Answer:
(a) Negative Q
(b) Positive Q
Explanation:
Charge is the inherent property of matter due to the transference of electrons.
There are three methods of charging a body.
(i) Charging by friction: When two uncharged bodies rubbed together, then one body gets positive charged and the other is negatively charges it is due to the transference of electrons form one body to another.
(ii) Conduction: when a charged body comes in contact with the another uncharged body, the uncharged body gets the same charge and the charge is distributed equally.
(iii) Induction: When a uncharged body keep near the charged body, the uncharged body gets the same amount of charge but opposite in sign.
(a) When a small tack of charge Q is lowered into the hole, then due to the process of induction, the charge on the inner surface of the shell is - Q.
(b) Due to the process of conduction, the charge on the outer surface of the shell is Q.
Answer:
3.9 × 10^7 J
Explanation:
Given that a tank is is half full of oil that has a density of 900 kg/m3. Find the work W required to pump the oil out of the spout. (Use 9.8 m/s2 for g. Assume r = 15 m and h = 5 m.) W = 1.59 J
Solution
Since the tank is half full, the height = 2.5m
Pressure = density × gravity × height
Pressure = 900 × 9.8 × 2.5
Pressure = 22050 Pascal
The cross sectional area of the pump will be area of a circle.
A = πr^2
A = π × 15^2
A = 706.858 m^2
Using the formula
Density = mass/volume
Mass = density × volume
Mass = 900 × 706.86 × 2.5
Mass = 1590.435
Energy = mgh
Energy = 1590.435 × 9.8 × 2.5
Energy = 38965657.8 J
Since the work done = energy
Therefore, the work done = 3.9 × 10^7 J
Answer:
because when you shape glass it's not a shiny as diamond
Answer:
A)0.456 rev/s
B) 0.075 rev
C) 1.06 m/s
D) 3.7 m/s²
Explanation:
Initial angular velocity = 
= 0.270 rev/s = 1.6965 rad/s
Angular acceleration = α = 0.899 rev/s/s = 5.64858 rad/s/s
Radius = r = 0.74/2 = 0.37 m
Time = t = 0.207 s
A) Final angular velocity is given by the equation
=
=1.6965 + (5.64858)(0.207) = 2.87 rad/s = 0.456 rev/s
B) No. of revolutions is calculated using the equation
= 0.472 rad = 0.075 revolutions
C) v = r ω =(0.37)(2.87) = 1.06 m/s
D) Centripetal acceleration = 
= (0.37) (2.87)² =3.05 m/s²
Tangential acceleration =
= ( 0.37)(5.64858) = 2.08997 m/s²
Resultant acceleration = 
= 3.697 m/s²
