When you rub a balloon on a sweater, for example, some electrons come off and end up on the balloon. The fibers have lost electrons giving them a positive charge. The rubber gained electrons giving it a negative charge. ... The positively charged fibers are now attracted to the negatively charged balloon.
Answer:
Damping constant is equal to 
Explanation:
We have given mass m = 1 kg
Spring constant is given 
For critical damping 
We have to find the damping constant
Damping constant is equal to 
So 


So damping constant is equal to 
A contact force are forces that require actual contact (touch) of two pieces of matter.
Distant force is a force that works at a distance not needing any contact (touch) at all.
Answer:
T = 99.51 hour
Explanation:
Mass of Uranus, 
The moon Umbriel orbits Uranus at a distance of 
We need to find Umbriel's orbital period. Let it is T. Using Kepler's third law of motion to find it.

As 1 hour = 3600 s
358244.51 s = 99.51 hour
Hence, Umbriel's orbital period is 99.51 hour.
Answer:
750J
Explanation:
Given parameters:
Mass of the object = 0.15kg
Velocity of the object = 100m/s
Unknown:
Kinetic energy of the body = ?
Solution:
The kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E =
m v²
m is the mass of the body
v is the velocity
Now insert the parameters and solve;
K.E =
x 0.15 x 100² = 750J