Answer:
Explanation:
Recall that density is defined as and that relative uncertainty is defined as where is the uncertainty in the measure and a the measure, To find the uncertainty when two physical quantities are divided, their relative uncertainties are added and then multiplied with the division result of the quantities.
We have:
To find the percent uncertainty, we multiply the relative uncertainty by 100%.
Answer:
a point representing the mean position of the matter in a body or system.
Explanation:
Answer:
(a) -136.8 Ns.
(b) -1.135 N
Explanation:
(a)
Impulse: This can be defined as the change in momentum.
From the question,
I = mv-mu.................. Equation 1
Where I = impulse, m = mass of the hammer, v = final velocity, u = initial velocity.
Given: m = 18 kg, u = 7.6 m/s, v = 0 m/s (to rest)
Substitute these values into equation 1
I = 18(0)-18(7.6)
I = -136.8 Ns.
(b)
Average force = It.............. Equation 2
Where t = time.
Given: t = 8.3 ms = 0.0083 s.
Average force = -136.8(0.0083)
Average force = -1.135 N
Answer:
50 out of 100 (ik its right)
Answer:
The work-energy theorem states that a force acting on a particle as it moves over a <u>distance</u> changes the <u>kinetic</u> energy of the particle if the force has a component parallel to the motion.
Explanation:
The correct answer is presented below and all reasons are presented to explain all facts:
The work-energy theorem states that a force acting on a particle as it moves over a <u>distance</u> changes the <u>kinetic</u> energy of the particle if the force has a component parallel to the motion.
Reasons:
According to the Work-Energy Theorem, the work done on a particle () equals the change in its kinetic energy (). That is:
(1)
By definition of work we expand this definition:
(2)
Where:
- Vector force.
- Vector travelled distance.
And by definition of dot product we conclude that:
Where:
- Magnitude of the vector force.
- Magnitude of the differential of the vector travelled distance.
- Angle between vectors, measured in sexagesimal degrees.
- Initial and final position of the particle.
From this expression we infer that change in kinetic energy is maximum if and only if in every point of the path travelled by the particle. In addition, change in kinetic energy occurs when component of force parallel to path is not zero.