Explanation:
Given that,
Mass of a skier, m = 55 kg
The vertical distance between start and finish is 10 m.
(a) The potential energy of a skier is given by :
(b) When she reaches the bottom of the hill, the potential energy is converted to kinetic energy. So,
Hence, her potential energy is 5390 J and at the bottom of the hill she is moving with a speed of 14 m/s.
Answer:
The mass number will decrease by eight (8).
Explanation:
Given;
successive beta (b), alpha (a), alpha (a) emissions.
Generally, when a radioactive element emits a beta-particle (b), its mass number doesn't increase but its atomic number increases by 1 .
Also when a radioactive element emits an alpha-particle (a), its mass number decreases by 4, while its atomic number decrease by 2.
For the given question, a successive beta (b), alpha (a), and alpha (a) emissions = (0) + (-4) + (-4) = -8
Thus, when a radioactive element emit a successive beta (b), alpha (a), alpha (a) particles, the mass number will decrease by eight (8).
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Volume of the original block (V) of length (l), width (w) and height (h) is given by the following equation
hence volume of original block, V = (6)(4)(10) =
Now say we cut this block in two equal parts, than the length of new block will be ; where as its width and height will be same as of original block i.e. 4 cm and 10 cm respectively.
So, Volume of half-block is ; or we can say that the volume of half-block is half that of orignal block.