4. What is the period of the microwaves in the above question?
1 answer:
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Complete question:
The 100-kg homogeneous cylindrical disk is at rest when the force F =500N is applied to a cord wrapped around it, causing the disk to roll. Use the principle of work and energy to determine the angular velocity of the disk when it has turned one revolution (radius of the disk = 300mm).
Answer:
The angular velocity of the disk when it has turned one revolution is 16.712 rad/s
Explanation:
From the principle of work and energy;
U = E₂ - E₁, since the disk is initially at rest, T₁ = 0
U = E₂
Work done, U = product of force and perpendicular distance
U = F × d
As the cord winds, force act through the cord at a distance of 2d
U = F × 2d
Distance of one complete revolution = 2πR = 2π(0.3) = 0.6π
U = 500 × 2(0.6π) = 1885.2 J
Kinetic energy E₂
Recall that U = E₂
1885.2 = 6.75ω²
ω² = 1885.2/6.75
ω² = 279.2889
ω = √279.2889
ω = 16.712 rad/s
Therefore, the angular velocity of the disk when it has turned one revolution is 16.712 rad/s
Answer:
the speed that have 0.0100 kilogram bullet with the similar momentum magnitude is 360 m/s
Explanation:
The computation of the speed that have 0.0100 kilogram bullet with the similar momentum magnitude is as follows:
The ball momentum is
As there is a similar momentum
So,
Hence, the speed that have 0.0100 kilogram bullet with the similar momentum magnitude is 360 m/s
Answer:
The correct option is;
c. Temperature and color
Explanation:
Based on Wien's Law which can be presented mathematically as follows;
The wavelength of the peak of the blackbody curve tells the temperature and color.
An example is the Sun that has a temperature of 5800 K, hence the peak wavelength is given by = 500 nano-meter from which the color can be deduced as 500 nano-meter is the wavelength of yellow light.