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kobusy [5.1K]
3 years ago
7

A 63 kg ice skater finishes her performance and crossed the finish line with a speed of 10.8 m/s.

Physics
1 answer:
Mars2501 [29]3 years ago
4 0

Answer:

10.1 m/s

Explanation:

Every moving body or an object has a momentum. The simplest way to calculate it is to multiply the mass of an object with its velocity (p = m•v). So, just after this ice skater finished her performance, her momentum was 63 kg•10.8 m/s which equals to 680.4 kg•m/s. Then, she was given a huge bouquet which changed her total mass and speed. The thing we need to know is that the momentum before receiving the bouqet and after that are the same. With the bouqet, the mass increased and now is 63 kg + 4.4 kg = 67.4 kg. If p=m•v, then v=p/m, so her new speed is 680.4/67.4 = 10.0949, or approximately 10.1 m/s.

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Answer: acceleration is equal to the change in velocity per unit time in seconds.

a= ∆v / t = vf - vi / t

Explanation: change in velocity or ∆v can be expressed as (vf - vi)

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Describe how Rutherford's experiments changed the accepted scientific model of the atom.
lorasvet [3.4K]

Rutherford's model of the atom (ESAAQ) Rutherford carried out some experiments which led to a change in ideas around the atom. His new model described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.

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3 years ago
How can an object overcome static friction?
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Applying enough force in one direction to move the object, making kinetic energy.

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3 years ago
2. Three super strong teenagers pull a heavy crate across the floor. Dion pulls with a force of 18.5 N towards 0°. Shirley pulls
kogti [31]

Answer:

A) The resultant force is 43.4 [N]

B) The movement of the heavy crate is going to the right and in the negative direction on the y-axis

Explanation:

We need to make a sketch of the different forces acting on the heavy crate.

In the attached image we can see the forces and the sum of the vector with their respective angles.

Forces in the X-axis

Fdionx=18.5N\\\\Fshix=16.5*cos(30)=14.29N\\Fjoanx=19.5*cos(60)=9.75N\\\\Forcex= 18.5 + 14.29 + 9.75 = 42.54 N

Forces in the y-axis

FDiony=0[N]\\Fshirley= 16.5*sin(30)=8.25[N]\\Fjoany=19.5*sin(60)=16.88 [N]\\\\Forcesy=0+8.25-16.88= -8.63[N]

Using the Pythagorean theorem

Tforce=\sqrt{(42.54)^{2} +(8.63)^{2} } \\\\Tforce= 43.4N

The movement of the heavy crate is going to the right and in the negative direction on the y-axis, this can be easily seen in the graphical sum of vectors.

8 0
3 years ago
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The material that is more closely related to the Styrofoam insulator.

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Keeping something warm includes the stopping of the transfer of heat from one object to another. This is how insulation works.

Styrofoam is an insulator, which means it'll help keep the heat from the environment out of your cooler. However, you'll still need cooling agents (like ice packs) to make the cooler cold in the first place.

Styrofoam is usually made mostly of air, which means it is a poor conductor of heat, but an excellent convector. It traps the air in small pockets, which blocks the flow of heat energy. This reduces both conduction and convection and makes Styrofoam a good insulator.

To learn more about Styrofoam here

brainly.com/question/21369568

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8 0
2 years ago
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