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2 years ago

Will the velocity of the book change as it moves across the surface with NO friction? Explain your answer.

Physics

2 answers:

MakcuM [25]2 years ago

6 0

No velocity will not be changed

Why?

According to Newtons 1st law the velocity of a moving object remains unchanged unless a external force affect that.

nata0808 [166]2 years ago

6 0

No. IF the surface is level.

(Explanation withheld by request of the asker.)

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It is 5.5 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h

stealth61 [152]

Explanation:

Displacement = 5 km

Converting km/h to m/s,

10 km/h * 1000 m/1 km * 1 h/3600 s

= 25/9 m/s

Remember,

700 watt = 700 J/s

Velocity = displacement/time

Time = 5000/(25/9)

= 1800 s

Energy = power * time

= 700 * 1800

= 1,260,000

= 1260 kJ

Converting km/h to m/s,

3 km/h * 1000 m/1 km * 1 h/3600 s

= 5/6 m/s

290 watt = 290 J/s

Velocity = displacement/time

Time = 5000/(5/6)

= 6000 s

Energy = power * time

= 290 * 6000

= 1,740,000

= 1740 kJ

Walking burns more energy; 1,740,000 joules. It burns more because you walk for a greater period of time.

6 0

2 years ago

A force of 45 N is applied tangentially to the rim of a solid disk of radius 0.12 m. The disk rotates about an axis through its

bearhunter [10]

Answer:

Mass of the disk will be 2.976 kg

Explanation:

We have given force F = 45 N

Radius of the disk r = 0.12 m

Angular acceleration $\alpha =140rad/sec^2$

We know that torque $\tau =I\alpha$

And $\tau =Fr$

So $Fr=I\alpha$ , here I is moment of inertia

So $50\times 0.12=I\times 140$

$I=0.0428kgm^2$

We know that moment of inertia $I=\frac{1}{2}mr^2$

So $0.0428=\frac{1}{2}\times m\times 0.12^2$

m = 2.976 kg

6 0

2 years ago

if there are infinite universes is it possible that there is a universe where 1+1=3 or 4 or something

zhenek [66]

Answer:

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2 years ago

Which of the following are examples of energy being conserved? Choose all that apply A light bulb constantly changes electrical

Degger [83]

A plant collects sunlight to form glucose, and your friend proposes an idea for a fan. Conserved = saving

4 0

2 years ago

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True or false Weight is constant every place in the universe.

ycow [4]

False. it's depend on g -constant.

6 0

3 years ago