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suter [353]
3 years ago
11

How much physical activity should an adult have each week?

Physics
1 answer:
sergiy2304 [10]3 years ago
8 0
I believe the correct answer is c
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41. Planet Ayanna has a radius of 6.2 X 10%m and orbits the star named Dayli in 98 days. A new neighboring planet Clayton J-21 h
romanna [79]

Answer:

138.3 days

Explanation:

Given that a Planet Ayanna has a radius of 6.2 X 10%m and orbits the star named Dayli in 98 days. A new neighboring planet Clayton J-21 has been discovered and has a radius of 7.8 X 10 meters.

The period of time for Clayton J-21 to orbit Dayli can be calculated by using Kepler law.

T^2 is proportional to r^3

That is,

T^2/r^3 = constant

98^2 / 62^3 = T^2 / 78^3

Make T^2 the subject of formula.

T^2 = 98^2 / 62^3 × 78^3

T^2 = 19123.2

T = sqrt ( 19123.2 )

T = 138.2867 days

Therefore, the period of time for Clayton J-21 to orbit Dayli is 138.3 days approximately.

4 0
3 years ago
The temperature of the air in a valley begins to increase after the sun comes up and heats the valley floor. What will
tester [92]

Explanation:

I think it will increase a little bit ... just image ... if the temperature is 0, the velocity will be 0 too. because the vibration of atom is so weak and the sound cant progation.

7 0
3 years ago
Squid use jet propulsion for rapid escapes. A squid pulls water into its body and then rapidly ejects the water backward to prop
Setler [38]

Answer:

a. FTh = 30 N

b. Fw = 30 N

c. a = 200 m/s2

Explanation:

See full explanation in the picture. Please rate as brainliest

5 0
3 years ago
A 15 kg object and a 18 kg object are connected by a massless compressed spring and
MatroZZZ [7]

Hi there!

This is an example of a recoil collision.

Using the conservation of momentum:

p_i = p_f

The initial momentum is 0 kgm/s (objects start from rest), so:

p_f = 0

We are given that the 15 kg block has a velocity of 12 m/s to the left, so:

m_1v_1' + m_2v_2' = 0 \\\\15(-12) + 18v_2' = 0 \\\\

Solve for v2':

18v_2' = 180 \\\\v_2' = \boxed{10 m/s}

5 0
3 years ago
When Earth pulls on an object, that object also pulls on Earth. The values of these two forces are . This phenomenon can be expl
algol13
The values of these two forces are equal. Your weight on Earth is equal to the Earth's weight on you. When you and the Earth fall toward each other, your acceleration is greater than the Earth's acceleration, because your mass is less than the Earth's mass.
5 0
4 years ago
Read 2 more answers
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