Answer:
Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living things. All known cellular life and some viruses contain DNA. The main role of DNA in the cell is the long-term storage of information.
link: https://www.sciencedaily.com/terms/dna.htm
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The answer on the question given is letter B.Momentum is a vector quantity and kinetic energy is a scalar quantity.
Answer: Double-decker buses have heavy weights attached to their undersides. b The crane has a heavy concrete block attached to one end of its arm, ant others placed around its base.
Answer:
320m/s
Explanation:
Step 1: State your values
s= NOT NEEDED
u=20m/s
v=?
a=10m/s²
t=30 seconds
Step 2: Find a suitable suvat equation:
v=u+at
Step 3:
subsitute values into equation:
?=20+(10x30)
20+300
320m/s
Incomplete question.The complete question is
A 0.27 kg rock is projected from the edge of the top of a building with an initial velocity of 11.7 m/s at an angle 58 above the horizontal.
Due to gravity, the rock strikes the ground at a horizontal distance of 15.9 m from the base of the building. How tall is the building? Assume the ground is level and that the side of the building is vertical. The acceleration of gravity is 9.8 m/s
Answer:
Total height of the building =6.78 m
Explanation:
v = 11.7 m/s
Horizontal component of velocity = v x cos 58 = 11.7*cos 58 = 6.2 m/s
Total time of flight = Horizontal distance / Horizontal component of velocity = 15.9 / 6.2 = 2.56 sec.
Vertical component of velocity = v x sin 58 = 11.7 x sin 58 = 9.92 m/s
Time taken to reach maximum height = Vertical component of velocity / g = 9.92 / 9.81 = 1.01 sec.
Hence, Time taken to reach ground from maximum height = 2.56 - 1.01 = 1.55 sec.
Hence, Maximum height from ground = 0.5 x g x t^2 = 0.5 x 9.81 x 1.55^2 = 11.78 m
Maximum height from the top of building = 0.5 x 9.81 x 1.01^2 = 5 m
Hence, Total height of the building = 11.78 m - 5 m = 6.78 m
