Suppose that you fill an ice-cube tray with water from the sink and put the trash in the freezer. The water’s temperature decreases because _________.
a. Cool air in the freezer flows into the water
b. Thermal energy flows out of the water into the air in the freezer
c. Water evaporates and moves into the air in the freezer
d. the water contracts at a lower temperature
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A shallow slope on a phase-change graph indicates - A. a little temperature increase for a lot of heat.

To understand this, let's break down the concepts involved:

Latent Heat: When a substance undergoes a phase change (like melting or boiling), it absorbs or releases heat without changing temperature. This heat is known as latent heat.

Phase Changes: During a phase change, such as ice melting into water, the temperature of the ice remains at 0°C until it has completely melted. Only after the phase change is complete does the temperature of the water begin to increase.

Shallow Slope on Graph: In a graphical representation, the shallow slope during a phase change signifies that while a large amount of heat is added, the temperature remains constant until the phase change is completed. This reinforces the idea that energy is being used to break molecular bonds rather than increasing kinetic energy.

Answer:

the rotation of the earth once on its axis

a) To get the vertical component of the ball's velocity just  before it hits the floor, we will use the equation of motion expressed as:

[tex]v_y = u + gt[/tex]

where:

u is the initial velocity

g is the acceleration due to gravity

t is the time taken

Given the following:

Substitute into the formula as shown:

[tex]v_y=0+10(0.6)\\v_y=6.0m/s[/tex]

Hence the vertical component of the ball's velocity just  before it hits the floor is 6.0m/s

b) Since the ball rolls off a table with a horizontal velocity of 5 m/s, hence  the horizontal component of the ball's velocity  just before it hits the floor

is 5m/s

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The vertical component of the ball's velocity just before it hits the floor is 6 m/s and the horizontal component of the ball's velocity just before it hits the floor is 5 m/s.

a. The vertical component of the ball's velocity just before it hits the floor can be calculated using the formula v = gt, where g is the acceleration due to gravity and t is the time. Therefore, v = 10 m/s2 x 0.6 s = 6 m/s.

b. The horizontal component of the ball's velocity just before it hits the floor remains the same as the original horizontal velocity, which is 5 m/s. This is because in the absence of air resistance, there are no horizontal forces acting on the ball after it leaves the table, so its horizontal velocity remains constant.

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Answer:6000m/s

Explanation:

Total cost of electric iron used for 24 hrs is 72000 tsh.

Explanation:

Given

Voltage, V = 340 V

Power, P = 1000 W  = 1 kW

Time, T = 24 hrs

Cost per unit = 3000 tsh /unit

Total cost, T = ?

We know,

The cost is calculated in kWh

Therefore,

Total Power consumed = 1 kW X 24 hrs

Total Power consumed = 24 kWh

Total cost = total power X cost per unit

Total cost = 24 kWh X 3000 tsh/unit

Total cost = 72000 tsh

Therefore, total cost of electric iron used for 24 hrs is 72000 tsh.

Answer:

1,634.1 W

Explanation:

Power = work / time

P = 41,505.4 J / 25.4 s

P = 1,634.1 W

Answer:to transfer electric current from one point to another

Explanation:

To transfer electric current from one point to another

Answer:

To conduct electricity.

Explanation:

The purpose of conducting wires in a circuit is to conduct electricity. The wire conducts electricity by allowing current flow through it from one point to another in the circuit .

Answer:

while all of the world can experience a solar eclipse it is not normally at the same time so one part of the earth might have it but not the other and even in one area if there is one in north america like the last one in texas we did not have a full eclipse

Answer: To answer your question.Not at all because the shadow that the moon cast on the earth is not very broad,as the earth rotates ,the path of the total eclipse is a narrow one.

Total solar eclipses are rare events actually. Although they occur somewhere on Earth every 18 months on average, this is estimated to recur at any given place only once every 360 to 410 years, on average as the case may be .

