Answer:
Phase contrast microscope
Explanation:
It is used for viewing biological structures not visible under the microscope. It is used for viewing microrganisms live
consider the motion in x-direction
= initial velocity in x-direction = ?
X = horizontal distance traveled = 100 m
= acceleration along x-direction = 0 m/s²
t = time of travel = 4.60 sec
Using the equation
X =
t + (0.5)
t²
100 =
(4.60)
= 21.7 m/s
consider the motion along y-direction
= initial velocity in y-direction = ?
Y = vertical displacement = 0 m
= acceleration along x-direction = - 9.8 m/s²
t = time of travel = 4.60 sec
Using the equation
Y =
t + (0.5)
t²
0 =
(4.60) + (0.5) (- 9.8) (4.60)²
= 22.54 m/s
initial velocity is given as
= sqrt((
)² + (
)²)
= sqrt((21.7)² + (22.54)²) = 31.3 m/s
direction: θ = tan⁻¹(22.54/21.7) = 46.12 deg
The horizontal component of the tension in the string is a centripetal force, so by Newton's second law we have
• net horizontal force

where
,
, and
is the radius of the circular path.
As shown in the diagram, we can see that

where
, so that

The vertical component of the tension counters the weight of the mass and keeps it in the same plane, so that by Newton's second law we have
• net vertical force

Solve for
:

Complete the square:

Plugging in the known quantities, we end up with

The second case has no real solution, since
for all
. This leaves us with
