(EXPLANATION)They have been charged by contacting while they rub against others, and therefore, are attracted to clothing that is neutral or has an opposite charge.
In laundry terms, static cling is the result of an electric charge build-up due to a fabric brushing up against one another which occurs during the tumble-drying process. Static cling is more prevalent during winter because of the dry air. Luckily, there are some ways to get rid of static on clothes from the get-go
Answer:
8 J and 2 J
Explanation:
Given that,
Mass of the rubber ball, m = 1 kg
Initial speed of the rubber ball, u = 4 m/s (in east)
Final speed of the rubber ball, v = -2 m/s (in west)
We need to find the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall.
Initial kinetic energy,
Final kinetic energy,
So, the initial kinetic energy is 8 J and the final kinetic energy is 2 J.
Answer:
a) 342 m/s
b) 51*10^-6 m/s
c) 0.87m/s^2
Explanation:
The following function describes the displacement of the molecules in a sound wave:
(1)
The general form of a function that describes the same situation is:
(2)
By comparing equations (1) and (2) you have:
k: wave number = 50.00 m^-1
w: angular frequency = 1.71*10^4 s^-1
A: amplitude of the oscillation = 3.00nm
a) The speed of the sound is obtained by using the formula:
b) The maximum speed of the molecules is the maximum value of the derivative of s(x,t), in time. Then, you first obtain the derivative:
The max value is:
= 51*10^-6 m/s
c) The acceleration is the max value of the derivative of the speed, that is, the second derivative of the displacement s(x,t):
Then, the maximum acceleration is:
Answer: B, increase the rate at which he turns the crank
Explanation: i got it right
A neutral atom has a charge of zero which means that the number of protons or the positive charges is equal to the number of electrons or the negative charges. In this case, if the charge is zero, this should mean that the number of electrons is 2 less than the number of protons present in the atom.