a rock has mass 1.80 kg. when the rock is suspended from the lower end of a string and totally immersed in water, the tension in the string is 12.8 n. what is the smallest density of a liquid in which the rock will float?

Speed is the ratio of distance to time in which distance was covered. Hence to determine a journey, which means to determine a distance a person has travelled, one uses speed/time graph and not velocity/ time graph.

The velocity/time graph represents the change in velocity with respect to time. In this graph time is taken across the x axis and velocity is taken across the y axis. Then the slope of the velocity time graph reveals acceleration of the object.

The speed/time graph represents the motion of the object with respect to time. It determines the motion of the object at rest, with constant speed as well as with changing speed. Thus a speed/time graph is more useful to determine the journey of the person.

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Answer:

Explanation:

For A to become positively charged, a + charge must transfer from B to A.

The charge that must transfer for object A to become positively charged is the negative charge in object A.

Charging by conduction occurs when a charged object causes the flow of electron when it comes in contact with an uncharged object.

An object can either be negatively or positively charged. An object is said to be positively charged when it contains more protons than electron.

Therefore, for object A to be positively charged, the charge that must transfer for object A to become positively charged is the negative charge.

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we can state that Sekazi's displacement while learning to ride a bike without training wheels is 22.5 meters.

To find Sekazi's displacement, we can break down the problem into two parts: the time Sekazi's father pushes him and the time Sekazi continues on his own.
First, let's calculate the displacement when Sekazi's father pushes him.

We know that the acceleration is constant at 0.50 m/s² for 6.0 seconds. To find the displacement during this time, we can use the equation:
displacement = (initial velocity × time) + (0.5 × acceleration × time²)

Since Sekazi starts from rest, the initial velocity is 0 m/s. Plugging in the values, we get:

displacement = (0 × 6.0) + (0.5 × 0.50 × 6.0²)
displacement = 0 + (0.5 × 0.50 × 36.0)
displacement = 0 + (0.5 × 0.25 × 36.0)
displacement = 0 + (0.125 × 36.0)
displacement = 0 + 4.5
displacement = 4.5 meters

Now, let's calculate the displacement when Sekazi continues on his own at a constant velocity of 3.0 m/s for 6.0 seconds. Since the velocity is constant, the acceleration is 0. Using the equation:

displacement = (initial velocity × time) + (0.5 × acceleration × time²)

We know that Sekazi's initial velocity is 3.0 m/s and the time is 6.0 seconds. Plugging in the values, we get:

displacement = (3.0 × 6.0) + (0.5 × 0 × 6.0²)
displacement = 18.0 + (0 × 36.0)
displacement = 18.0 + 0
displacement = 18.0 meters

To find the total displacement, we add the displacement when Sekazi's father pushes him (4.5 meters) to the displacement when Sekazi continues on his own (18.0 meters):

total displacement = 4.5 + 18.0
total displacement = 22.5 meters

Therefore, Sekazi's displacement is 22.5 meters.

With the proper conclusion, we can state that Sekazi's displacement while learning to ride a bike without training wheels is 22.5 meters.

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Answer: 17 hours

Explanation:

Answer:

Yes, the acceleration at that time is also zero because the velocity is zero.

Explanation:

To answer the question given above, we shall determine the acceleration of the car at time 't' when the velocity is zero.

From the question given above, the following data were obtained:

Velocity (v) = 0 m/s

Time (t) = t

Acceleration (a) =?

Acceleration is defined as:

Acceleration (a) = Velocity (v) / time (t)

a = v/t

a = 0/t

a = 0

From the above illustration, we can see that the acceleration is zero irrespective of the time 't'.

Therefore, the acceleration of the car will be zero since the velocity of the car at time 't' is zero.

Answer:

Explanation:

the answer is gallons because i got it right on the exam

At the coordinates (2, 4), the unit vector (I + 4j)/17 is parallel to the line tangent to the parabola

y = x2.

The resultant vector of A and B is the sum of vectors A and B. Hence this is the unit vector parallel to the resultant vector AB

Vectors with a magnitude of exactly one unit are known as unit vectors. For a variety of reasons, they are really helpful. Specifically, any other vector can be formed by combining the unit vectors [0,1] and [1,0].

