Answer:
Weight needed to balance the bar is ![8.5N](https://tex.z-dn.net/?f=8.5N)
Explanation:
Given the weight of the bar is ![8N](https://tex.z-dn.net/?f=8N)
The length of the bar is ![5m](https://tex.z-dn.net/?f=5m)
The weight of the bar will be uniformly distributed over the entire span. We will consider this as a point load acting in the middle of span length, which is at a distance of
from both ends.
Now applying momentum equation about balanced load we get, (see attachment)
![\sum m_i=0\\2(m)+8(1)-8(0.5)-7(3)=0\\2m+8-4-21=0\\2m-17=0\\2m=17\\m=\frac{17}{2}=8.5\\So,\ m=8.5N](https://tex.z-dn.net/?f=%5Csum%20m_i%3D0%5C%5C2%28m%29%2B8%281%29-8%280.5%29-7%283%29%3D0%5C%5C2m%2B8-4-21%3D0%5C%5C2m-17%3D0%5C%5C2m%3D17%5C%5Cm%3D%5Cfrac%7B17%7D%7B2%7D%3D8.5%5C%5CSo%2C%5C%20m%3D8.5N)
Answer:
B
Explanation:
Energy at the top of the hill = energy at the bottom of the hill + energy lost
PE = KE + E
mgh = 1/2 mv² + E
(52 kg) (9.8 m/s²) (50.0 m) = 1/2 (52 kg) (25 m/s)² + E
25480 J = 16250 J + E
E = 9230 J
Answer:
E) the flow of energy due to a temperature difference.
Explanation:
Heat can be described as the flow of energy due to a temperature difference.
Which is expressed mathematically as;
H = MCΔT
Where;
H is the quantity of heat in a body, measured in Joules
M is the mass of the body, measured in kg
C is the specific heat capacity of the body, J/kg.K
ΔT is change in temperature or temperature difference.
So, heat energy in any system flows from a hotter region to a colder region due to temperature difference.
E) the flow of energy due to a temperature difference.
bad handwriting tho........... hope u understand