Answer:
a) W = 2746.8[J]
b) W = 2992.05 [J]
Explanation:
Work is defined as the product of force by distance. We must bear in mind that the force that performs the work is the one that acts in the same direction of displacement.
For this case, we must calculate the weight of the woman, the weight is defined as the product of mass by gravity.
where:
w = weight [N] (units of Newtons]
m = mass = 56 [kg]
g = gravity acceleration = 9.81 [m/s²]
![w=56*9.81\\w=549.36[N]](https://tex.z-dn.net/?f=w%3D56%2A9.81%5C%5Cw%3D549.36%5BN%5D)
a)
where:
F = weight = 549.36[N]
d = distance = 5 [m]
![W = 549.36*5\\W = 2746.8[J]](https://tex.z-dn.net/?f=W%20%3D%20549.36%2A5%5C%5CW%20%3D%202746.8%5BJ%5D)
b)
The new mass will be the combination of the mass of the woman plus that of the load.
![m_{new} = 56+5\\m_{new}=61[kg]](https://tex.z-dn.net/?f=m_%7Bnew%7D%20%3D%2056%2B5%5C%5Cm_%7Bnew%7D%3D61%5Bkg%5D)
![w_{new}=61*9.81\\w_{new}=598.41[N]](https://tex.z-dn.net/?f=w_%7Bnew%7D%3D61%2A9.81%5C%5Cw_%7Bnew%7D%3D598.41%5BN%5D)
The new work done.
![W =598.41*5\\W=2992.05[J]](https://tex.z-dn.net/?f=W%20%3D598.41%2A5%5C%5CW%3D2992.05%5BJ%5D)
Explanation:
a) Three types of chemical bondings:
- Ionic bonding: Complete transfer of electrons from an electropositive atom to an electronegative atom.
- Covalent bonding: Equal sharing of electrons between the atoms with less or zero electronegativity difference.
- Metallic bonding: The bonding between the conduction electrons(electron cloud of delocalised electrons) and positively charged metal ions
b) Those elements are named as Noble gases which inert in nature that is less reactive due to fully filled electronic configuration.
Their general electronic configuration is given by:
n = principle quantum number
c) In an ionic bonding, electrons are transferred to the electronegative atom from the electropositive atom.
Electronegative: An atom which gains an electrons.Negative charge carrying ion is formed.
Electropositive : An atom which looses electrons.Positive charge carrying ion is formed.
d) This because the band width between the conduction band and valence band is large due to which electrons will not able to jump from valence band to conduction band.This makes the non metal poor electrical conductors.
Answer:
v_f = 3 m/s
Explanation:
From work energy theorem;
W = K_f - K_i
Where;
K_f is final kinetic energy
K_i is initial kinetic energy
W is work done
K_f = ½mv_f²
K_i = ½mv_i²
Where v_f and v_i are final and initial velocities respectively
Thus;
W = ½mv_f² - ½mv_i²
We are given;
W = 150 J
m = 60 kg
v_i = 2 m/s
Thus;
150 = ½×60(v_f² - 2²)
150 = 30(v_f² - 4)
(v_f² - 4) = 150/30
(v_f² - 4) = 5
v_f² = 5 + 4
v_f² = 9
v_f = √9
v_f = 3 m/s
Answer:
Part a)
Part b)
Explanation:
Part a)
Angular speed of the pedal is changing from 60 rpm to 90 rpm in 10 s
so the angular acceleration is given as
so we will have
now the tangential acceleration of the pedal is given as
Part b)
Total angular displacement made by the sprocket in the interval of 10 s is given as
now length of the chain passing over it is given as
He gets heavier due to the upward acceleration of the lift
