Answer:
16.1 m/s
Explanation:
We can solve the problem by using the law of conservation of energy.
At the beginning, the spring is compressed by x = 35 cm = 0.35 m, and it stores an elastic potential energy given by
where k = 316 N/m is the spring constant. Once the block is released, the spring returns to its natural length and all its elastic potential energy is converted into kinetic energy of the block (which starts moving). This kinetic energy is equal to
where m = 0.15 kg is the mass of the block and v is its speed.
Since the energy must be conserved, we can equate the initial elastic energy of the spring to the final kinetic energy of the block, and from the equation we obtain we can find the speed of the block:
Answer:
Because psuedoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.
And it is most of the time false
Explanation:
Answer:
A non-contact force is a force which acts on an object without coming physically in contact with it.
Explanation:
For example:
<em>Gravitational force.</em>
<em>Magnetic force.</em>
<em>Electrostatics.</em>
<em>Nuclear force.</em>
The current flowing into the branches, or branch current, is divided according to the resistance in the branch that it is going into. Loop current remains the same.
Answer:
(a) Work done by the tension force is 987 J
(b) Coefficient of kinetic friction between the crate and surface is 0.495
Explanation:
(a)
Work done by any force F in moving an object by a distance d making an angle 
with the direction of force is given by
Thus work done by the tension force is 987 J
(b)
Normal force on the crate is given by
=>N=332 Newtons
Since crate is moving with constant speed . Therefore using Newtons second law .
Where 
=coefficient of kinetic friction
=>
=>
Thus coefficient of kinetic friction between the crate and surface is 0.495
