Answer:
3.8 secs
Explanation:
Parameters given:
Acceleration due to gravity, g = 9.8 ![m/s^2](https://tex.z-dn.net/?f=m%2Fs%5E2)
Initial velocity, u = 11.76 m/s
Final velocity, v = 49 m/s
Using one of Newton's equations of linear motion, we have that:
![v = u + gt](https://tex.z-dn.net/?f=v%20%3D%20u%20%2B%20gt)
where t = time of flight of arrow
The sign is positive because the arrow is moving downward, in the same direction as gravitational force.
Therefore:
![49 = 11.76 + 9.8*t\\\\\\\49 - 11.76 = 9.8t\\\\=> 9.8t = 37.24\\\\\\t = \frac{37.24}{9.8} \\\\\\t = 3.8 secs](https://tex.z-dn.net/?f=49%20%3D%2011.76%20%2B%209.8%2At%5C%5C%5C%5C%5C%5C%5C49%20-%2011.76%20%3D%209.8t%5C%5C%5C%5C%3D%3E%209.8t%20%3D%2037.24%5C%5C%5C%5C%5C%5Ct%20%3D%20%5Cfrac%7B37.24%7D%7B9.8%7D%20%5C%5C%5C%5C%5C%5Ct%20%3D%203.8%20secs)
The arrow was in flight for 3.8 secs
Solar cells are used to trap sunlight energy (light energy) and convert it to electric energy for domestic and other purposes.
answer:
6 ohms
Explanation:
if these two resistors are connected in series, the total resistance is the sum: 2+4 = 6 (ohms)
Radio waves have longer wavelengths and lower frequencies than microwaves.
infrared is longer wavelengths and lower frequencies than UV light