Answer:
I think it's B: b.
Use the number that lines up with the bottom part of the blue line on the left of the thermometer
Explanation:
The liquid in the thermometer makes a "U" crescent and you have to use the bottom of the "U" touches the the lines on the side.
Answer:
<h3><em>D</em><em>.</em><em> </em><em>T</em><em>o</em><em>t</em><em>a</em><em>l</em></h3>
Explanation:
<em>A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons</em>
Answer:
Newtons 3rd law
Explanation:
Newtons third law states; for every action, there is an equal but opposite reaction force.
The action force in this case in the foot kicking the soccer ball, but the reaction force is the ball 'kicking' back on the foot. This reaction force has the same magnitude as the action force, but opposite in direction, which is why the foot is left stinging.
By using the coefficient of linear expansion, the increase in the length of the metal plate is by 0.015m and in the area is by 0.3074
.
The rate of change in length of a metal per degree change in temperature is known as the coefficient of linear expansion.
Given:
Coefficient of linear expansion, α = 29 x
/k
Length, L1 = 10m
T1 = 25℃
T2 = 78℃
ΔT = 78 – 25 = 53℃
To find:
Change in length (ΔL) and area (ΔA) of metal plate = ?
Formula:
ΔL = α L1 ΔT
ΔA = A1 2 α ΔT
Calculations:
ΔL = 29 x
x 10 x 53
ΔL = 0.01537m
ΔA = 100 x 2 x 29 x
x 53
ΔA = 0.3074![m^2](https://tex.z-dn.net/?f=m%5E2)
A2 = 100.3074![m^2](https://tex.z-dn.net/?f=m%5E2)
Result:
The increase in the length and area is by 0.015m and 0.3074
respectively.
Learn more about Coefficient of linear expansion of metals here:
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Answer:
0.31 m
Explanation:
m = mass of the block = 1.5 kg
H = height from which the block is released on ramp = 0.81 m
k = spring constant of the spring = 250 N/m
x = maximum compression of the spring
using conservation of energy
Spring potential energy gained by spring = Potential energy lost by block
(0.5) k x² = mgH
(0.5) (250) x² = (1.5) (9.8) (0.81)
x = 0.31 m