The difference in speed is due to the different densities of the two mediums.
In fact, the higher the density of the medium, the greater the speed of sound. Sound travels faster in liquids (e.g. water) than in gases (e.g. air) because liquids are more dense than gases. This is due to the fact that in liquids, molecules are closer to each other, and since sound is essemptially vibration of molecules, these vibrations are transmitted faster from molecule to molecule in a more dense medium (such as a liquid) rather than in a less dense medium (such as a gas)
Answer:
The number of electrons need to leave each object is
Explanation:
Given that,
Mass of object = 6.22 kg
Distance = 1.02 m
We need to calculate the number of electron
Using formula of electric force
....(I)
We know that,
Put the value of q in equation (I)
.....(II)
Using gravitational force
.....(III)
Equating equation (II) and (III)
....(IV)
Put the value in the equation(IV)
Hence, The number of electrons need to leave each object is
Answer:
A. Both sources are positively charged.
Explanation:
Before answering, let's remind what is the direction of the electric field lines for a positive charge and a negative charge. Keeping in mind that the direction of the field lines is given by the direction of motion of a positive test charged place in that electric field, we have:
- For a positive charge, field lines point away from the charge (because a positive test charge will move away from the source of the field)
- For a negative charge, field lines point towards the charge (because a negative test charged will move towards the source of the field)
In this example, we see that field lines point away from both charges A and B. therefore, both sources are positively charged.
Answer:
Weight of the object will be 195.6 N
Explanation:
We have given mass of the object m = 20 kg
And acceleration due to gravity at any location is given
We have to find the weight of the object in N at the location where value of acceleration due to gravity is
Weight of the object is given by W = mg , here W is weight , m is mass and g is acceleration due to gravity
So weight W = 20×9.78 = 195.6 N
So weight of the object will be 195.6 N
Answer:
The angular momentum is
Explanation:
From the question we are told that
The mass of the woman is
The angular speed of the rim is
The mass of the disk is
The radius of the disk is
The moment of inertia of the disk is mathematically represented as
substituting values
The moment of inertia of the woman is
substituting values
The moment of inertia of the system (the woman + the large disk ) is
substituting values
The angular momentum of the system is
substituting values