Answer:
h = 16.9 m
Explanation:
When a ball is thrown upward, its velocity gradually decreases, until it stops for a moment, when it reaches the maximum height, while its height increases. Thus, the law conservation of energy states in this case, that:
Kinetic Energy Lost by Ball = Potential Energy Gained by Ball
(0.5)m(Vf² - Vi²) = mgh
h = (0.5)(Vf² - Vi²)/g
where,
Vf = Final Speed of Ball = 0 m/s (Since, ball stops for a moment at highest point)
Vi = Initial Speed of Ball = 18.2 m/s
g = acceleration due to gravity = - 9.8 m/s² ( negative for upward motion)
h = maximum height the ball can reach = ?
Therefore, using values in the equation, we get:
h = (0.5)[(0 m/s)² - (18.2 m/s)²]/(-9.8 m/s²)
<u>h = 16.9 m</u>
Explanation:
The junction rule says that the sum of the currents going into a junction must equal the sum of the currents leaving a junction. This describes the conservation of current.
Explanation:
a. " for every action there is an equal and opposite reaction".
b. The electric fan does not stop moving just after the switch turns off because of rational inertia force.
c. The force applied to first vehicle is 120N.
d. In my view it doesn't support the law of conservation of momentum. Momentum of 1 and 2 object before the collision is equal to the total momentum of two object after collision.
Answer:
The mass flow rate of air is 0.732 kg/s.
The velocity at the exit is 5.927 m/s.
Explanation:
Given that,
Diameter = 28 cm
Enter pressure= 200 kPa
Enter temperature = 20°C
Velocity = 5 m/s
Exit pressure = 180 kPa
Exit temperature = 40°C
We need to calculate the mass flow rate of air
Using formula of mass flow rate
Put the value into the formula
We need to calculate the volume flow rate
Using formula of volume flow rate
We need to calculate the velocity at the exit
Using formula of velocity
Put the value into the formula
Hence, The mass flow rate of air is 0.732 kg/s.
The velocity at the exit is 5.927 m/s.
