Answer:
m = 69.9 kg
Explanation:
The mass and the weight of an object are two different quantities. Mass is basically the amount of matter that is present in a body. It remains same everywhere in the universe and measured in kilograms.
Weight is basically a force. It is the force by which earth attracts everything towards itself. The weight of an object changes from planet to planet, with the change in value of the gravitational acceleration (g).
Therefore, the relation between mass and weight of an object is given by the following formula:
W = mg
m = W/g
where,
m = mass = ?
W = Weight = 685 N
g = 9.8 m/s²
Therefore,
m = (685 N)/(9.8 m/s²)
<u>m = 69.9 kg</u>
Use the definition of average acceleration:
<em>a</em> = ∆<em>v</em> / <em>t</em>
If <em>v</em> is the starting speed, then ∆<em>v</em> = 0 - <em>v</em>, so solve for <em>v</em> :
-6.42 m/s² = (0 - <em>v</em>) / (2.85 s)
<em>v</em> = (6.42 m/s²) (2.85 s)
<em>v</em> ≈ 18.3 m/s
Answer:
Gravitational force
Explanation:
Gravitational force is force of attraction which acts between any two bodies having mass. It is a fundamental force and is the weakest of all the fundamental forces.
Katie and Jon have force of attraction between them and it is the gravitational force.
Electrostatic force acts between charged particles. It can be attractive or repulsive in nature.
Option A is correct. The pendulum will slow down and eventually stop moving as the mechanical energy transforms to thermal energy.
<h3>What is the law of conservation of energy?</h3>
According to the Law of conservation of energy. Energy can not be created nor be destroyed it can transfer from one to another form.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
When the pendulum is executing the to and fro motion the air resistance is also acting on it. Due to that air resistance, the energy is utilized to overcome resistance and convert it into thermal energy,
Hence option A is correct. The pendulum will slow down and eventually stop moving as the mechanical energy transforms to thermal energy.
To learn more about the law of conservation of energy refer to the link;
brainly.com/question/2137260
Silver
Take a look at the chart attached for most conductive
