a device employing a lens, shutter, and persistent light source that projects images from glass slides onto a flat white wall or
2 answers:
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On ground weight of plane will be measured as its actual weight which will be given as
now when plane is in air its weight is measured as combined effect of earth gravitational force and buoyancy force both
so weight in air will be given as
here since net effect due to air is opposite to the direction of weight so in air the plane weight will be measure less than its weight on ground.
so answer will be
A)more than a plane in the air
Answer:
a) , b)
Explanation:
a) According to the Principle of Energy Conservation, the kinetic energy of the box is transformed into elastic potential energy.
The spring constant is:
b) The initial speed needed to compress the spring by 1.5 centimeters is:
Explanation:
According to the law of conservation of energy, work done by the force is as follows.
= 64.95 J
Now, gain in potential energy is as follows.
P.E = mgh
=
= 29.4 J
Gain in potential energy will be as follows.
=
=
= 11.25
As,
= 64.95 J - 29.4 - 11.25
= 24.3
v = 4.92 m/s
Therefore, we can conclude that relative velocity at point B is 4.92 m/s.