Answer:

87.5 m/s

Explanation:

350m * 0.25s = 87.5 m/s

Answer: the angles are equal

Explanation:

Answer:to prevent serious damage when an accident occur

Explanation:to prevent serious damage when accident occur

Airbags and other safety devices are important as they use the physics concept of impulse to reduce the force on an individual by increasing the impact duration during collisions, thereby reducing the likelihood of injuries or fatalities.

Airbags, helmets, and other safety devices are crucial because they employ the concept of impulse from physics, which helps in reducing the force felt by individuals during collisions. Impulse is defined as the net force multiplied by the time duration over which it acts ([tex]F_{net}[/tex] Δt). When a vehicle is involved in an accident, safety devices such as airbags extend the time over which a person's momentum is brought to a stop. Consequently, the force exerted on their body is significantly reduced, minimizing the risk of severe injuries or fatalities. The concept is that by increasing the time Δt, while the momentum change Δp remains constant, the net force [tex]F_{net}[/tex] is decreased, which illustrates an inverse relationship between force and time during impact. This principle not only applies to airbags, which allow for a more gradual deceleration and less forceful impact but to other vehicle safety aspects, such as crumple zones that extend the collision time, hence reducing the force and potential injury.

Answer:

6118N

Explanation:

Answer:

θ = 30⁰  

Explanation:

We have been given two wave displacement equations,

[tex]y_{1} =2sin\theta +1[/tex]     ........(1)

[tex]y_{2}=3sin\theta +0.5[/tex]     ........(2)

The waves will have same displacements when [tex]y_{1}=y_{2}=y[/tex] (say)

Therefore, operating (2) - (1), we get,

[tex]sin\theta - 0.5=0[/tex]

or, [tex]\theta = sin^{-1}(0.5)=30^{o}[/tex] (since, sin 30⁰ = 0.5)

We can check the answer by putting [tex]\theta=30^{o}[/tex] in equations (1) and (2),

[tex]y_{1}=2sin30^{o}+1=2\times0.5 + 1= 2[/tex]

[tex]y_{2}=3sin30^{o}+0.5=3\times0.5+0.5=1.5+0.5=2[/tex]

Answer:

θ= 30°

Explanation:

Set the wave functions equal to another, as displacements would be the same. Therefore, 2sin θ+1 = 3sin θ+.5.

sin θ=.5

θ= 30°

Answer:

68.1N

Explanation:

Check attachment

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Answer:

kinetic energy of the object is 24 J

Explanation:

As we know that kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

here we know that

m = 3 kg

v = 4 m/s

so we will have

[tex]k = \frac{1}{2}(3)(4^2)[/tex]

[tex]k = 24 J[/tex]

so kinetic energy of the object is 24 J

The kinetic energy of the object is 24 J.

Given data:

The mass of object is, m = 3 kg.

The speed of the object is, v = 4 m/s.

The kinetic energy of an object is the energy possessed by any object due to its motion, which is mathematically expressed as half multiplied by mass and square of the speed of object.

That is,

[tex]KE = \dfrac{1}{2}mv^{2}[/tex]

Here, KE is the kinetic energy of object.

Solving as,

[tex]KE = \dfrac{1}{2} \times m \times v^{2}\\\\KE = \dfrac{1}{2} \times 3 \times 4^{2}\\\\KE = 24 \;\rm J[/tex]

Thus, we can conclude that the kinetic energy of the object is 24 J.

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Answer:

60.53km

Explanation:

Check attachment

The momentum of truck is 20790 kg m/s

Solution:

Given that we have to find the momentum of truck

From given, 1155 kg truck has a velocity of 18 m/s

Therefore,

Mass = 1155 kg

Velocity = 18 m/s

The momentum is given by formula:

[tex]p = m \times v[/tex]

Where, m is mass in kg and v is velocity in m/s

Substituting the values we get,

[tex]p = 1155 \times 18\\\\p = 20790[/tex]

Thus momentum of truck is 20790 kg m/s

The best description for the weather shown by the blue triangles on a line on a weather map is by the statement that a cold front can cause heavy rain, thunder, and lightning.

