m = mass of the ball attached to friction less surface = 2 kg
r = radius of the circle in which the ball moves = 0.5 meter
T = tension force in the string = 16 N
F = centripetal force
centripetal force is given as
F = m v²/r
the centripetal force required to move in circle is being provided by the tension force here , hence we can write
T = F
T = m v²/r
Tr = m v²
v² = Tr/m
v = √(Tr/m)
inserting the values in the equation above
v = √(16 (0.5)/2)
v = 2 m/s
Answer:
this effect is called SCREENING
Explanation:
When a positive charge is surrounded by several negative charges at a long distance, an apparent decrease in the positive charge is observed, this effect is called SCREENING and is noticeable in multielectronic atoms
This effect is responsible for the decrease in ionization energy in the larger atoms.
The correct answer would be A. boiling point. And the reason to that is because pH, toxicity, and rusting ability are all examples of chemical properties.
Answer
given,
mass of the ski = 75 Kg
speed of the skier, v = 3 m/s
time = 1.50 min = 90 s
angle of inclination, θ = 40°
distance = s x t
= 3 x 90 = 270 m
a) W = F. d cos θ
W = mg. d cos θ
W = 75 x 9.8 x 270 x cos 40°
W = 152021.52 J
work is done by the ski lift is equal to 152021.52 J
b) Power extended by the ski
![Power = \dfrac{Work\ done}{time}](https://tex.z-dn.net/?f=Power%20%3D%20%5Cdfrac%7BWork%5C%20done%7D%7Btime%7D)
![Power = \dfrac{152021.52}{90}](https://tex.z-dn.net/?f=Power%20%3D%20%5Cdfrac%7B152021.52%7D%7B90%7D)
P = 1689.13 Watt.
power is expended by the ski lift is equal to 1689.13 W.
Answer:
3.3 mm
Explanation:
The electric shaver is vibrating back and forward covering a distance of 2 mm, therefore, the amplitude of this vibration is always the half of the distance.
So the expression to use is:
A = D/2
A = 6.6 / 2 = 3.3 mm
Now, suppose you want the speed of this vibration:
V = 2πfA
V = 2π * 235 * 0.0033
V = 4.87 m/s