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Answer:

No

Explanation:

Only a few of alpha beta and gamma radiation can treat cancer

If the flywheel's rotational velocity is constant and the force applied by the ant is strong enough, the ant will adhere to the wheel's rim without slipping.

In this case, the ant's tangential velocity will be the same as the wheel's tangential velocity, and the centripetal force acting on the ant will be supplied by the frictional force.Using F = ma, we know that a = v^2/r. We can then substitute the value for the angular velocity and wheel radius to get the centripetal acceleration.

The centripetal force on the ant is m*ac. This centripetal force is supplied by the ant's grip on the wheel. Since the ant can hold on to the wheel with a force much greater than its own weight, it is safe to assume that the force of the grip is greater than the centripetal force.

In conclusion, the force with which the ant must hold on to stay on the wheel at point III is equal to the centripetal force exerted on it, which is equal to its mass multiplied by its centripetal acceleration, which is equal to m*v^2/r.

The mass of the ant is given as 1 gram (0.001 kg), and the radius of the wheel is given as 0.4 m. The linear velocity v can be calculated using the formula v = ωr. Therefore, the force required to keep the ant on the wheel at point III is:F = m*v^2/rF = 0.001*[(2*2*3.14*0.4)^2]/0.4F = 9.92 N (approximately)

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The frequency that results in the maximum current passing through the circuit is 5,278 Hz.

The resonance frequency of a series RLC circuit is given by:

f = 1 / (2π√(LC))

f = 1 / (2π√(LC))

f = 1 / (2π√(130 x \(10^{-3}\) x 7 x \(10^{-6}\)))

f = 1 / (2π√(0.910 x \(10^{-9}\)))

f = 1 / (2π x 0.00003018)

f = 5,278 Hz

An RLC circuit is an electrical circuit that consists of a resistor (R), an inductor (L), and a capacitor (C) connected in series or parallel. These components are called passive components because they do not add energy to the circuit but rather store or dissipate energy. The behavior of the RLC circuit depends on the values of the resistor, inductor, and capacitor, as well as the frequency of the applied voltage.

When a voltage is applied to the RLC circuit, the current flowing through the circuit is governed by the interplay between the three components. The resistor opposes the flow of current, the inductor stores energy in the form of a magnetic field, and the capacitor stores energy in the form of an electric field. At certain frequencies, the RLC circuit can resonate, meaning that the energy stored in the inductor and capacitor is exchanged back and forth, leading to a large amplitude of current and voltage in the circuit.

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D. The wagon moves because you apply more force to the wagon than it applies to you.

You apply force to a waggon when you push it. Newton's third law of motion states that you will experience an equal and opposite force from the waggon. The waggon moves, though, since the force you exert on it is larger than the force it exerts on you. This is so because the definition of force is the sum of mass and acceleration. Because the waggon is heavier than you are, it needs more energy to accelerate. You can use more effort when pushing the cart since you are lighter and can accelerate more readily.

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Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

Answer:

F = 9/5 C + 32     conversion from C to F

F = 9/5 * F/5 + 32

25 F = 9 F + 800

16 F = 800

F = 50  

Check:

C = 5/9 ( F - 32)  = 5/9 (50 - 32) = 10  as requested

Q = c m change in temp

Q = 1 cal/gm-deg C * 500 gm * 45 deg C = 22,500 calories

50 Fahrenheit heat required.

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy  between physical systems.

F = 9/5 C + 32     conversion from C to F

F = 9/5 * F/5 + 32

25 F = 9 F + 800

16 F = 800

F = 50

The answer is 50 Fahrenheit.

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Answer:

SL. Special Linear (mathematics)

Bobby is more powerful because he runs up the stairs faster.

Power is known to be the speed at which work is done. P = gravimetric power The SI unit is Watt W, where 1 Watt equals 1 Joule/second (1W=1J/s). Since work is energy transfer, power is also the rate at which energy is consumed. For example, a 60 W light bulb consumes 60 J of energy per second.

W = F × s

Where, W = work done

F = Force

s = distance

Since both of them are of same weight and can exert equal force while running and are covering same distance, their work done will be equal.

Now according to, P = W/T

Where, P = Power

W = Work

T = Time

Hence, power is inversely proportional to time.

Lesser the time for a particular work higher will be the power.

Time taken by Bobby to reach the bleachers = 30s

Time taken by Michael to reach the bleachers = 40s

As Bobby took lesser time to reach the bleachers, implies his high rate of work.

