A ball is thrown upward with an initial velocity of 48 ft/s from a height 864 ft. h = -16t +48t +864 After how many seconds will
1 answer:
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Explanation:
It is known that energy balance relation is as follows.
Also,
so,
According to the ideal gas equation,
Putting the values into the above equation as follows.
=
= 693.3 R
Now, we will convert the temperature into degree Fahrenheit as follows.
693.3 - 458.67
=
From table A-
= 0.240 Btu/lbm R and
= 0.171 Btu/lbm
Now, we will substitute the energy balance as follows.
=
= 59.3 Btu
Thus, we can conclude that final temperature of air is 59.3 Btu.
The final speed of the cart and the bag is 2.2 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum: in fact, in absence of external forces, the total momentum of the bag and the cart must be conserved before and after the collision.
Mathematically:
where:
is the mass of the bag of rice
is the initial velocity of the bag
is the mass of the cart
is the initial velocity of the cart (at rest)
is the final combined velocity of the bag and the cart
Re-arranging the equation and solving for v, we find:
Learn more about momentum here:
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