Why do balloons make noise when they pop?
2 answers:
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Answer:
78.498N
Explanation:
The Net force provided by the spinnaker can be obtained from Newton's second law of motion as follows;
where m is the mass, v is the final velocity, u is the initial velocity and t is the time interval for which the force acted.
Given;
m =980lb
v = 12mi/h
u =8mi/hr
t = 10s.
It is important to convert all quantities to their SI units where necessary, so we do that as follows;
1lb = 0.45kg,
hence 980lb = 980 x 0.45kg = 441kg.
1mile = 1609.34m
1hour = 3600s,
therefore;
Substituting all values into equation (1), we obtain the following;
Answer:
5.886 J
Explanation:
Given:
The mass of the book is, kg
Height of lift is, m
Acceleration due to gravity is, m/s²
Now, gain in gravitational potential energy is a function of change in position and is given as:
Here, is the change in gravitational potential energy.
Plug in 0.5 kg for , 9.81 for
and 1.2 for
. Solve for
Therefore, the gain in gravitational energy of the book is 5.886 J.