It's easier for you to solve these than to try and read my solutions if I solve them.
Use this magic formula:
(period) · (frequency) = 1
If you handle the magic formula carefully and correctly, you can get these facts out of it:
-- Period = 1 / frequency
-- Frequency = 1 / period
Use the first one to solve #1.
Use the second one to solve #2.
Answer:
1.75g
Explanation:
Given parameters:
Density = 3.5g/cm³
Volume = 0.5cm³
Unknown:
Mass of the diamond = ?
Solution:
Density is the mass per unit volume of a substance
Density =
So;
Mass = 3.5 x 0.5 = 1.75g
Answer:
Its velocity is 0.29 m/s due east.
Explanation:
The bunny rabbit covered a total distance of 6 m eastwards during the motion in 21 seconds.
Velocity is define as the ratio of the displacement (distance moved in a specified direction) to the time taken.
velocity = 
It is a vector quantity, and measured in meters per seconds.
From the given question, displacement = 6 m due east and time = 21 seconds. So that;
velocity = 
= 0.2857
The velocity of the rabbit is approximately 0.29 m/s due east.