Which of the following best describes a solid?
A
matter is made of atoms so tightly packed together that they cannot move around
B
takes the shape and volume of its container
C
has a definite volume, but takes the shape of its container

Answer:

t = 25.5 min

Explanation:

To know how many minutes does Richard save, you first calculate the time that Richard takes with both velocities v1 = 65mph and v2 = 80mph.

\(t_1=\frac{x}{v_1}=\frac{150mi}{65mph}=2.30h\\\\t_2=\frac{x}{v_2}=\frac{150mi}{80mph}=1.875h\)

Next, you calculate the difference between both times t1 and t2:

\(\Delta t=t_1-t_2=2.30h-1.875h=0.425h\)

This is the time that Richard saves when he drives with a speed of 80mph. Finally, you convert the result to minutes:

\(0.425h*\frac{60min}{1h}=25.5min=25\ min\ \ 30 s\)

hence, Richard saves 25.5 min (25 min and 30 s) when he drives with a speed of 80mph

Explanation:

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DIY

The total distance is 105 kilometers and the total displacement is 15 kilometers east. Option C

To calculate the total distance, we add the distances traveled in each leg of the journey: 60 kilometers (from A to B) + 45 kilometers (from B back to A) = 105 kilometers.

However, displacement refers to the change in position of an object in a straight line from its starting point to its ending point. In this case, since the boat starts and ends at the same point (A), the total displacement is zero.

Hence The total distance is 105 kilometers and the total displacement is 15 kilometers east.

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Answer:

The temperature of the steam during the heat rejection process is 42.5°C

Explanation:

Given the data in the question;

the maximum temperature T\(_H\) in the cycle is twice the minimum absolute temperature T\(_L\) in the cycle

T\(_H\)  = 0.5T\(_L\)

now, we find the efficiency of the Carnot cycle engine

η\(_{th\) = 1 - T\(_L\)/T\(_H\)

η\(_{th\) = 1 - T\(_L\)/0.5T\(_L\)

η\(_{th\) = 0.5

the efficiency of the Carnot heat engine can be expressed as;

η\(_{th\) = 1 - W\(_{net\)/Q\(_H\)

where W\(_{net\) is net work done, Q\(_H\) is is the heat supplied

we substitute

0.5 = 60 / Q\(_H\)

Q\(_H\) = 60 / 0.5

Q\(_H\) = 120 kJ

Now, we apply the first law of thermodynamics to the system

W\(_{net\) = Q\(_H\) - Q\(_L\)

60 = 120 -  Q\(_L\)

Q\(_L\) = 60 kJ

now, the amount of heat rejection per kg of steam is;

q\(_L\) = Q\(_L\)/m

we substitute

q\(_L\) = 60/0.025

q\(_L\) = 2400 kJ/kg

which means for 1 kilogram of conversion of saturated vapor to saturated liquid , it takes 2400 kJ/kg of heat ( enthalpy of vaporization)

q\(_L\) = h\(_{fg\) = 2400 kJ/kg

now, at  h\(_{fg\)  = 2400 kJ/kg from saturated water tables;

T\(_L\) = 40 + ( 45 - 40 ) ( \(\frac{2400-2406.0}{2394.0-2406.0}\\}\) )

T\(_L\) = 40 + (5) × (0.5)

T\(_L\) = 40 + 2.5

T\(_L\) = 42.5°C  

Therefore, The temperature of the steam during the heat rejection process is 42.5°C  

The magnitude of the force exerted on this object is 1.2 Newton.

Given the following data:

In Science, the impulse that is experienced by an object is always equal to the change in momentum of the object, due to the force acting on an object.

Mathematically, impulse is given by this formula:

\(Impulse = change\;in\;momentum\\\\Force \times time = m \Delta V\)

Substituting the given parameters into the formula, we have:

\(Force \times 10=12\\\\Force =\frac{12}{10}\)

Force = 1.2 Newton.

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A. Sheets of copper (Cu) could be a good option for replacing the foam and carbon material in the hero's costume. Copper is a relatively soft metal and can easily be shaped and molded. When hit with a lead pipe, it will dent but not crumble like foam and carbon. Additionally, copper has a distinctive color that could look interesting on the hero's costume.

B. Large discs of chlorine (Cl) would not be a good option for replacing the foam and carbon material. Chlorine is a highly reactive and dangerous gas that is used to disinfect swimming pools. It is not a solid material and would not provide the desired effect when hit with a lead pipe.

C. A barrel of phosphorus (P) would also not be a good option for replacing the foam and carbon material. Phosphorus is a highly reactive and flammable substance that is used as a component in explosive powder. It is not a solid material and would not provide the desired effect when hit with a lead pipe. Additionally, it is highly dangerous and should not be used in a movie set.

