Answer:
Explanation:
in parallel combination equivalent resistence =
1/R=1/R1 + 1/R2
1/2=1/15+1/30
1/2=1*2+1*1/30
1/R=3/30
R*3=30*1
R=30/3
R=10 ohm
Tennis ball will move with 1/3 th velocity of plastic ball
Answer:
True
Explanation:
The photoelectric effect can be classified that the photon or electron emission from the atom surface when certain amount or can say that the incident particle hit by some threshold energy to the surface.
This incident particle will change the kinetic energy change of the ejected photon.
So, by the above discussion we know that work energy is change in the kinetic energy and there is also change in kinetic energy occur in the process. So, work energy can be say that the amount of threshold energy to dislodge or eject a photon from the atom.
KE = half of mass times squared speed
KE1 = 0.5 * 2 kg * (2 m/s)^2 = 4 J
KE2 = 0.5 * 4 kg * (3 m/s)^2 = 18 J
Second had more.
Rate of change of velocity is called acceleration. When this rate of change is constant, it is called uniform acceleration. Like the change of velocity of an object falling freely under gravity. Its velocity increases by 9.8 m every second. This acceleration is denoted as 9.8m/s^2