27% helium and 71% hydrogen
<u>Answer:</u>
First plane is 1819.58 miles is far from second plane after 2. hours.
<u>Explanation:</u>
Let east represents positive x- axis and north represent positive y - axis. Horizontal component is i and vertical component is j.
Velocity of the first plane is 670 m/h at a heading of 48° = (670 cos 48 i + 670 sin 48 j)
= (448.32 i + 497.91 j) m/h
Velocity of the second is 560 m/h at a heading of 132° = ( 560 cos 132 i + 560 sin 132 j)
= (-374.71 i + 416.16 j) m/h
We know the equation displacement = Velocity * Time taken
Displacement of first plane after 2.2 hr = (448.32 i + 497.91 j)*2.2
= (986.304 i + 1095.402 j) miles.
Displacement of second plane after 2.2 hr = (-374.71 i + 416.16 j)*2.2
= (-824.362 i + 915.552 j) miles.
Displacement between two planes = (986.304 i + 1095.402 j) - (-824.362 i + 915.552 j)
= (1810.666 i + 179.868 j) mi
Distance between two planes after 2.2 hours =
So first plane is 1819.58 miles is far from second plane after 2. hours.
The energy that substance contain is. B.heat
Explanation:
The Advantages of Renewable Energy
One major advantage with the use of renewable energy is that as it is renewable it is therefore sustainable and so will never run out.
Renewable energy facilities generally require less maintenance than traditional generators. Their fuel being derived from natural and available resources reduces the costs of operation.
Even more importantly, renewable energy produces little or no waste products such as carbon dioxide or other chemical pollutants, so has minimal impact on the environment.
Renewable energy projects can also bring economic benefits to many regional areas, as most projects are located away from large urban centers and suburbs of the capital cities. These economic benefits may be from the increased use of local services as well as tourism.
The Disadvantages of Renewable Energy
It is easy to recognize the environmental advantages of utilizing the alternative and renewable forms of energy but we must also be aware of the disadvantages.
One disadvantage with renewable energy is that it is difficult to generate the quantities of electricity that are as large as those produced by traditional fossil fuel generators. This may mean that we need to reduce the amount of energy we use or simply build more energy facilities. It also indicates that the best solution to our energy problems may be to have a balance of many different power sources.
Another disadvantage of renewable energy sources is the reliability of supply. Renewable energy often relies on the weather for its source of power. Hydro generators need rain to fill dams to supply flowing water. Wind turbines need wind to turn the blades, and solar collectors need clear skies and sunshine to collect heat and make electricity. When these resources are unavailable so is the capacity to make energy from them. This can be unpredictable and inconsistent. The current cost of renewable energy technology is also far in excess of traditional fossil fuel generation. This is because it is a new technology and as such has extremely large capital cost.
Answer:
(A) The maximum height of the ball is 40.57 m
(B) Time spent by the ball on air is 5.76 s
(C) at 33.23 m the speed will be 12 m/s
Explanation:
Given;
initial velocity of the ball, u = 28.2 m/s
(A) The maximum height
At maximum height, the final velocity, v = 0
v² = u² -2gh
u² = 2gh
(B) Time spent by the ball on air
Time of flight = Time to reach maximum height + time to hit ground.
Time to reach maximum height = time to hit ground.
Time to reach maximum height is given by;
v = u - gt
u = gt
Time of flight, T = 2t
(C) the position of the ball at 12 m/s
As the ball moves upwards, the speed drops, then the height of the ball when the speed drops to 12m/s will be calculated by applying the equation below.
v² = u² - 2gh
12² = 28.2² - 2(9.8)h
12² - 28.2² = - 2(9.8)h
-651.24 = -19.6h
h = 651.24 / 19.6
h = 33.23 m
Thus, at 33.23 m the speed will be 12 m/s