Answer:
The speed of the kid and the skateboard together is 0.723 m/s
Explanation:
Let the mass of the kid be
Let the mass of the skateboard be
The initial speed of the skateboard,
The initial horizontal speed of the boy as he jumps on the skateboard,
Let the speed of the kid and the skateboard together be v
According to the principle of conservation of momentum:
Substituting the appropriate values into the given equation
36 = 49.8 v
v = 36/49.8
v = 0.723 m/s
A job is done slowly and an identical job is done quickly then they require same amount of work, but different amounts of power.
Answer: Option B
<u>Explanation:
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Work done is the amount of force required to displace an object from its original position. So as force depends on mass of the object. The work will remain constant for doing a particular job related to same object. But power defines the work done per unit time.
So if power is increased for a given work means the time required to do that work is reduced. So if a particular work has to be performed on a same object then by manipulating the power we can change the time taken to complete that job.
So in this case for the identical job, one is completed slowly while other has been done quickly. This indicates that they required same amount of work as the kind of job is same but different amount of power depending on which the work is done fast or slowly.
Answer:
speed- distance traveled per unit of time.
velocity-rate of change of its position
acceleration-rate of change of the velocity
Explanation:
Electromagnetic waves can travel through a vacuum; mechanical waves require a medium.
I don't believe there is a specific amount of time that it takes to learn. Some people may learn faster than others. What matters is that you practice consistently and you will learn at a faster pace than if you don't practice often.