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2 years ago

Discuss how friction is reduced in oce skating

Physics

1 answer:

belka [17]2 years ago

7 0

Answer:

below

Explanation:

Ice melts, meaning it has a watery layer upon its surface. This allows things to be moving like they are on a liquid but it has the solidity of a solid. The thin metal of the ice skates also decrease the surface area meaning it exerts more force but in turn, it allows you to move faster and further reduces friction.

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A car and its passengers have a mass of 1200kg it is travelling at 12m/s.

Natali [406]

Answer:

<em>The increase of kinetic energy is 108,000 J</em>

Explanation:

<u>Kinetic Energy </u>

Is the energy an object has due to its state of motion. It's proportional to the square of the speed and the mass.

The equation for the kinetic energy is:

$\displaystyle K=\frac{1}{2}mv^2$

Where:

m = mass of the object

v = speed at which the object moves

The kinetic energy is expressed in Joules (J)

A car has a total mass of m=1,200 kg and travels at v1=12 m/s. Then it increases its speed at v2=18 m/s.

It's required to compute the increase of kinetic energy. We'll calculate both energies K1 and K2 and then subtract them.

$\displaystyle K_1=\frac{1}{2}1,200*12^2=86,400\ J$

$\displaystyle K_2=\frac{1}{2}1,200*18^2=194,400\ J$

The increase of kinetic energy is:

$\Delta K=K_2-K_1 =194,400\ J-86,400\ J$

$\Delta K=108,000\ J$

The increase of kinetic energy is 108,000 J

4 0

3 years ago

A circuit has a resistance of 4.0 Ohms. What voltage will produce a current of 1.4 Amps in the circuit

enyata [817]

Answer:

5.6 volts

Explanation:

According to Ohm's Law, V = IR

where V = voltage, I = Current and R = resistance

8 0

3 years ago

Which of the following is NOT a fundamental S.I unit? A. Meter B. Ampere C. Kelvin D. Radian

Llana [10]

Explanation:

D . Radian is not a fundamental S.I unit

7 0

3 years ago

One way to ensure that the race ends up in a tie is to have the person who lost the original race run a shorter distance before

Vikki [24]

Answer:

The appropriate answer is "72.8 m".

Explanation:

Let the distance be "x".

As per the question, we get

⇒ $T_{Mia}=T_{Brandi}$

or,

⇒ $\frac{x}{13} +\frac{x}{7}=\frac{\80}{10} +\frac{80}{10}$

By taking L.C.M, we get

⇒ $\frac{20x}{91}=16$

By applying cross-multiplication, we get

⇒ $20x=1440$

⇒ $x=\frac{1456}{20}$

⇒ $=72.8\ m$

6 0

3 years ago

An athlete wants to refill an old punching bag used for training, as shown in the picture. When refilled, the bag will rip if it

In-s [12.5K]

The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.

<h3>Newton's third law of motion</h3>

Newton's third law of motion states action and reaction are equal and opposite. That is the force applied to an object is equal in magnitude to force experienced by the object but in opposite direction.

From the given question, when the bag exert a certain on the athlete, the athlete also exerts similar force to the bag but in opposite direction.

Thus, the complete sentence is as follows;

The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.

Learn more about Newton's third law of motion here: brainly.com/question/25998091

#SPJ1

5 0

2 years ago