All categories

3 years ago

Children and adolescents should do ____ hour or more of physical activity every day.

2 answers:

8 0

Hello there!

Children and adolescents should do 1 hour or more of physical activity every day. This is great for them and helps them stay healthy and always moving.

Your correct answer would be (last option) <=====

A 5

B 7

C 3

D 1

I hope this helps you!

Lelechka [254]3 years ago

6 0

The answer is D. 1

Hope I helped!

Let me know if you need anything else!

~ Zoe

You might be interested in

Help on finding kinetic energy??

Jobisdone [24]

Trick question? In order to have kinetic energy, an object must be moving. Therefore, in this case, kinetic energy would be 0. If it were asking about potential energy, it would be a different story.

8 0

2 years ago

Read 2 more answers

Rephrase the law of universal gravitation

IRISSAK [1]

The law of universal gravitation says that one object attracts every other object using a proportional force to the mass of the object.

5 0

3 years ago

A uniform disk of mass M = 4.9 kg has a radius of 0.12 m and is pivoted so that it rotates freely about its axis. A string wrapp

AlekseyPX

Answer:

(A) 2.4 N-m

(B) $0.035kgm^2$

(D) 1741.13 J

(E) 725.481 rad

Explanation:

We have given mass of the disk m = 4.9 kg

Radius r = 0.12 m, that is distance = 0.12 m

Force F = 20 N

(a) Torque is equal to product of force and distance

So torque $\tau =Fr$ , here F is force and r is distance

So $\tau =20\times 0.12=2.4Nm$

(B) Moment of inertia is equal to $I=\frac{1}{2}mr^2$

So $I=\frac{1}{2}\times 4.9\times 0.12^2=0.035kgm^2$

Torque is equal to $\tau =I\alpha$

So angular acceleration $\alpha =\frac{\tau }{I}=\frac{2.4}{0.035}=68.571rad/sec^2$

So initial angular speed $\omega _{0}=0rad/sec$

Time t = 4.6 sec

From first equation of motion we know that $\omega =\omega _0+\alpha t$

So $\omega =0+68.571\times 4.6=315.426rad/sec$

(D) Kinetic energy is equal to $KE=\frac{1}{2}I\omega ^2=\frac{1}{2}\times 0.035\times 315.426^2=1741.13J$

(E) From second equation of motion

$\Theta =\omega _0t+\frac{1}{2}\alpha t^2=0\times 4.6+\frac{1}{2}\times 68.571\times 4.6^2=725.481rad$

3 0

3 years ago

Match the choices below to the correct description. Drag the terms on the left to the appropriate blanks on the right. ResetHelp

Andreas93 [3]

Answer: hello the terms are missing but I have provided the answer ( the terms and matched them properly

answer :

P WAVES
S WAVES
L WAVES
R WAVES

Explanation:

This body wave is a compressional wave : P WAVES

This body wave is a shear wave : S WAVES

This surface wave moves from side to side : L WAVES

This surface wave moves up and down. : R WAVES

A body wave is a type of wave that passes through the interior of the earth and they are classified as ; P and S waves while surface waves are seismic waves that travel near the earth's surface

5 0

3 years ago

Bryce has selected a major in political science but has a little interest in understanding public relations

Dominik [7]

Hi, you've asked an incomplete question. However, I assumed you want additional comments about this scenario.

Explanation:

Note, the term Major as used in academic contexts refers to a person's preferred interest or specialization at college or university.

Hence, the statement about Bryce appears to be contradictory, since we are told he "has little interest in understanding public relations".

8 0

2 years ago