<h3>
Answer:</h3>
30.4 km/hr
<h3>
Explanation:</h3>
<u>We are given</u>;
- Speed in the first 2 hours as 25 km/hr
- Speed in the next 3 hours as 34 km/hr
We are required to determine the average velocity in km/hr
- To get the average velocity we divide total distance by total time.
- Thus, we need to determine the total distance
Distance = Speed × time
Distance covered in the first 2 hours;
= 25 km/hr × 2 hours
= 50 km
Distance in the next 3 hours
= 34 km/hr × 3 hours
= 102 km
Therefore, total distance = 50 km + 102 km
= 152 km
Total time = 2 hrs + 3 hrs
= 5 hours
Therefore;
Average speed = 152 km ÷ 5 hours
= 30.4 km/hr
Thus, the average speed is 30.4 km/hr
Answer:
1. Nuclear fusion does not generate radioactive nuclear wastes as nuclear fission does.
2. Nuclear fusion cannot lead to disastrous powerplant explosions as nuclear fission does.
3. More energy is generated during nuclear fusion than in nuclear fission.
Explanation:
Nuclear fusion involves the combination of lighter atoms such as hydrogen to form a heavier nucleus, in the process producing a tremendous amount of energy.
Nuclear fission on the other hand involves splitting a heavy nucleus into two lighter nuclei, releasing energy in the process.
- Nuclear fusion can be more reliable than nuclear fission in energy generation due to the following reasons:
- There are no radioactive waste products obtained as a result of nuclear fusion, unlike nuclear fission. This is because the elements involved in Nuclear fusion are relatively radioactively stable elements.
- The risk of nuclear powerplant explosion due to out of control chain reactions is reduced in nuclear fusion because the reaction can only occur in perfect conditions under high pressure and temperatures <em>(e.g the sun)</em>. When any of these conditions is removed due to a fault, the reaction automatically stops.
- More energy is generated during nuclear fusion than in nuclear fission.
Gravitational potential energy ...
= (mass) x (acceleration of gravity) x (height)
= (20 kg) x (9.8 m/s²) x (30 m)
= (20 x 9.8 x 30) kg-m²/sec²
= 5,880 joules
The chemical symbol for nitrogen is N