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This question involves the concept of magnification.

The distance to the magnified image will be "24 cm".

The magnification of the magnifying glass is given by the following formula:

\(M=\frac{q}{p}\\\\q=Mp\)

where,

Therefore,

q = (4)(6 cm)

q = 24 cm

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Answer:

A. Mountains on different continents match up.

Explanation:

Due to the drifting/ moving apart of the continents, land masses is split therefore in case of a mountain that split, it matches the other part in another continent.

I) The velocity 18/5 kmph in m/s is 4 m/s.

II) The velocity 5/18 kmph in m/s is 20 kmph.

Dimensional Analysis is a mathematical process used to convert one unit to another. This is done by multiplying the original value with a ratio of equivalent units that is equal to 1. When using dimensional analysis, it is important to keep track of units and cancel out any units that are not needed.

The following is the solution to the conversion of kmph to m/s and vice versa using dimensional analysis.

I) 18/5 kmph into m/s (velocity)When converting kmph to m/s, we need to multiply by 1000/3600 which is equal to 5/18 since there are 1000 meters in one kilometer and 3600 seconds in one hour. Therefore,18/5 kmph x 1000 m/1 km x 1 hour/3600 s = 4 m/s (velocity). Thus, 18/5 kmph is equal to 4 m/s.

II) 5/18 m/s into kmph (velocity)When converting m/s to kmph, we need to multiply by 3600/1000 which is equal to 18/5 since there are 3600 seconds in one hour and 1000 meters in one kilometer. Therefore,5/18 m/s x 3600 s/1 hour x 1 km/1000 m = 20 kmph (velocity). Thus, 5/18 m/s is equal to 20 kmph.

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Answer:

8

Explanation:

112meters divided by 14

The answer to the question is:

77.0 dB

When the distance from a point source of sound is doubled, the intensity level decreases by 6 dB. This decrease in intensity level with increasing distance is due to the spreading of sound waves over a larger area. According to the inverse square law, the intensity of sound is inversely proportional to the square of the distance from the source.

In this case, the distance is doubled from 2.00 m to 4.00 m. Since the distance is doubled, the intensity level will decrease by 6 dB. Therefore, we subtract 6 dB from the initial intensity level of 80.0 dB.

80.0 dB - 6 dB = 74.0 dB

So, the intensity level at a distance of 4.00 m from the source will be 74.0 dB.

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The current at point A = 3A, The current at B = 6 A, the current at C = 2.25 A, the current at D = 18 A.

The current flowing in the circuit is calculated as follows;

Same current will be flowing at point A and C since they are in series, while different current will be flowing in the rest of the circuit.

Total resistance  is calculated as;

1/R = 1/(3 + 9) + 1/6 + 1/2

1/R = 1/12 + 1/6 + 1/2

R = 1.33

The total current in the circuit;

I = V/R

I = 36 V / 1.33

I = 27 A

Current at B = 36 / 6 = 6 A

Current at D = 36 / 2 = 18 A

Current at A and C = 27 A - (6 + 18)A = 3 A

Current at A = 3 / 12 x 3 A = 0.75 A

current at C = 9 / 12  x 3A = 2.25 A

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Great question! Your answer is below.

They were created prior to the formation of our solar system, thus...

Huge, gigantic stars had to have existed, perished, and burst, releasing the materials they produced into the universe. These materials subsequently gathered via gravity to form our solar system and perhaps dozens or hundreds of others.

Our Sun is currently fusing hydrogen into helium; when hydrogen runs out, the Sun will compress a little, and the added pressure on the core will cause the helium to start fusing into carbon for a short while; then, the sun will die, and that will be that. Stars fuse lighter materials into heavier ones.

But with large stars, the outer layer may be made of hydrogen, which will be fusing into helium underneath it along a boundary. The helium layer will fuse into the carbon layer, the carbon layer will fuse into the calcium layer, and so on, up to the iron layer.

When iron production in a star's core starts, the star is doomed. The creation of elements *heavier* than Iron *takes* energy* Iron is the heaviest element ever formed that will release energy. Therefore, the star will eventually stop fusing, and its powerful gravitational pull will lead it to collapse. The abrupt in-falling mass generates the energy required for fusing the heavier metals, such as lead, gold, and uranium, after which the star's mass rebounds, resulting in the explosion known as a supernova. Before the formation of our solar system, all of this took place.'

