Understand future consequences, for tell the future, control urges, and delayed gratification
Answer:
a) T1 = 7.48 N
b) T2 = 18.09N
c) I = 0.0115 kgm^2
Explanation:
Mass of textbook= 2.08kg
Diameter of cord = 0.130m
Radius = 0.130/2 = 0.065m
Distance = 1.30m
Time interval = 0.830 sec
From equation of motion,
S = ut + 1/2at^2
U = initial velocity = 0
S = 1/2at^2
2S = at^2
a = 2S/t^2
a = 2(1.3) / 0.830^2
a = 3.77 m/s^2
T1 = m1*a ..........(1)
m2g - T2 = m2a..........(2)
T1 = (2.08)(3.77)
T1 = 7.84N
m2g - T2 = m2a
T2 = m2g - m2a
T2 = m2(g - a)
T2 = 3(9.80 - 3.77)
T2 = 3(6.03)
T2 = 18.09N
Moment of inertia (I)
I = [(T2 - T1) r^2]/a
I = [(18.09 - 7.84)(0.065)^2]/ 3.77
I = (10.25)(0.065)^2 / 3.77
I = 0.0115 kgm^2
Information provided:
Length of wire, L = 320 m
Current through the wire, I = 120 Amps
Earth's magnetic field acting on the wire, B = 5.0*10^-5 T
Angle at which the magnetic field acts, Ф = 60°
By definition;
Force on the wire, F = LBI Sin Ф
Substituting;
F = 320*5*10^-5*120*Sin 60 = 1.663 N
Answer:
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In a cold pack, an endothermic reaction draws heat from the surroundings, although there are several different types of cold packs, some with different reactions.