Answer:-81.29 J
Explanation:
Given
mass of ball 
Length of string 
height of Room 
Gravitational Potential Energy is given by
where h=distance between datum and object
here Reference is ceiling
therefore 
Potential Energy of ball w.r.t ceiling
i.e. 81.29 J of Energy is required to lift a ball of mass 2.35 kg to the ceiling
Answer:
after t = 3 hours compound A remain 0.396 M
t = 12.98 hours
Explanation:
P = P_0*e^(-kt)
t = 30 minutes = 30/60 hours = 0.5 hours
and P_0 = 0.60M
and P after t = 0.5 hours is 0.56 M
(0.56/0.6) = e^(-kt)
0.933 =e^(-kt)
k = 0.138
P = P_0*e^(-0.138t)
Now after t = 3 hours,
P = 0.6* e^((-0.138)*3) = 0.396 M
time when P = 0.1 M
0.1 = 0.6*e^(-0.138t)
t = 12.98 hours
Ep = F * d
F = 20 N
d = 5 m
Ep = 20 N * 5 m
Ep = 100 J
So pick B. A Newton Meter is a joule.
Answer:
294.0724 N/C
Explanation:
From the question, we are given the following parameters: linear charge density,α = 4 nC/m = 4 × 10^9 C/m, radius, r= 2.5 m, the angle in the counter clockwise direction from the positive x-axis= θ= 287° and the Coulomb constant,Kc= 8.98755 × 109 N · m2 /C 2.
So, we can solve this question by using the formula below;
==>E(x direction)= - (Kc ×α )/ r × {sin 287° - sin 0°} i.
==>> - (8.98755 × 10^9 × 4 × 10^-9)/2.5 × { −0.9563047559630354
- 0} I.
==> -14.4 × [−0.9563047559630354].
==> 13.8 N/C i.
E( y direction)= - (Kc ×α )/ r × ( cos 0° - cos 287°) j.
==> -14.4 × (1 - [ 0.29237170472273672]).
==>( -14.4 × 0.7076) j.
==> - 10.18944 n/C j.
==>E(x direction)^2+ E( y direction)^2.
==> (13.8^2 + (- 10.18^2) N/C.
==> 190.44 N/C. + 103.6324 N/C.
= 294.0724 N/C
