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ikadub [295]
3 years ago
13

Therefore an answer in U.S. customary units, such as miles per hour would not be accepted as correct. A car traveling with const

ant speed travels 150 kmkm in 7200 ss. What is the speed of the car
Physics
2 answers:
allochka39001 [22]3 years ago
6 0

Answer:

The speed of the car is 20.84 m/s.

Explanation:

Given that,

The distance covered by the car, d = 150 km

Time, t = 7200 s

We need to find the speed of the car. We know that the speed of an object is given by total distance divided by total time taken. Mathematically,

v=\dfrac{d}{t}\\\\v=\dfrac{150\times 10^3\ m}{7200\ s}\\\\v=20.84\ m/s

So, the speed of the car is 20.84 m/s.

pychu [463]3 years ago
3 0

Answer:

calculate it. its not cheating, its like flash cards but better, besides its made for that reason.;)

Explanation:

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b

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3 years ago
A heavy solid disk rotating freely and slowed only by friction applied at its outer edge takes 120 seconds to come to a stop.
alisha [4.7K]

Answer:

The time is 16 min.

Explanation:

Given that,

Time = 120 sec

We need to calculate the moment of inertia

Using formula of moment of inertia

I=\dfrac{1}{2}MR^2

If the disk had twice the radius and twice the mass

The new moment of inertia

I'=\dfrac{1}{2}\times2M\times(2R)^2

I'=8I

We know,

The torque is

\tau=F\times R

We need to calculate the initial rotation acceleration

Using formula of acceleration

\alpha=\dfrac{\tau}{I}

Put the value in to the formula

\alpha=\dfrac{F\times R}{\dfrac{1}{2}MR^2}

\alpha=\dfrac{2F}{MR}

We need to calculate the new rotation acceleration

Using formula of acceleration

\alpha'=\dfrac{\tau}{I'}

Put the value in to the formula

\alpha=\dfrac{F\times R}{8\times\dfrac{1}{2}MR^2}

\alpha=\dfrac{2F}{8MR}

\alpha=\dfrac{\alpha}{8}

Rotation speed is same.

We need to calculate the time

Using formula angular velocity

\Omega=\omega'

\alpha\time t=\alpha'\times t'

Put the value into the formula

\alpha\times120=\dfrac{\alpha}{8}\times t'

t'=960\ sec

t'=16\ min

Hence, The time is 16 min.

5 0
3 years ago
What does Newton's third law describe?<br> What does Newton's third law describe?
defon

Explanation:

<em>Sir Isaac Newton's third law of motion</em> says that every action has an equal and opposite reaction.

For example, when you fire a gun, the gun exerts a force on bullet. Even the bullet exerts an equal force on the gun, causing it to recoil.

The Earth revolves around the Sun as the Sun attracts it. The reason why Earth doesn't fall into it is because the Earth also attracts the Sun with an equal gravitational force.

4 0
3 years ago
Why do these two magnets attract each other?
Liono4ka [1.6K]

Answer:

A

Explanation:

When two magnets are brought near each other, like poles repel; opposite poles attract. We like to represent this force effect of a magnet on iron-like objects with a concept called magnetic field. The concept of field can be best understood if we remember the gravitational force of Earth on object near it.

5 0
3 years ago
Read 2 more answers
Describe the relationship between a moving object's mass and its kinetic energy.
Paladinen [302]

Answer:

E=\dfrac{1}{2}mv^2

Explanation:

If m is the mass of the object and v is the velocity of the object. The kinetic energy is due to the motion of an object. It is given by the relation as follows :

E=\dfrac{1}{2}mv^2

The above formula is used to find the kinetic energy of an object.

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