Thanks!

- Eddie

The gravitational force between them change is force will be one-ninth as great.

It is possible to think of the gravitational force as an attracting force that pulls all mass-containing physical objects together. It is the known natural force with the lowest strength. Gravitational force is the name for the force that the earth exerts on a body. As an illustration of motion caused by gravity, consider how leaves and fruits fall to the ground from trees, how water flows down rivers, or how a ball tossed into the air flies to a height before falling back to earth. The universal force of attraction operating on all matter is known as gravity, usually spelled gravitation, in mechanics. It plays no part in determining the interior properties of common stuff because it is by far the weakest force in nature that is known to exist.e.

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Answer:

nitial GPE = final KE 2500*10*200 = ½ 2500*v^2 v^2 = 2*10*200 v= 63.24 m/sec

Explanation:

import numpy as np:

random_vector = np.random.rand(15)

modified_vector = np.where(random_vector == np.max(random_vector), -1, random_vector)

print("Original Array:", random_vector)

print("Modified Array:", modified_vector)

A NumPy program that creates a random vector of size 15, replaces the maximum value with -1, and prints both the original array and the modified array:

```python

import numpy as np

# Create a random vector of size 15

random_vector = np.random.rand(15)

# Find the maximum value in the vector

max_value = np.max(random_vector)

# Replace the maximum value with -1

modified_vector = np.where(random_vector == max_value, -1, random_vector)

# Print the original and modified arrays

print("Original Array:")

print(random_vector)

print("\nModified Array:")

print(modified_vector)

```

When you run this program, it will generate a random vector of size 15 and display the original array. Then, it will replace the maximum value in the array with -1 and display the modified array.

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Answer:

20°C

Explanation:

The relationship between temperature in degrees Fahrenheit(F) and degrees Centigrade (C) is

C = (F - 32) x 5/9

Given F = 68°F

C = (68-32) x 5/9

  =  36 x 5/9
  =  36/9 x 5

  = 4 x 5

  = 20°C

Answer:

20º C

Explanation:

The formula for converting Fahrenheit to Celsius is:

C = 5/9 • (F - 32)

Plugging 68º for F we get:

C = 5/9 •(68º-32)

C = 5/9 •(36)

C = 20º

A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. The basic model for this engine was developed by Nicolas Léonard Sadi Carnot in 1824. ... In the process of going through this cycle, the system may perform work on its surroundings, thereby acting as a heat engine.

To determine the acceleration of the freight elevator, we can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

Given:

Tension force (F) = 6.58 x 10^3 N (upward)

Mass of the elevator (m) = 521 kg

We need to consider the net force acting on the elevator. Since the tension force is upward and the elevator is moving downward, the net force can be calculated as the difference between the tension force and the force due to the gravitational pull:

Net force (F_net) = Tension force - Force due to gravity

The force due to gravity can be calculated using the equation F_gravity = m * g, where g is the acceleration due to gravity (approximately 9.8 m/s^2).

Substituting the given values, we have:

F_gravity = 521 kg * 9.8 m/s^2

Now we can calculate the net force:

F_net = 6.58 x 10^3 N - (521 kg * 9.8 m/s^2)

Next, we can use Newton's second law to calculate the acceleration (a):

F_net = m * a

Substituting the values:

6.58 x 10^3 N - (521 kg * 9.8 m/s^2) = 521 kg * a

Now we can solve for acceleration:

a = (6.58 x 10^3 N - (521 kg * 9.8 m/s^2)) / 521 kg

Calculating this expression will give us the acceleration of the elevator.

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The pivot is located 0.1 meters to the left of the 0 cm mark.

To determine the position of the pivot, ensure that the rule is horizontally balanced. This means that the sum of the clockwise moments must equal the sum of the anticlockwise moments.

Clockwise moments = 6N x 0.15m = 0.9Nm

Anticlockwise moments = 4N x 0.3m + 3N x d, where d is the distance of the pivot from the 0cm mark.

Since the metre rule is horizontally balanced:

0.9 = 1.2 + 3d

3d = -0.3

d = -0.1m

The position of the pivot is 0.1m to the left of the 0cm mark.

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