Basic truss bridge types found in North Carolina (source: HAER) A truss bridge can be characterized by the location of its traffic deck. At a pony truss, the travel surface passes along the bottom chords of trusses standing to either side that are not connected to each other at the top.
Answer:
mass.
Explanation:
other physical factors are changeable but the mass of a particular substance is always constant.
The reasoning for this is false
Answer:
Explanation:
a ) work done by gravitational force
= mg sinθ ( d + .21)
Potential energy stored in compressed spring
= 1/2 k x²
= .5 x 431 x ( .21 )²
= 9.5
According to conservation of energy
mg sinθ ( d + .21) = 9.5
3.2 x 9.8 x sin 30( d + .21 ) = 9.5
d = 40 cm
b )
As long as mg sin30 is greater than kx ( restoring force ) , there will be acceleration in the block.
mg sin30 = kx
3.2 x 9.8 x .5 = 431 x
x = 3.63 cm
When there is compression of 3.63 cm in the spring , block will have maximum velocity. there after its speed will start decreasing.
Answer:
The current is 0.248 A
Explanation:
Given that,
Inductor ![L= 45\times10^{3}\ H](https://tex.z-dn.net/?f=L%3D%2045%5Ctimes10%5E%7B3%7D%5C%20H)
Resistance ![R= 60\Omega](https://tex.z-dn.net/?f=R%3D%2060%5COmega)
Voltage = 15 volt
Time ![t =7.0\times10^{-3}\ sec](https://tex.z-dn.net/?f=t%20%3D7.0%5Ctimes10%5E%7B-3%7D%5C%20sec)
We need to calculate the current
Using formula of current
![I=\dfrac{V}{R}(1-e^{\dfrac{-R}{L}}t)](https://tex.z-dn.net/?f=I%3D%5Cdfrac%7BV%7D%7BR%7D%281-e%5E%7B%5Cdfrac%7B-R%7D%7BL%7D%7Dt%29)
Where, V = voltage
R = resistance
L = inductance
T = time
Put the value into the formula
![I=\dfrac{15}{60}(1-e^{\dfrac{-60}{45\times10^{3}}}\times7\times10^{-3})](https://tex.z-dn.net/?f=I%3D%5Cdfrac%7B15%7D%7B60%7D%281-e%5E%7B%5Cdfrac%7B-60%7D%7B45%5Ctimes10%5E%7B3%7D%7D%7D%5Ctimes7%5Ctimes10%5E%7B-3%7D%29)
![I=0.248\ A](https://tex.z-dn.net/?f=I%3D0.248%5C%20A)
Hence, The current is 0.248 A.