Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
Answer:
11.5
Explanation:
you do 12(sin 73.3) because its on the y you do sin
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Explanation:
Total surface area of cylinder:
sheet of metal required = 120.95 cm^2
Answer:
Average speed = 1.3 m/s
Explanation:
Given that a student walks 160 m in 150 s. The student stops for 30 s and then walka 210 m farther in 140 s.
Neglect the time the student stops.
The total distance covered will be
Distance = 160 + 210
Distance = 370 m
The total time of the whole distance journey will be
Time = 150 + 140 = 290 s
The formula for speed is
Speed = distance/time
Speed = 370/290
Speed = 1.276 m/s
Therefore, the average speed is 1.3 m/s approximately
