A girl sits on a tire swing and is pushed in a circular motion by her father. Her tangential speed is 2.8 m/s and the girl trave
2 answers:
Answer:
The girl's centripetal acceleration is 3.92 m/s².
Explanation:
Given that,
Tangential speed = 2.8 m/s
Diameter = 4.0 m
We need to calculate the centripetal acceleration
Using formula of centripetal acceleration
Where, v = tangential speed
r = radius
Put the value into the formula
Hence, The girl's centripetal acceleration is 3.92 m/s².
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Answer:
Explanation:
m = Mass of object =
m' = Mass of water =
= Density of object
= Density of water
Weight of the water displaced is the force in the case of floating objects
According to the question
In the case of floating objects
The ratio of the density of the object to that of water is
Answer: h = 3R
Explanation:
Using the law of conservation of energy,
Total energy at the beginning of the launch would be equal to total energy at any point.
kinetic energy + gravitational potential energy = constant
Initial energy of the projectile =... (1)
where R is the radius of the Earth, M is the mass ofthe Earth, m is the mass of the projectile.
escape velocity,
Total energy at height h above the Earth where speed of the projectile is half the escape velocity:
...(2)
(1)=(2)
⇒
⇒
⇒
⇒
⇒h = 3R
Thus, at height equal to thrice radius of Earth, the speed of the projectile would reduce to half of escape velocity.