Answer:
1) v = 0.45 m/s
2) v = 0.65 m/s
3) v = 0.75 m/s
Explanation:
1) We can find the speed of the object by conservation of energy:
Where:
k: is the spring constant = 280 N/m
v: is the speed of the object =?
m: is the mass of the object = 5.00 kg
x: is the displacement of the spring
2) When the object is 5.00 cm (0.050 m) from equilibrium, the speed of the object is:
3) When the object is at the equilibrium position, the speed of the object is:
I hope it helps you!
Answer:
C: for objects at extremely fast speeds.
Explanation:
Newton's second law does not hold for extremely fast speeds, because then relativistic effects come into play, where Einstein's theory of special relativity is a more correct description.
The reason why F=ma does not hold for fast speeds is that, as an object moves faster and faster, the proportional relationship between force and acceleration does not hold. As an object moves faster and faster, it becomes harder and harder (requires more force) to accelerate it. because it gains mass as a virtue of its velocity (what's called relativistic mass).
For relativistic speeds, the correct modification of Newtons second law is:
where 
is the relativistic momentum:
Answer:
the answer is B
Explanation:
i got mine right when i did mine
Answer: B) They all orbit the sun
Explanation:
Answer:
Approximately 
.
Explanation:
The net force on the girl would be:
.
Under the assumptions, the net force on this girl would be equal to the tension force in the rope. All other forces on the girl would be balanced.
In other words, the tension force that the rope exerted on the girl would be 
. The girl would exert a reaction force on the rope at the same magnitude (
) in the opposite direction. This force would translate to a 
force on the boy towards the girl.
Under similar assumptions, the net force on the boy would also be . Since the mass of the boy is 
, the acceleration of the boy would be:
.
