A block of metal which is 20 cm on a side has a mass of 20 kg. What is it’s density? Please answer in MkS (SI) units.
1 answer:
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Answer:
a) System aceleration:
b) Direction of movement:
The block down the plane when the acceleration is negative. This occur when:
The block up the plane when the acceleration is positive. This occur when:
Explanation:
For the block the move direction is parallel (||) to the plane
(1)
For the block the move direction is vertical (y)
(2)
Both blocks are connected with the same cable, therefore, the tension on the cable and the acceleration is the same for both.
Solving the equation 2 for T:
(3)
replacing (3) in the equation (1)
(4)
solving (4) for a:
mass number is defined as sum of number of protons and neutrons
so here for Isotope A
Isotope A contains 56 protons and 80 neutrons.
Mass number will be given as
For Isotope B
Isotope B contains 55 protons and 81 neutrons.
For Isotope C
Isotope C contains 57 protons and 80 neutrons.
For Isotope D
Isotope D contains 56 protons and 74 neutrons.
<em>So here Isotope A and Isotope B has same mass number</em>