Answer: Option A

Explanation:

The weather map consist of four symbolic color mathematical features. The blue colored triangle represents the cold front. Red colored semi circle, on the other hand, represents the warm front. Then there are some complex symbols, such as the purple colored line with semi circle and triangle drawn in the same side, this represents the occluded front.

Then similarly, purple colored line drawn with semi circle on side and triangle drawn on the other side, represents the Stationary front. Therefore, here the blue colored triangles on a line represents the cold front can cause heavy rain, thunder, and lightning.

The frequency of the waves generated by a rope that vibrates every 0.5 seconds is 2 Hz, as frequency is the inverse of the period. Hence, the correct answer is B.

The frequency of a wave is defined as the number of cycles per second, and it is the inverse of the period (the time for one complete cycle). So, if a rope vibrates every 0.5 seconds, that means the period (T) is 0.5 seconds. To find the frequency (f), we use the formula f = 1/T. Therefore, the frequency of the waves is f = 1/0.5 s = 2 Hz.

The mechanical energy isn't conserved. Some energy is lost to friction.

Option A.

The mechanical energy is defined as the energy of a body which it achieves by virtue of its position and velocity. The mechanical energy are of two types - potential energy and kinetic energy. The potential energy is the energy of the body which it achieves by means of its relative position and is directly proportional to the height of the body from its relative plane. Whereas the kinetic energy of the body is achieved by virtue of its velocity and is directly proportional to the square of velocity of the body.

As the mountaineer is skiing down the slope of a mountain, the potential energy of the person is gradually changing into his kinetic energy. Had it been in an ideal situation, the potential energy lost would have been just equal to the kinetic energy gained by the person. But there's friction which opposes the speed of the body and reduces the velocity. Thus the kinetic energy will be lost to some extent and the energy won't be conserved.

the correct answer is B) The mechanical energy isn't conserved. Some energy is lost to friction.

Answer:

For a positive point charge, the lines radiate outward. While, for a negative point charge, the lines converge inward.

Explanation:

The electric field produced by a single point charge has a radial shape and follows an inverse square law. The magnitude is given by

[tex]E=k\frac{q}{r^2}[/tex]

where

k is the Coulomb's constant

q is the magnitude of the charge

r is the distance from the charge

The direction of the field depends on the sign of the charge. In particular, we have:

This is due to the fact that the direction of the field shows the direction of the force that a positive test charge would experience in this field. Therefore, since a positive test charge would feel a repulsive force in the field produced by a positive charge, then the direction of the field is outward; on the other hand, a positive test charge would feel an attractive force in the field produced by a positive charge, therefore the direction of the field is inward.

Answer: 784 J

Explanation:

Potential energy is expressed in:

PE= mgh

= 2 kg x 9.8 m/s² x 40 m

= 784 J

Answer:

Three types of potential energy include: Elastic potential energy, which is the energy stored in something when you push, pull, or force it out of shape: think of rubber bands or springs. Chemical potential energy, which is the energy something stores because of its chemical makeup: batteries have this kind of energy.

Explanation:

Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy.

Energy is the capacity to do work or create change. It exists in various forms, including kinetic (movement), potential (stored), thermal (heat), electrical, and chemical energy. Energy is a fundamental concept in physics and is vital for all processes in the universe, from powering machines to sustaining life and ecosystems.

Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy. Potential energy is the energy an object has due to its position or condition, while kinetic energy is the energy an object possesses due to its motion. Gravitational potential energy is a specific type of potential energy that an object has due to its position relative to the Earth's surface.

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Answer:

on days when high particle levels are expected, take these extra steps to reduce pollution:

Explanation:

1) reduce the number of trips you take in your car.

2) reduce or eliminate fireplace and wood stove use.

