Answer:
B. 34.78 m/s
Explanation:
The momentum of an object is given by:
where
p is the momentum
m is the mass of the object
v is its velocity
For the object in this problem, we have
p = 4000 kg m/s
m = 115 kg
So, we can solve the equation to find v, the velocity:
Energy is transferred.
<h3>What is Work?</h3>
Every time labour is performed, energy is transmitted, as shown by the definition of work in physics. Work is the result of the displacement's magnitude and the component of force acting in that direction.
What are 3 types of work done?
- Positive
- Negative
- Zero work done.
Work is the result of force and distance, or the force exerted over a specific distance. In other words, Work = Force x Distance.
Joules are used to measure work.
1. Positive Work: Positive work is when a force moves an object in that direction. The motion of a ball descending toward the earth while it is displaced in the direction of the force of gravity is an illustration of this type of labour.
2. Negative Work: The work is said to be negative if the force and the displacement are in the opposing directions. For instance, if a ball is thrown high, its displacement will also be upwards, while the force from the earth's gravity will be downward.
3. Zero Work: When the force and displacement directions are parallel to one another, there is no work done on the item by the force.
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The atom is neutral (no electric charge)
Explanation:
An atom consists of:
- A nucleus, containing protons (positively charged) and neutrons (no electric charge)
- Electrons (negatively charged), orbiting around the nucleus
The charge of one proton is equal in magnitude (but opposite in sign) to that of an electron, and it is
Moreover, for a normal atom, the number of protons in the nucleus is equal to the number of electrons around it.
This means that for a normal atom, the net charge of it is zero, since the total charge of the protons balance that of the electrons.
So, the answer to the question is that the atom is neutral.
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Answer:
created, destroyed, transforms
Explanation:
Energy cannot be created nor destroyed.
Energy is transformed from one form to another form.
- This is the postulate of the law of conservation of energy.
Energy is neither created nor destroyed simply implies that energy is not produce in any system. Nor is it destroyed.
What we have is energy transformation from one form to another.
Answer:
μ = 0.66, therefore if it compiesy with the regulations
Explanation:
Let's solve this exercise in part, let's start by finding with kinematics the acceleration of man
y = v₀ t + ½ a t²
as it starts from rest the initial velocity is zero
y = ½ a t²
a =
a =\frac{2 \ 4.38}{1.21^2}
a = 6.46 m / s²
Now let's use Newton's second law,
Axis y
N- W = 0
N = W
N = m g
X axis
on this axis the man exerts a backward force and by the law of action and reaction the floor exerts a forward force of the same magnitude, this forward force is the friction force.
fr = m a
the friction force has an expression
fr = my N
let's substitute
μ mg = m a
μ = a / g
let's calculate
μ = 6.46 / 9.8
μ = 0.66
therefore if you comply with the regulations