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tensa zangetsu [6.8K]
2 years ago
7

Which statement about bout waves is correct?

Physics
1 answer:
Eva8 [605]2 years ago
6 0

Answer:

In light waves, the electromagnetic fields oscillate perpendicular to the direction of propagation. Hence, sound waves are longitudinal waves whereas light waves are transverse waves.

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What conventions are used in SI to indicate units
klemol [59]

Answer:

<u>Conventions used in SI to indicate units are as follows:</u>

  • Only singular form of units are used. for example: use kg and not kgs.
  • Do not use full stop after the abbreviations of any unit. for example: do not use kg. or cm.
  • Use one space between last numeric digit and SI unit. for example: 10 cm, 9 km.
  • Symbols and words should not be mixed. for example: use Kilogram per cubic and not kilogram/m3.
  • While writing numerals, only the symbols of the units should be written. for example: use 10 cm and not Ten cm.
  • Units named after a scientist should be written in small letters. for example: newton, henry.
  • Degree sign should not be used when the kelvin unit is used. for exmaple: use 37° and not 37°k

5 0
3 years ago
A horizontal force of 350N is exerted on a 2.5 kg ball as it rotates uniformly in a horizontal circle of radius of 0.90m. Calcul
harkovskaia [24]
F=mv^2/R
----> V^2=FR/m=(350x0.9)/2.5=126
----- V=11.22 m/s
5 0
3 years ago
Need help with #6. The digestive system Section Review.
uysha [10]
1)Food is crushed and ground in the mouth by teeth 
2)Chewed food is pushed into the pharynx 
3)Food enters the esophagus 
4)Food passes through a valve and into the stomach 
5)Food is broken down by pancreatic enzymes and absorbed by the small intestine 
6)Undigested material is pushed into the large intestine 
7)Waste material is compressed in the rectum and eliminated through the anus 
5 0
3 years ago
A tennis player smashes a ball of mass m horizontally at a vertical wall. The ball rebounds at the same speed v with which it st
Morgarella [4.7K]

Answer:

<em> B.0</em>

Explanation:

Change in momentum: This is defined as the product of mass and change in velocity of a body. or it can be defined as the product of force and time of a body. The fundamental unit of change in momentum is kg.m/s

Change in momentum = M(V-U)......................... Equation 1

where M = mass of the ball, V = final velocity of the ball, U = initial velocity of the ball.

Let: M = m kg and V = U = v m/s

Substituting these values into equation 1

Change in momentum = m(v-v)

Change in momentum = m(0)

Change in momentum = 0 kg.m/s

<em>Therefore the momentum of the ball has not changed.</em>

<em>The right option is B.0</em>

5 0
3 years ago
A Person whose weight is 5.20 x 10^2 N is being pulledup
Gnoma [55]

Answer:

Explanation:

Given

Weight of Person W=5.20\times 10^{2} N

Cave is h=35.1 m deep

Breaking stress T=569 N

Net Force on Person

F_{net}=569-520=49 N

a_{net}=\frac{F_{net}}{\frac{W}{g}}

a_{net}=\frac{49}{\frac{520}{9.8}}

a_{net}=0.923 m/s^2

The shortest time such that the person can be taken out of cave

h=ut+\frac{1}{2}at^2

where

h=distance moved

t=time

a=acceleration

35.1=0+\frac{1}{2}(0.923)(t)^2

t^2=76.05

t=\sqrt{76.05}

t=8.72\ s                    

6 0
2 years ago
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