Answer:
0J
Explanation:
The gravitational potential energy of the body is 0J because the height is at 0m.
Gravitational potential energy is a form of energy which is highly dependent on the position of a body. The relative position of a body in space accounts for the amount of gravitational potential energy they posses.
- A body at height 0m has no gravitational potential energy:
Gravitational potential energy = mgh
m is the mass of the body
g is the acceleration due to gravity
h is the height
So, if h = 0, Gravitational potential energy will become 0.
Answer:
100 m/s
Explanation:
Let find the velocity components first
Fx = 100 * cos (37) = 79.86 m/s
Fy = 100 * sin (37) = 60.18 m/s
applying motion equations
assuming no acceleration in horizontal direction we can assure that the ending velocity component will still remain Fx = 79.86 m/s
- Vertical motion (upwards)
V² = U² +2as
= 60.18² + 2*(-10)*0
Fy = 60.18 m/s
Total speed = √(F²x+F²y) = 100 m /s
*** You can take the same answer considering the Energy
Answer:
(a) 2 (b) 4 (c) 4
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
- Digits from 1 to 9 are always significant and have infinite number of significant figures.
- All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
- All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
- All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
- All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
- All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.
As per question,
0.000054 has 2 significant figures.
3.001 x 10⁵ has 4 significant figures.
5.600 has 4 significant figures.
That would be a decomposer
Hope this helps!
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