When you sketch the problem, it would look like that shown in the picture. The velocity the airplane should achieve must be 120 km/h in order for it to lift off the ground and take-off. Before this, it has to build up speed in order to reach the final velocity from rest. In rectilinear motion, one of the useful equations used is
2ax = vf² - vi²
For consistency, let's convert km/h to m/s.
120 km/h * (1000 m/1 km) * (1 h/3600 s) = 33.33 m/s
Substituting the values,
2a(280 m) = (33.33 m/s)² - 0²
a = 1.984 m/s
The minimum acceleration is 1.984 m/s.
<span>Answer:
The spring force at A and B can be obtained
directly by summing moments_aJx)ut points B and A. respectively.
(+ IM, = 0; F A (1)- 392.4(3) =0 F A = 1 177.2 N
C+ 1M a = 0; F, (1) -392.4(4) = 0 F, = 1569.6 N
Spring Formula : Applying A = - , we have
Inn I S ,
A a = - 1 . 177 ' -- = 0.07*48 m A, = 156 ~ = 0. 10464 ra
x 15(103) 15(103)
Geometry : The angle of tilt a is
a - tan' 1 ^
0.10464 + 0.07848
1
10.4°
v * F
Z te</span>
Answer:
1. direct current 2. induction 3. conduction
Explanation:
When we walk barefoot on a carpet there is friction between the carpet surface and the lower surface of the feet which results in the exchange of charges between the two surfaces. During this course the carpet loses electron to the surface of the foot. Now, the charge on the carpet is static because it is an insulator but a human body being a good conductor of electricity has mobility of the charges.(3)
These mobile charges on the surface of a human body spread and look for a path of dissipation to a reservoir. When we bring our hand near a metal it induces an opposite charge near the surface of the metal,(2) this happens within a fraction of seconds. Now there is a positive charge on the nearest point on the metal and the negative charge on its farthest end is induced according to the conservation of charges.
As soon as the hand touches the metal (1)there is a transfer of charge from our body to the metal generating a very small shock. This happens only if we continue to stand on an insulated surface due to which the charge doesn't gets transferred to the ground.
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Answer:
According to Hook's law, we know,
strain/stress =Constant
Explanation: So, the ratio between stress and strain is always constant.
So, if stress is increased, then strain changes in that way so that this ratio always remains constant.
