that rides west 88 km in 32 minutes?
suter [353]

Answer:

The speed of the cyclist is 2.75 km/min.

Explanation:

Given

  • The distance d = 88 km
  • Time t = 32 minutes

To determine

We need to find the speed of a cyclist.

In order to determine the speed of a cyclist, all we need to do is to divide the distance covered by a cyclist by the time taken to cover the distance.

Using the formula involving speed, time, and distance

s=\frac{d}{t}

where

  • s = speed
  • d = distance covered
  • t = time taken

substitute d = 88, and t = 32 in the formula

s=\frac{d}{t}

s=\frac{88}{32}

Cancel the common factor 8

s=\frac{11}{4}

s=2.75 km/min

Therefore, the speed of the cyclist is 2.75 km/min.

8 0
3 years ago
A force that pushes or pulls is known as
xeze [42]

Answer:

A force that pushes or pulls is known as Newton's third law of Motion.

Explanation:

Newton's Third Law of Motion. Newton's Third Law of Motion states that for each action, there's an equal and opposite reaction. What this suggests is that pushing on an object causes that object to keep off against you, the precise same amount, but within the other way.

7 0
3 years ago
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