Write an expression that results in a String consisting of the third through tenth characters of the String s.

) A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the f

Yuri [45]

The frictional force required is 9000 N

Explanation:

In order to keep the car in the turn in circular motion without sliding, the frictional force must provide the centripetal force necessary for the circular motion.

Therefore, we can write:

$F_f = m \frac{v^2}{r}$

where the term on the left is the frictional force while the term on the right is the centripetal force, and where:

m is the mass of the car

v is its speed

r is the radius of the curve

For the car in this turn, we have

m = 1000 kg

v = 30 m/s

$r=\frac{0.20 km}{2}=0.10 km = 100 m$ (since the diameter is 0.20 km, the radius is half that value)

And substituting, we find

$F_f = (1000) \frac{30^2}{100}=9000 N$

Learn more about friction:

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8 0

4 years ago

What is the definition of a volt?

tatiyna

The standard unit of potential difference and electromotive force in the International System of Units(SI), formally defined to be the difference of electric potential between two points of a conductor carrying a constant current of one ampere, when the power dissipated between these points is equal to one watt.

3 0

3 years ago

1. The property of a material to absorb liquid like water is called

frez [133]

Answer:

A hygroscopic substance is one that readily attracts water from its surroundings, through either absorption or adsorption.

Explanation:

A hygroscopic substance is one that readily attracts water from its surroundings, through either absorption or adsorption.

3 0

3 years ago

A non-conducting sphere of radius R = 3.0 cm carries a charge Q = 2.0 mC distributed uniformly throughout its volume. At what di

OleMash [197]

To solve this problem we will use the concept of electric field, with which we will make the proportional comparison as we move away from the center. So we have the maximum electric field is given as,

$E_{max} = \frac{kQ}{R^2}$

Where,

Q = Charge

R = Radius

Electric field inside the sphere is given as,

$\frac{kQ}{R^2} = \frac{1}{2}\frac{kQ}{R^2}$

$R'=\sqrt{2}R$

$R' = 3\sqrt{2}$

$R' = 4.2cm$

Electric field outside the sphere is given as,

$\frac{kQ}{2R^2} = \frac{1}{2}\frac{kQ}{R^3}r$

$\frac{1}{2} = \frac{r'}{R}$

$\Rightarrow \frac{R}{2} = \frac{3}{2} = 1.5cm$

Therefore the possible values are 3.5cm and 9.9cm: The correct answer is D.

5 0

3 years ago

What is the reaction force if a girl pulls on a cow?

Papessa [141]

Answer : B) The cow pulls back on the girl.

From newton’s third law we know that every action has a reaction force pushing back. So when the girl pulls on a cow, the cow is pulling back on her.

8 0

4 years ago