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Natalka [10]
3 years ago
5

Do sponges have of appendages jointed, not Jointed, or absent

Physics
1 answer:
anygoal [31]3 years ago
7 0
Sponges have appendages jointed 
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Using a force of 28.0 Newton, a student pulls a 70.0 Newton weight along the tabletop for a distance of 15.0 meters in 3.0 secon
Musya8 [376]

Answer:

140 watt

Explanation:

We are given that

Force applied by student ,F=28 N

Weight pulled  by students=70 N

Displacement,s=15 m

Time=3 s

We have to find the power developed  by the student.

Work done=w=F\times s

Work done by the student=28\times 15=420 J

Power=\frac{work\;done}{time}

Using the formula

Power=\frac{420}{3}=140watt

Hence, the power developed by the students=140 watt

8 0
2 years ago
Which statement accurately describes impulse?
KiRa [710]

Answer:

Impulse is related to momentum because impulse is a term that describes object's change in momentum. The measurable quantity of momentum changing is called impulse.

7 0
3 years ago
Read 2 more answers
An excited hydrogen atom releases an electromagnetic wave to return to its normal state. You use your futuristic dual electric/m
masya89 [10]

Answer: the magnetic wave will travel out of the screen.

Explanation:

Electric field direction is perpendicular to the magnetic field direction. Both are also perpendicular to the direction of the particles.

Using right hand rule to solve this problem,

This pointed finger depicts the electric field direction which the curly fingers depict the direction of the magnetic field. The pointed thumb will depict the direction in which the wave travel. Which is out of the screen.

8 0
3 years ago
a light wave travels from air into a medium of refractive index 1.54. If the wavelength of the light in air is 5.4 * 10^-7. calc
kozerog [31]

3.51 × 10^-7m

Explanation:

Refractive index = wavelength of the light in air ÷ wavelength in the medium

wavelength in the medium = wavelength of the light in air ÷ refractive index

= 5.4 * 10^-7 ÷ 1.54

= 3.51 × 10^-7m

3 0
2 years ago
As the earth rotates through one revolution, a person standing on the equator traces out a circular path whose radius is equal t
mrs_skeptik [129]

Answer:

The average speed will be "1038 mph".

Explanation:

Period for one revolution is:

T = 24 hours

  = 86,400 sec

x = c = 2πr

The given values is:

r = 6.38×10⁶ m

Now,

⇒  T=\frac{2 \pi r}{v}

Or,

⇒  v=\frac{2 \pi r}{T}

On substituting the values, we get

       =\frac{2 \pi (6.38\times 10^6)}{86,400}

       =464 \ min/sec

       =(464 \frac{min}{sec}) (\frac{3600 \ sec}{1 \ hour} )(\frac{1 \ mi}{1609 \ m} )

       =1038 \ mph

6 0
3 years ago
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