When Emma pushes a bag with a force of 27 newtons, the coefficient of kinetic friction between the bag and the floor is 0.23. What is the normal force acting on the bag by the floor?

Answers

Answer 1

Answer: Normal force(N) is always equal and opposite to the weight.
The floor is exerting an upward force upon the bag in order to support the weight of the bag.
Friction force is proportional to the normal force:
f = k * N
In this case: f=27 N, k=0.23
27 N = 0.23 * N
N= 27 N : 0.23 = 117.39 N

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How do you change Newtons into kilograms

Answers

You don't. You can only convert units when they're both units of the
same physical quantity. In this case, 'newton' is a unit of force, but
'kilogram' is a unit of mass. Those are not the same physical quantity,
so they don't convert.

The closest you can get is to find the weight of some mass when you know
the gravity in the place where the mass is. The weight of some mass is

(mass in kilograms) x (gravity in meters per second²)

and the answer is in newtons.

On Earth, the gravity is 9.8 meters per second², so each kilogram of mass
weighs 9.8 newtons.

In other places, like on the moon or on Mars, the gravity is different, so
a kilogram weighs something different.

Will an object with a density of 1.05 g/ml float or sink in water? Explain

Answers

The object will sink, because it is more dense than water.

Let's see this in detail. There are two forces acting on the object:

- its weight, which points downward, given by

$W=mg=\rho_o V_o g$

where $\rho_o$ is the object's density, $V_o$ is its volume, and g is the gravitational acceleration.

- The buoyancy force, which points upward, given by

$B=\rho_w V_w g$

where $\rho_w$ is the water density, $V_w$ is the volume of water displaced by the object.

We see that it is always $W>B$ , so the object will sink. In fact:

$\rho_o > \rho_w$ . We are told the object's density is 1.05 g/mL, while the water density is 1.00 g/mL.

$V_o \geq V_w$ : the two volumes are equal when the object is completely submersed, and the volume of water displaced cannot be greater than the volume of the object.

So, W > B, and the object will sink.

The density of water is very close to 1.0 gm/ml.
The object is more dense than water.
It will sink in water.

Erica needed to practice dribbling the ball up and down the length of the court. She divided to do it 10 times. How far did she dribble?

Answers

Answer:

Explanation:

what is the length of the court. you need the length to answer the question

The phase change in which a substance changes from a gas directly to a solid isA. condensation.
B. vaporization.
C. deposition.
D. sublimation.

Answers

Condensation is the change ofthe substance from liquid to solid phase. Example of this is the formation ofice. Vaporization is the change of substance from liquid to gas phase. Example ofthis is the boiling of water. Deposition is the change of a substance from gasto solid phase. Example of this is the formation of ice on a winter day. Sublimationis the change of a substance from solid to gas phase. Example of this is dryice. The answer is letter C.

Answer: Properties and States of Matter Practice

1. Which of the following are pure substances? Compounds

2. A substance that cannot be broken into similar substances is called a(n)... Element

3. When a physical change in a sample occurs, which of the following does NOT change? Composition

4. Which of the following will cause a decrease in gas pressure in a closed container? Lowering the temperature

5. The heat of fusion for water is the amount of energy needed for water to... Melt

6. The phase change in which a substance changes from a gas directly to a solid is... Deposition

7. Which of the following phase changes is an exothermic change? sublimation

8. Which of the following has the highest viscosity? Corn Syrup

9. In which of the substances in the figure below are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions? It is the one where the particles are more apart.

Explanation:

Two aircraft leave an airfield at the same time. One travels due south at an average velocity of 85 m s 1and the second travels due east at an average velocity of 71 ms −1
. Calculate the distance between the planes after 6 hours. Give your answer in km, to the nearest km. km

Answers

Answer: 2392 kilometers.

Explanation:

To find the distance between the two aircraft after 6 hours, we can use the Pythagorean theorem because they are moving at right angles to each other (one due south and the other due east). Here's how to calculate it:

First, calculate the distance traveled by each aircraft in 6 hours.

1. Aircraft traveling south:

Distance = Velocity × Time

Distance = 85 m/s × (6 hours × 3600 seconds/hour)

Distance = 85 m/s × 21600 s

Distance = 1836000 meters

2. Aircraft traveling east:

Distance = Velocity × Time

Distance = 71 m/s × (6 hours × 3600 seconds/hour)

Distance = 71 m/s × 21600 s

Distance = 1533600 meters

Now, we have the two sides of a right triangle:

- The southbound distance is 1836000 meters.

- The eastbound distance is 1533600 meters.

We can use the Pythagorean theorem to find the hypotenuse (distance between the aircraft):

Distance = √(southbound distance² + eastbound distance²)

Distance = √((1836000 m)² + (1533600 m)²)

Distance ≈ √(3376416000000 m² + 2352089600000 m²)

Distance ≈ √(5728505600000 m²)

Distance ≈ 2391760.78 meters

Now, let's convert the distance to kilometers:

Distance ≈ 2391.76 kilometers

Rounding to the nearest kilometer, the distance between the two aircraft after 6 hours is approximately 2392 kilometers.

A kettle transfers 1500 J of energy, 1200 J to a thermal energy store and 300 J to a vibrational energy store (sound). How efficient is the kettle?

Answers

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Final answer:

To calculate the efficiency of the kettle, divide the useful output energy (1200 J) by the total input energy (1500 J) and multiply by 100%. This results in an efficiency of 80%, meaning 80% of the energy was converted into useful thermal energy.

Explanation:

In order to find the efficiency of the kettle, we need to compute the ratio of the useful output energy to the total input energy and then multiply by 100% to convert the decimal to a percentage. In this case, the useful output energy is the 1200 J transferred to the thermal energy store. The total input energy is the total energy transferred by the kettle which is 1500 J. So, the efficiency of the kettle is (1200 J / 1500 J) * 100% = 80%.

The remaining 20% energy is wasted and was transferred to the vibrational (sound) energy store, which is a non-useful energy output. An efficient appliance is one which converts a higher proportion of the input energy into useful output energy, with less of it wasted. In this case, 80% of the energy from the kettle was converted into useful thermal energy, hence the kettle is quite efficient.

Learn more about Efficiency here:

brainly.com/question/33283760

#SPJ3

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