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11111nata11111 [884]
3 years ago
6

Which activity can substantially increase the activity level of a person's lifestyle? driving a car using an escalator washing d

ishes walking to school
Physics
2 answers:
VashaNatasha [74]3 years ago
5 0
Walking to school, hope this helps!
Fittoniya [83]3 years ago
5 0

Answer: walking to school

Physical activity refers to the movement of skeleton muscles which requires the expenditure of energy by the body. This involves daily movement or motion activities an human being perform in order to carry out a desired function. For example, walking to class, cleaning a house and mowing the lawn all these activities involves the movement of muscles. Exercise is also a physical activity which is required to be done to maintain the fitness of the body.

Walking to school will substantially increase the activity level of a person's lifestyle because it favors the movement of muscles and bones and ensures the entire body activity by the expenditure of energy. This will help in booting up of stamina and endurance. Therefore, will make a person physically fit to lead a healthy life style.

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A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.6 m/s at ground level.
galina1969 [7]

Answer:

44.64 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 4.2\times 1180+80.6^2}\\\Rightarrow v=128.01\ m/s

v=u+at\\\Rightarrow 128.01=80.6+4.2t\\\Rightarrow t=\frac{128.01-80.6}{4.2}=11.29\ s

<u>Time taken to reach 1180 m is 11.29 seconds</u>

v=u+at\\\Rightarrow 0=128.01-9.8t\\\Rightarrow t=\frac{128.01}{9.8}=13.06\ s

<u>Time the rocket will keep going up after the engines shut off is 13.06 seconds.</u>

v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{0^2-128.01^2}{2\times -9.8}\\\Rightarrow s=836.05\ m

The distance the rocket will keep going up after the engines shut off is 836.05 m

Total distance traveled by the rocket in the upward direction is 1180+836.05 = 2016.05 m

The rocket will fall from this height

s=ut+\frac{1}{2}at^2\\\Rightarrow 2016.05=0t+\frac{1}{2}\times 9.8\times t^2\\\Rightarrow t=\sqrt{\frac{2016.05\times 2}{9.8}}\\\Rightarrow t=20.29\ s

<u>Time taken by the rocket to fall from maximum height is 20.29 seconds</u>

Time the rocket will stay in the air is 11.29+13.06+20.29 = 44.64 seconds

5 0
3 years ago
Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg. A horizont
vfiekz [6]

Answer:

2.75 N

Explanation:

Given that,

Box A has a mass 21.0 kg and box B has a mass 8.0 kg.

A horizontal force of 100N is exerted on box A.

Let a be the acceleration of the system. Using second law of motion,

F=(m_A+m_B)a\\\\a=\dfrac{F}{(m_A+m_B)}\\\\a=\dfrac{10}{(21+8)}\\\\a=0.344\ m/s^2

Now applying Newton's second law to box B. So,

F_A=m_Ba\\\\=8\times 0.344\\\\=2.75\ N

So, 2.75 N is the force that box A exerts on box B.

8 0
3 years ago
If we measure the temperature of a blackbody to be about 300 K (a typical air temperature in Florida), at what wavelength would
Nostrana [21]

Answer:

9.66 x 10^-6 m

Explanation:

Use the Wein's displacement law

\lambda _{m}\times T = b

Where, b is the Wein's constant

b =  2.898 x 10^-3 meter-kelvin

So, λm x 300 =  2.898 x 10^-3

λm = 9.66 x 10^-6 m

3 0
4 years ago
WRONG ANSWERS WILL BE REPORTED
Dmitry_Shevchenko [17]
The answer to number 9 is C, decreased muscle tension. I believe number 10 is D, prepares an organism to respond to stress.
7 0
3 years ago
What’s the total system momentum before collision?
Soloha48 [4]
The momentum would be 9 kg
3 0
3 years ago
Read 2 more answers
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