In which situation is no work being done? A. a person carrying a box from one place to another B. a person picking up a box from
2 answers:
Answer:
A person carrying a box from one place to another.
Explanation:
The work done is defined as the product of force, displacement and the angle between the force and displacement. Mathematically, it can be written as :
Where
is the angle between the force and the displacement
When , then W = 0 (since, cos 90 = 0)
The situation in which no work being done is (a) " a person carrying a box from one place to another". In this case, the force acting on the person is gravitational force only which acts in downward direction and the person is carrying box from one place to another. So, the angle between the force and displacement is 90 degrees. Hence, no work being done.
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So, the time needed before you hear the splash is approximately <u>2.06 s</u>.
<h3>Introduction</h3>Hi ! In this question, I will help you. This question uses two principles, namely the time for an object to fall freely and the time for sound to propagate through air. When moving in free fall, the time required can be calculated by the following equation:
With the following condition :
- t = interval of the time (s)
- h = height or any other displacement at vertical line (m)
- g = acceleration of the gravity (m/s²)
Meanwhile, for sound propagation (without sound reflection), time propagates is the same as the quotient of distance by time. Or it can be formulated by :
With the following condition :
- t = interval of the time (s)
- s = shift or displacement (m)
- v = velocity (m/s)
We know that :
- h = height or any other displacement at vertical line = 19.6 m
- g = acceleration of the gravity = 9.8 m/s²
- v = velocity = 343 m/s
What was asked :
= ... s
Step by step :
- Find the time when the object falls freely until it hits the water. Save value as
- Find the time when the sound propagate through air. Save value as
- Find the total time
So, the time needed before you hear the splash is approximately 2.06 s.
Answer:
a
b
Explanation:
From the question we are told that
The spring constant is
The maximum extension of the spring is
The number of oscillation is
The time taken is
Generally the the angular speed of this oscillations is mathematically represented as
where T is the period which is mathematically represented as
substituting values
Thus
this angular speed can also be represented mathematically as
=>
substituting values
In SHM (simple harmonic motion )the equation for velocity is mathematically represented as
The velocity is maximum when
=>
=>
=>