D. A tank of helium (He) would also not be a good option for replacing the foam and carbon material. Helium is a gas and would not provide the desired effect when hit with a lead pipe. Additionally, it is not a solid material and would not be suitable for the costume.

Overall, the best option would be A, sheets of copper, as it is a solid material that can easily be shaped and molded, and will dent but not crumble when hit with a lead pipe.

The earthquake would occur 13 minutes before 10:05 a.m. which will be at 9.52 am.

The p-waves travel with a constant velocity of 7 km/s

The time can be calculated by using the formula

t = d / v

where

T1 =  10:05 a.m

d is the distance they take to travel from the epicenter

v is the speed of the p-waves

On average, the speed of p-waves is

v = 7 km/s

d = 5600 km (given)

Substituting the values in the formula;

t = d / v

t = 5600 ÷ 7

t = 800 seconds

Converting into minutes,

t = 800 ÷ 60

t = 13.3

≈ 13 mins

T1 -  13 mins = T2

10:05 - 13 mins = 9.52 am

It means the earthquake occurred prior 13 minutes, that is at 9.52 am.

Therefore, the earthquake occurred at 9.52 am.

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Answer:

I think he should move the purple car to the right. good luck

Answer:

b

Explanation:

The answer is B. Why is the ocean floor not flat and smooth like the bottom of a bathtub?

Scientists were surprised to find that the ocean floor was not a flat and featureless plain, but rather had mountains, valleys, and other geological features. This discovery raised questions about how these features formed and what processes were involved. Scientists began to investigate the causes of these features, such as plate tectonics and volcanic activity, and how they might have shaped the ocean floor over millions of years. Understanding the complex and dynamic nature of the ocean floor has since become an important area of study in earth science and oceanography.

Photochemical smog is produced. Nitrogen oxides (NOx) and volatile organic compounds (VOCs) from vehicle exhaust combine with sunlight to create photochemical smog.

When sunlight interacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere, photochemical smog is created. Automobile exhaust, coal-fired power plants, and industrial pollutants all produce nitrogen oxides.

When nitrogen oxides and volatile organic compounds (VOCs) combine with sunlight, a mixture of pollutants called photochemical smog is produced, which explains why there is a brown cloud above cities. Due to the fact that we receive the most sunshine in the summer, it tends to happen more frequently.

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Total displacement:-

\(\\ \sf\longmapsto 47-16=31m\)

\(\\ \sf\longmapsto Avg\: Velocity=\dfrac{Total\: Displacement}{Total\:Time}\)

\(\\ \sf\longmapsto Avg\: Velocity=\dfrac{31}{12}\)

\(\\ \sf\longmapsto Avg\: Velocity=2.5m/s\)

The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².

To calculate the average acceleration of the motorcycle, we can use the formula:

Average acceleration = (final velocity - initial velocity) / time

First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.

Converting the final velocity:

Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s

Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:

Average acceleration = (21.67 m/s - 0 m/s) / time

To find the time taken to reach this velocity, we need to use the formula for average speed:

Average speed = total distance/time

Rearranging the formula:

time = total distance / average speed

Plugging in the values:

time = 50 m / 21.67 m/s ≈ 2.31 seconds

Now we can calculate the average acceleration:

Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²

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(a) The amplitude of the wave is determined as 8 cm.

(b) The period of the wave motion is  20 s and the frequency of the wave is 0.05 Hz

(c) The wavelength of the wave is 500 cm.

(a) The amplitude of the wave is the maximum displacement of the wave.

from the graph, amplitude of the wave = 8 cm

(b) The period of the wave motion is calculated as;

T = 20 s

The frequency of the wave = 1/T = 1/20 s = 0.05 Hz

(c) The wavelength of the wave is calculated by applying the following wave formula.

λ = v / f

λ = 25 cm/s / 0.05 Hz

λ = 500 cm

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Answer:

A step down transformer is a device that can be connected to the switch and the appliance. There are two types of transformers that you should know about: step up and step down transformers. Step up transformers generally produce a higher output voltage than the input voltage.

Explanation:

Using what has been learned about research methods, some of the limitations of Freud’s theory of personality are

This is further explained below.

Generally, Id, ego, and superego, according to Freud, make up the three parts of the mind, and interactions and conflicts between these parts are what provide personality (Freud, 1923/1949).

The id, according to Freudian thought, is the psychological trait that serves as the foundation for our most primal instincts.

In conclusion,

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Answer:

C. 750 N. left

Explanation:

let the force to the right be positive, and the left be negative

Step one:

given

mass of crate m= 500N

1450N force left

Frictional force of 200 N -----this opposes the motion

500 N opposing force to the right

The net force is equal to the summation of all the forces in Newton

Net force= -1450+200+500

Net force=-750N

The direction is right

Answer: The directions shown, near the wire is moving anticlockwise

Explanation:

When the current in the wire AB decreases, the magnetic flux linked with the loop (which is out of the page) will decrease. Hence, the current induced in the loop must be anticlockwise to oppose the decrease in magnetic flux.

