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zhenek [66]
4 years ago
13

Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of th

ese seeds can be determined with a high-speed camera. In an experiment on one type of plant, seeds are projected at 20 cm above ground level with initial speeds between 2.3 m/s and 4.6 m/s. The launch angle is measured from the horizontal, with + 90° corresponding to an initial velocity straight up and – 90° straight down.
The experiment is designed so that the seeds move no more than 0.20 mm between photographic frames. What minimum frame rate for the high-speed camera is needed to achieve this? (a) 250 frames/s; (b) 2500 frames/s; (c) 25,000 frames/s; (d) 250,000 frames/s.
Physics
1 answer:
Romashka [77]4 years ago
4 0

Answer:

trajectory

Explanation:

according to issac newton plants are important

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a stationary police officer directs radio waves emitted by a radar gun at a vehicle toward the officer. Compared to the emitted
Arisa [49]

Answer:

D) Higher Frequency

Explanation:

Higher frequency because it says a vehicle “towards” the officer

3 0
3 years ago
An object has a mechanical energy of 1575 J and a potential energy of 1265 J.
laila [671]

6.  

A. 1575 - 1265 = 310J

B.  KE 1/2 MV^2

   V=√2·KE/M = √2(310)/12   V = 7.2mls

C.  PE = 1265 = mgh

h= 1265/mg = 1265/(12)(92)    h= 10.8m    

7.  

A.  KE  = 1/2 mv^2  0.5(5)(12)^2    KE = 360J

B.  PE = mgh = (5)(9.8)(2.6)  PE = 127.4J

C.  ME = KE + PE = 360 + 127.4   ME = 487.4J

5 0
4 years ago
A physics professor that doesn’t get easily embarrassed stands at the center of a frictionless turntable with arms outstretched
mr Goodwill [35]
Apply conservation of angular momentum:
L = Iw = const.
L = angular momentum, I = moment of inertia, w = angular velocity, L must stay constant.

L must stay the same before and after the professor brings the dumbbells closer to himself.

His initial angular velocity is 2π radians divided by 2.0 seconds, or π rad/s. His initial moment of inertia is 3.0kg•m^2

His final moment of inertia is 2.2kg•m^2.

Calculate the initial angular velocity:
L = 3.0π

Final angular velocity:
L = 2.2w

Set the initial and final angular momentum equal to each other and solve for the final angular velocity w:

3.0π = 2.2w
w = 1.4π rad/s

The rotational energy is given by:
KE = 0.5Iw^2

Initial rotational energy:
KE = 0.5(3.0)(π)^2 = 14.8J

Final rotational energy:
KE = 0.5(2.2)(1.4)^2 = 21.3J

There is an increase in rotational energy. Where did this energy come from? It came from changing the moment of inertia. The professor had to exert a radially inward force to pull in the dumbbells, doing work that increases his rotational energy.
3 0
3 years ago
Read 2 more answers
A ball was thrown from a projectile building of 30m which moves at a constant velocity of 20m/s and has an angle of 30degrees to
qwelly [4]

Answer:

Time of flight = 4.08seconds

Horizontal component of initial velocity is 17.32m/s

Explanation: complete question( and the horizontal component of the initial velocity.)

The equation for time of flight of a projectile is given as T= 2u/g

T=( 2×20)/9.8

T= 40/9.8= 4.08seconds

Horizontal component of initial velocity Vix= Vi Costheta

Vix= 20× cos 30°

Vix= 20×0.8660

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6 0
3 years ago
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At atmospheric pressure, what is the characteristic boiling point of water,in degrees Celsius
Marina86 [1]
At standard atmospheric pressure, 100° C
is defined as the boiling point of water.
3 0
4 years ago
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