In order to calculate the unknown reaction force, we need to know that the sum of forces pointing down is equal the sum of the forces pointing up, so all forces will be in equilibrium.
So we have:
A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force co
nstant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden block (where it becomes embedded), the spring compresses by 25 cm.
a) What is the maximum potential energy of the spring?
(b) What was the speed of the arrow and block just after collision?
(c) What was the initial kinetic energy of the arrow?
(d) Explain any difference between (a) and (b).
a) What is the maximum potential energy of the spring?
(b) What was the speed of the arrow and block just after collision?
(c) What was the initial kinetic energy of the arrow?
(d) Explain any difference between (a) and (b).
1 answer:
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Given :
The mass of the balloon was 1890 kg and had a volume of 11,430 m3 .
The balloon floats at a constant height of 6.25m above the ground.
To Find :
The density of the hot air in the balloon.
Solution :
We know,
Volume × ( Density of surrounding air - Density of hot air ) = mass
Putting given values in above equation, we get :
Therefore, the density of hot air in the balloon is 1.125 kg m³.