The correct choice is ~ A
Bikes don't require gasoline for their functioning, so it causes less air pollution.
You stand on a spring scale on the floor of an elevator. The scale shows the highest reading when the elevator
1 answer:
Answer:
2. moves upward with increasing speed.
Explanation:
When an object it going up in an elevator, the object experiences the upward acceleration as well as the acceleration due to gravity. This means that the object feels that they are being pushed down.
Hence, the scale shows highest reading when the elevator moves upward with increasing speed.
The force on the scale would be
Where,
m = Mass of object
g = Acceleration due to gravity = 9.81 m/s²
a = Acceleration of the elevator
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Length of the pipe = 0.39 m
Number of harmonics = 3
Now there are 3 loops so here we can say
now here at the center of the pipe it will form Node
we need to find the distance of nearest antinode
So distance between node and its nearest antinode will be
So the distance will be 6.5 cm
Answer:
2.47 m
Explanation:
Let's calculate first the time it takes for the ball to cover the horizontal distance that separates the starting point from the crossbar of d = 52 m.
The horizontal velocity of the ball is constant:
and the time taken to cover the horizontal distance d is
So this is the time the ball takes to reach the horizontal position of the crossbar.
The vertical position of the ball at time t is given by
where
is the initial vertical velocity
g = 9.8 m/s^2 is the acceleration of gravity
And substituting t = 2.56 s, we find the vertical position of the ball when it is above the crossbar:
The height of the crossbar is h = 3.05 m, so the ball passes
above the crossbar.