Answer:
Explanation:
The hand provides Kinetic Energy in moving.
The KE is transformed to Frictional energy
The Frictional Energy can produce heat and light energy.
The sandpaper produces little shreds from the grit of the paper.
The shreds have KE (they move)
Answer : 6.022• 10^23 atoms of potassium
Answer:
F = 36 kN
Explanation:
It is given that,
The pressure on the base of the fish tank is 4000N/m².
The base of the tank is a rectangle measuring 2.0m by 4.5m.
Area of the base of the tank is 9 m²
We need to find the force on the base caused by the base of the water. Pressure on the base of the tank is given by the force acting per unit area such that,

So, the force of 36 kN is acting on the base by the base of water.
Answer:
I think it is acute angle.
Explanation:
Because it is an angle between 0° and 90°. Hope this answer wil help you.
Answer:


Explanation:
m = Order = 1
D = Distance between screen and slit = 3.09 m
d = Slit distance = 1.01 mm
= Wavelength = 639 nm
Distance from the first bright fringe from the central bright fringe is given by

Distance from the first bright fringe from the central bright fringe is 
Distance from the second dark fringe from the central bright fringe is given by

Distance from the second dark fringe from the central bright fringe is
.