If the type of friction is sliding friction, it may be increased by increasing the roughness of the surface and may be decreased by smoothing the surface or applying a lubricant.
Answer:
The value of L is 0.3 nm.
Explanation:
Given that,
Energy 
Transmission probability = 10⁻³
We need to calculate the value of L
We know that,
Formula of tunneling probability
....(I)
Where,
....(II)
Where, m = mass of electron


Put the value in equation (II)


From equation (I)






Hence, The value of L is 0.3 nm.
Answer:
Electrical energy, Heat energy and Light energy.
Explanation:
Lighting a table lamp requires electricity and after being light up, light energy is produced and you will feel heat around it.
Answer:
Mass is the same, weight is less.
Explanation:
We know the following equation
W = mg
where m is the mass of the astronaut which is constant and W is the weight. As g (the acceleration due to gravity) is a variable which it is directly proportional to the W, if g is lower on the Moon than on Earth, then W is lower on the Moon than on Earth.
Answer:
Part a)

Part b)

Explanation:
Part a)
As we know that the diameter of the planet is given as

now the radius of the planet is given as

now we know that the acceleration due to gravity of the planet is given by the equation

here we know that

now from above equation we have

now we have

Part b)
Now by kepler's law we know that
time period of revolution of planet about the star is given as

so we have

now we have


mula of time period

Now we have
