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2 years ago

Which planet has completed less than one orbit of the sun in the last 100 years?

Physics

2 answers:

ivolga24 [154]2 years ago

8 0

The best answer of this question is Neptune

(3) Neptune

OlgaM077 [116]2 years ago

6 0

Since Pluto is no longer considered a planet, the correct answer would be Neptune. It is eight and farthest known planet of the Solar system. Orbital period of planet Neptune is 168 years. So planet Neptune has completed less than one orbit around the Sun in the last 100 years.

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A physicist's right eye is presbyopic (i.e., farsighted). This eye can see clearly only beyond a distance of 97 cm, which makes

Ivan

Answer:

f = 19,877 cm and P = 5D

Explanation:

This is a lens focal length exercise, which must be solved with the optical constructor equation

1 / f = 1 / p + 1 / q

where f is the focal length, p is the distance to the object and q is the distance to the image.

In this case the object is placed p = 25 cm from the eye, to be able to see it clearly the image must be at q = 97 cm from the eye

let's calculate

1 / f = 1/97 + 1/25

1 / f = 0.05

f = 19,877 cm

the power of a lens is defined by the inverse of the focal length in meters

P = 1 / f

P = 1 / 19,877 10-2

P = 5D

5 0

2 years ago

A 3.00 kg cart on a frictionless track is pulled by a string so that it accelerates at 2.00 m/s/s. what is the tension in the st

AnnZ [28]

Maybe the picture helps. The blue block represents the cart with a mass of 3 kg. The person(black block) is pulling the cart to the right with a force F so that the acceleration a is 2 m/s². According to Newton's 2nd law: F = m*a.

5 0

2 years ago

Read 2 more answers

Championship swimmers take about 22 s and about 30 arm strokes to move through the water in a 50 m freestyle race.The swimmer's

Tasya [4]

Answer:

4400 Joules

73.33 Joules

25.9325 Joules

Explanation:

P = Power = 800 W

t = Time = 22 s

F = Force

r = Radius of arm = 90 cm

Energy

$E=P\times t\\\Rightarrow E=800\times 22\\\Rightarrow E=17600\ J$

As the efficiency is 25%

$E=0.25\times 17600\\\Rightarrow E=4400\ J$

Energy used in the race is 4400 Joules

Half of the energy is used in the arm

$E=\frac{4400}{2}=2200\ J$

So, per stroke of paddle

$E=\frac{2200}{30}=73.33\ J$

The energy expenditure per arm stroke is 73.33 Joules

Displacement will be the half of the perimeter of the circle

$s=\frac{1}{2}\times 2\pi r\\\Rightarrow s=\frac{1}{2}\times 2\pi 0.9\\\Rightarrow s=2.82743$

Work done

$W=F\times s\\\Rightarrow F=\frac{W}{s}\\\Rightarrow F=\frac{73.33}{2.82743}\\\Rightarrow W=25.9352\ J$

The average force of the hand on the water is 25.9325 Joules

3 0

2 years ago

A sled, which has a mass of m = 125 kg., is sitting on an icy horizontal surface. A rope is attached to the front end of the sle

zalisa [80]

Answer:

Explanation:

b ) Net force = mass x acceleration

= 125 x 3.3 = 412.5 N

Forward force ( horizontal component of F ) = 585 cos 28

= 516.5 N

Net force = forward force - friction

412.5 = 516.5 - friction

friction = 516.5 - 412.5 = 104 N .

c ) Nornal force = R

Total upward force = R + 585 sin28

= R + 274.64

For balancing

R + 274.64 = mg

R + 274.64 = 585 x 9.8 = 5733

R = 5458.36 N

d ) coefficient of sliding friction be μ

μ R = friction

μ x 5458.36 = 104

μ = .019

e )

Displacement in 5 sec

s = ut + 1/2 a t²

= 0 + .5 x 3.3 x 5²= 41.25 m .

5 0

2 years ago

Find the mass of a ball if it was thrown with a force of 18N and 2m/s2

salantis [7]

Answer: 9 Kg

Explanation:

Force = Mass x Accelaration

18 = Mass x 2

Mass = 18/2

Mass = 9 Kg

4 0

2 years ago