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Answer:

force needed for the bus to go round the corner is 50,000 N.

Explanation:

To find the force needed for the bus to go round the corner, we can use the formula for centripetal force:

F = (mv^2)/r

where F is the centripetal force, m is the mass of the object, v is the velocity of the object, and r is the radius of the circular path.

Plugging in the values given in the problem, we get:

F = (2500 kg)(5 m/s)^2 / 50 m

= 50,000 N

So the force needed for the bus to go round the corner is 50,000 N.

Answer:

No. A:

1-tension

No. B:

4-the string

Explanation:

The upward force that acts on the book is called "tension" while the "string" is the object that exerts a force on the block that is directed to the right.

As the string is pulled, the tension exerts an upward force on the block. The frictional force acts on the block to the left. So, both the tension and friction will act on the block in order to effect its pulling on the surface of the table.

Answer:

2.5J

Explanation:

Work done = Force x Distance

= 0.5 x 5

= 2.5J

The work done that should be accomplished should be 2.5 J.

Since the force is 5 newtons

The box moves 0.5 meters

So here the work done should be

= Force x Distance

= 0.5 x 5

= 2.5J

here we basically multiply the force with the distance so that the work done should be determined.

hence, The work done that should be accomplished should be 2.5 J.

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The circuit breaker must be rated 9.6 A for you to operate both of these appliances at the same time.

The power dissipated is given by the formula;

P = IV

Where;

P = power dissipated

I = current

V = voltage

From the question we have the following information;

P = 1100 W

V =  114 V

I = ?

Substituting values and making current the subject of the formula;

I = P/V

I =  1100 W/ 114 V

I = 9.6 A

The circuit breaker must be rated 9.6 A for you to operate both of these appliances at the same time.

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Answer:

The velocity of the box is related to the angular velocity of the spool, which is given by the equation:

v = r * ω

where r is the radius of the spool and ω is the angular velocity of the spool. The angular velocity of the spool, in turn, is related to the torque applied to the spool by the tension in the string, which is given by the equation:

τ = I * α

where τ is the torque, I is the moment of inertia of the spool, and α is the angular acceleration of the spool.

The tension in the string is equal to the weight of the box, which is given by:

T = m * g

Putting all of these equations together, we can solve for the time it takes for the box to reach the floor. Here's how:

First, we can find the angular acceleration of the spool using the torque equation:

τ = I * α

T = m * g = τ

m * g = I * α

α = (m * g) / I

α = (35.30 kg * 9.81 m/s^2) / 4.00 kg*m^2

α = 86.53 rad/s^2

Next, we can find the angular velocity of the spool using the kinematic equation:

ω^2 = ω_0^2 + 2 * α * θ

where ω_0 is the initial angular velocity (which is zero), θ is the angle through which the spool has turned (which is equal to the distance the box has fallen divided by the radius of the spool), and ω is the final angular velocity (which is what we want to find). Solving for ω, we get:

ω^2 = 2 * α * θ

ω = sqrt(2 * α * θ)

ω = sqrt(2 * 86.53 rad/s^2 * (3.50 m / 0.10 m))

ω = 166.6 rad/s

Finally, we can find the time it takes for the box to reach the floor using the equation:

v = r * ω

v = 0.10 m * 166.6 rad/s

v = 16.66 m/s

t = d / v

t = 3.50 m / 16.66 m/s

t = 0.21 s

Answer: Planetary nebular is

A shell of gas ejected by and expanding away from an extremely hot dying high-mass star

An expanding atmosphere of a low-mass star as it becomes a red Giants.

Explanation:

Planetary nebular is a form of nebula emission that comprises an expanding and glowing shell of gas that is ejected from red giant stars.

Planetary nebulae play an important role in the chemical evolution of the Milky Way by expelling elements into the interstellar medium from stars where those elements were produced.

Answer: \(3000\ W,\ 78,000\ J\)

Explanation:

Given

The voltage of the battery is \(V=12\ V\)

Current through the battery is \(I=250\ A\)

(a) Power is the product of voltage and current

Power dissipates is given by

\(P=VI\\P=12\times 250\\P=3000\ W\)

(b) Energy delivered

\(E=P\times t\)

\(E=3000\times 26\\E=78,000\ J\)

Answer:

K.E. = ½ × mv²

= ½ × 120 × (2.5)²

= 60 × 6.25

= 375 J

Answer:

A and D

Explanation:

They are the only two options with constant vertical and horizontal velocity