Which of the following processes requires a physical medium (a solid, liquid, or gas) to transfer thermal energy from one object to another?
I. conduction
II. convection
III. radiation
A. I and III only
B.I and II only
C. III only
D. II only
E. none of these require a physical medium to transfer thermal energy.

Atomic mass can be changed by the nuclear reactions which are nuclear fission and nuclear fusion.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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It's B! I already took the test

one skateboard = rolls across the room

second skateboard = moves a few feet

the second skateboard is the one who worked more. there was more friction on the ground in which the skateboard couldn't glide across the room like the first one. friction is a force. the skateboard had to work harder to move across the room because of friction.

in other words, it's the skateboard that did NOT roll across the room worked harder

Sn is Tin which has 50 atomic number

it means it has 50 electrons in its outer shells

+2 shows its valency

plus sign comes when electrons are removed from an atom

so here 2 electrons are removed from Sn atom

remaining electrons are 50-2

48 electrons

Answer:

N = 75 cycles per second

Explanation:

As we know that frequency is defined as the number of cycles per second

so here we can say that frequency is same as the number of cycles per second

so here given that

[tex]frequency = 75 Hz[/tex]

so here we have

Number of cycles per second = 75 Hz

When a positively charged particle enters a magnetic field, it experiences a force perpendicular to its velocity and the magnetic field, causing it to follow a curved path, typically resulting in circular or spiral motion.

If a positively charged particle moves into a magnetic field traveling in a straight line, its motion will change according to the Lorentz force law. When a positively charged particle enters a magnetic field, it experiences a force known as the Lorentz force that acts perpendicular to both the magnetic field and the velocity of the particle. As a result, the particle's path will bend and it will undergo circular motion or spiral along the field lines, depending on multiple factors such as the angle at which it enters the field.

For instance, if a positively charged particle is moving to the left and enters a magnetic field pointing towards the top of the page, the magnetic force acting on it will be directed into the page, causing it to deviate from its straight-line path. Similarly, if the particle is moving to the right, the force will be directed out of the page. If the magnetic field is uniform, the particle follows a curved path and may complete a full circle, with the radius of this circle determined by the particle's charge, velocity, and the magnetic field strength.

The direction of force and hence the subsequent motion of a positive particle differs from that of a negative particle due to their opposite charges. Different velocities or magnetic field strengths will result in different path curvatures, hence to measure the mass of a charged particle, one might need to observe its motion under various conditions. Doubling the charge or the magnetic field strength will affect the radius of the circular path, while doubling the velocity will change the shape of the path.

For neutral particles, there is no direct interaction with the magnetic field, and as such, their paths remain unaffected. To summarize, a positively charged particle's motion in a magnetic field results in a curved path that depends on its charge, velocity, magnetic field strength, and mass.

The Answer would be 4j

Answer:

ITS C

Explanation:

hope that helps :)

Answer:  The momentum of the system after the collision is 0.2 kg m/s.

Explanation:

According to the conservation of momentum, the total momentum of the system before the collision is same the total momentum of the system after the collision in an isolated system.

[tex]m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}[/tex]

Here, m_{1},m_{2} are the first and second object, v_{1},v_{2} are the initial velocities of the first and second objects and u_{1},u_{2} are the final velocities of the first and the second objects.

Use the formula of the conservation of the momentum.

[tex]m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}[/tex]

Put m_{1}=0.6 kg, m_{2}=0.5 kg, v_{1}=0.5 m/s and v_{2}=-0.2 m/s.

[tex]m_{1}u_{1}+m_{2}u_{2}=(0.6)(0.5)+(0.5)(-0.2)[/tex]

[tex][tex]m_{1}u_{1}+m_{2}u_{2}[/tex]= 0.2 kg m/s[/tex]

Therefore, the momentum of the system after the collision is 0.2 kg m/s.

Answer:

0.2

Explanation:

took the quiz

Answer: A. Poor circulation

Explanation:

Stretching is a kind of physical activity which involves a specific muscle activity. In this the muscles are stretched to the maximum so as to increase the stamina and flexibility of the muscle fibers. It is done to achieve a desire muscular motion.

Among the given options, the poor circulation is correct. As the stretching process will restrict the flow of the blood in blood vessels due to stretching of muscles.

Option (A) is correct. The poor circulation is not considered as a benefit of stretching.

Explanation:

The stretching is considered to be the warming up exercise that increases the energy of the body and help the body in getting ready for the task to be performed.

The stretching helps the body to gain the sufficient amount of energy and also helps the body the be prepared for doing anything that requires a bit of higher amount of energy than the normal.

Therefore, stretching can be referred to as the exercise that helps in increasing the speed and the energy output of the body. It is also regarded as the exercise that helps in increasing the flexibility of the body.

After stretching, since the flexibility of the body is increased. There are less chances of the body facing any injury. So, stretching also reduces the chance of injury.

The stretching increases the energy of the body. Therefore, it will also increase the rate of circulation in the body.

Thus, Option (A) is correct. The poor circulation is not considered as a benefit of stretching.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Exercise and energy

Keywords:

Circulation, blood, poor, energy, speed, increase, power, exercise, stretching, warm up, flexibility, injury, reduce, benefit.

An example of radiation is that a rock is warmed by an ultraviolet heat lamp. Thus, the correct option is B.

Radiation may be defined as the process of emission of energy in form of waves that originated from a source and travels through space at the speed of light.

Radiation actually occurs in close association with the waves of atmospheric air.

An ice pack that is placed on a knee, Hot coffee in a mug, and Cold salt water sinks do not provide any space for the entrance of atmospheric air.

Therefore, an example of radiation is that a rock is warmed by an ultraviolet heat lamp. Thus, the correct option is B.