3) avoid burning leaves, trash, and other materials.

4) avoid using gas-powered lawn and garden equipment.

Answer:

A

Explanation:

The equation of power is defined as Power = Workdone/Time Taken

And workdone = Force x Distance so using these equations we get they workdone is, 200x 10 = 2000Nm.

Dividing workdone with time will yield power, 2000 ÷ 8 = 250 Nm/s = 250W.

Answer:

Elements in a period have wide range of chemical properties.

Explanation:

Answer:

The buoyant force pushing up is greater than the force of gravity pushing down, and you feel the unbalanced force pushing on your hand.

Explanation:

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Answer:

The buoyant force pushing up is greater than the force of gravity pushing down, and you feel the unbalanced force pushing on your hand.

Explanation:

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The temperature change of water is equal to 71.67 °C

Given:

Amount of transferred energy = 30,000 K J

Mass of water = 100 ml

Initial temperature = 20°C

To find the change in temperature of water.

Formula for Heat capacity is given by

Q = m×c×Δt ........................................(1)

where:

Q = Heat capacity of the substance (in J)

m=mass of the substance being heated in grams(g)

c = the specific heat of the substance in J/(g.°C)

Δt = Change in temperature (in °C)

Δt = (Final temperature - Initial temperature) = T(f) - T(i)

Q = 30,000 J

Mass of water = m = 100 ml

1 ml = 1 g ................................................(2)

Therefore m = 100 ml = 100 g

Specific heat of water is c = 4.186 J /g.

Δt = ?

Substituting these in equation (1), we get

Q = m×c×Δt

Rearranging the terms for Δt,

Δt = [tex]\frac{Q}{m\times c}[/tex]

Δt = [tex]\frac{30,000}{100\times 4.186} = \frac{30,000}{418.6}= 71.67\°C[/tex]

Δt = 71.67 °C

Answer:

F = ma

Explanation:

If mass = m

Acceleration = a

Force = F

Force can be calculated by the product of mass and acceleration.

That is F = ma

This equation is gotten from newton's second law of motion which states that the rate of change of momentum of a body is proportional to the applied force which takes place in the direction of force applied

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Answer:

Force = mass x acceleration i.e F = ma

Explanation:

The force equation is in accordance with Newton's second law of motion, the law states that the acceleration of an object depends on two variables which are

i)  The force acting upon the object.

ii) The mass of the object.

The acceleration of an object is directly proportional to the force acting on the object, and inversely proportional to the mass of the object.

This means that if the force acting on the object increases, the acceleration of the object will also increase and if the mass of the object increases, the acceleration of the object will decrease.

a ∝ F  ------ eqn 1

a ∝ [tex]\frac{1}{m}[/tex] ------ eqn 2

where a = acceleration

F = Force

m = mass

Applied force is the interaction of an object which can be described as an active agent with another object which causes the second object to either accelerate, experience a change in velocity, a change in direction or bring to a halt.

Mass is the amount of matter or substance that makes up an object.

Acceleration is a measure of the change in velocity of an object with respect to time.

combining eqn 1 and eqn 2

[tex]a = \frac{F}{m}[/tex]

i.e

F = ma  ------ eqn 3

eqn 3 is the force equation

A force equation depicts the relationship between force, mass, and acceleration. An object of mass m will accelerate given that force F is applied to it.

Answer:

yes

Explanation:

Final answer:

The distance traveled by train B in time t is 5.42 times greater than the distance traveled by train A in the same time t.

Explanation:

The distance traveled by train B in time t is greater than the distance traveled by train A in the same time t by a factor of 5.42.

To understand this, let's assume the initial speed of both trains is v. After time t, train A doubles its speed, so its new speed is 2v. On the other hand, train B increases its speed by a factor of 5.42, so its new speed is 5.42v.

Since the distance traveled by a train is directly proportional to its speed, the distance traveled by train B will be 5.42 times greater than the distance traveled by train A in time t.