Answer:
15s
Explanation:
Given parameters:
Distance traveled = 375m
Speed = 25m/s
Unknown:
Time taken = ?
Solution:
To solve this problem, we make time the subject of the speed equation.
Speed =
Time =
Now insert the parameters and solve;
Time = = 15s
Answer:
Wavelength = 5.77 * 10^-5 meters.
Explanation:
Given the following data:
Frequency of light = 5.2 *10^12 Hz
We know that the Speed of light = 3.0 * 10^8 m/s
To find the wavelength of light;
Mathematically, wavelength is calculated using this formula;
Substituting into the equation, we have;
Wavelength = 5.77 * 10^-5 meters.
(a)
The angular acceleration can be calculated by using the following equation:
where:
is the final angular speed
is the initial angular speed
is the angular acceleration
is the number of revolutions made by the disk while accelerating
Solving the equation for , we find
(b) 3.23 s
The time needed to complete the 50.0 revolutions can be found by using the equation:
where
is the final angular speed
is the initial angular speed
is the angular acceleration
t is the time
Solving for t, we find
(c) 3.94 s
Assuming the disk always kept the same acceleration, then the time required to reach the 11.0 rev/s angular speed can be found again by using
where
is the final angular speed
is the initial angular speed
is the angular acceleration
t is the time
Solving for t, we find
(d) 21.7 revolutions
The number of revolutions made by the disk to reach the 11.0 rev/s angular speed can be found by using
where:
is the final angular speed
is the initial angular speed
is the angular acceleration
is the number of revolutions made by the disk while accelerating
Solving the equation for , we find