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Answer:  C. Measure the soil's volume and then the volume of water that the soil can absorb.

Soil porosity can be defined as the amount of pores or air spaces present inside the soil mass. These pores forms due to the movement of roots, earthworms and insects inside the soil. These pores helps in aeration of the soil and water retention. Both of these factors helps in the growth of the plants.

Porosity can be judged by the measuring the soil's volume and then the volume of water that the soil can absorb. The volume of water found in the soil will depend upon the amount of pores present in the soil hence, reflecting the porosity of the soil.

Final answer:

The current through the secondary coil of the given ideal transformer is calculated to be 3281.7 milliamps using the transformer equations and the provided values of primary voltage, turns ratio, and load resistance.

Explanation:

To calculate the current through the secondary coil of an ideal transformer, we need to use the transformer equations:

The voltage transformation ratio is given by:

V

p

/ V

s

= N

p

/ N

s

Where Vp is the primary voltage, Vs is the secondary voltage, Np is the number of turns in the primary coil, and Ns is the number of turns in the secondary coil. Given that the transformer is ideal, the power on both sides is equal, therefore:

P = V

p

× I

p

= V

s

× I

s

To find the secondary current (Is), we rearrange the power equation to solve for Is:

I

s

= P / V

s

Using Ohm's law (V = IR), we can find the secondary voltage (Vs) which is the voltage across the load resistance (R):

V

s

= I

s

× R

Combining the two sets of equations, we have:

V

p

/ (I

s

× R) = N

p

/ N

s

The primary voltage (Vp) is given as 36 volts, the primary turns (Np) are 86, the secondary turns (Ns) are 85, and the load resistance (R) is 19 ohms.

Solving for Is, we get:

I

s

= (N

s

/ N

p

) × (V

p

/ R)

Is = (85 / 86) × (36 V / 19 Ω)

Is = 1.732 × 1.895

Is = 3.2817 A

Since the question asks for the answer in milliamps:

Is = 3281.7 mA

The current through the secondary coil is thus 3281.7 milliamps.

Their is no such dependency on material of the core placed in the coil

When a current flows in a conducting material , it constitutes a magnetic field around it in a circular motion.

Magnetic field around a current-carrying coil of wire depend upon

a) Number of turns  of wire in the coil as the number of  turns increases

magnetic field also increases .(Directly proportional)

b) The thickness of the wire , as radius increases magnetic field decreases

(Inversely proportional)

c) current flowing through the conductor as magnitude of current increases magnetic field will also increase (directly proportional)

d) their is no such dependency on material of the core placed in the coil

hence correct answer option d)the material of the core placed in the coil

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Answer:

C. DC motor

Explanation:

DC motor is an electrical machine which converts DC electrical current into mechanical energy. Generally DC motors work on the forces produced by magnetic fields. Here(in the given diagram) stater is made from the permanent magnets in which magnetic rotor rotates. The rotating magnetic field interacts with stater's permanent magnet and generate torque which rotates armature.

When a plastic rod is rubbed against a wool shirt and acquires a charge of -4.9 µC, it means that about 3.06 × 10¹³ electrons have been transferred from the shirt to the rod.

The plastic rod acquires a charge of -4.9 µC after being rubbed against a wool shirt. This negative charge means that electrons have been transferred from the wool shirt to the plastic rod. To determine the exact number of electrons transferred, we can use the following formula that connects the amount of charge and the number of electrons:

Q = n × qe

where 'Q' is the total charge, 'n' is the number of electrons, and 'qe' is the elementary charge, which is 1.6 × 10⁻¹⁹ C. We solve this equation for 'n':

n = Q / qe

When we put the values in, we get:

n = -4.9 µC / 1.6 × 10⁻¹⁹ C

To convert microcoulombs (µC) to coulombs (C), we must multiply by 10⁻⁶. Hence, the calculation becomes:

n = -4.9 × 10⁻⁶ C / 1.6 ×10⁻¹⁹ C = approximately 3.06 × 10¹³ electrons

So, roughly 3.06 × 10¹³ electrons are transferred from the wool shirt to the plastic rod.

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Approximately 3.06 × [tex]10^{13[/tex] electrons are transferred from the wool shirt to the plastic rod when it acquires a charge of -4.9 µC.

The charge of one electron is given, and the total charge on the plastic rod is known. The formula to determine the number of electrons n transferred is:

[tex]\[ n = \frac{Q}{e} \][/tex]

First, convert the charge from micro coulombs to coulombs:

[tex]\[ Q = -4.9 \, \mu\text{C} = -4.9 \times 10^{-6} \, \text{C} \][/tex]

Next, use the formula to find the number of electrons:

[tex]\[ n = \frac{Q}{e} = \frac{-4.9 \times 10^{-6} \, \text{C}}{-1.6 \times 10^{-19} \, \text{C}} \][/tex]

Calculate the number of electrons:

[tex]\[ n = \frac{4.9 \times 10^{-6}}{1.6 \times 10^{-19}} \][/tex]

[tex]\[ n = 3.0625 \times 10^{13} \][/tex]

Therefore, the number of electrons transferred from the wool shirt to the plastic rod is approximately [tex]\( 3.06 \times 10^{13} \)[/tex].

Areas near oceans have milder climates than areas in the interior of continents due to the great storage capacity of water.

Areas near oceans have milder climates than areas in the interior of continents because of the great storage capacity of water. Water is able to absorb a tremendous amount of energy with very little resulting temperature change, which leads to more moderate temperatures in coastal areas. The oceans collect and store vast amounts of solar energy and transport that heat with their currents, resulting in smaller temperature variations from day to night and from winter to summer.

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