Which object has particles with the most kinetic energy?
A. A crushed aluminum can at room temperature
B. An empty aluminum can sitting in a burning campfire
O C. An open aluminum can left overnight in a freezer
O D. A sealed aluminum can stored in a cooler full of ice

Answer:

When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Answer:

ω = 0.05 rad/s

Explanation:

In order to produce the acceleration equal to the acceleration due to gravity at the surface of Earth, the centripetal acceleration must be equal to the value  of g:

[tex]a_c = g\\g = \frac{v^2}{r}\\\\but,\ v=r\omega\\therefore,\\\\g = \omega^2r\\\\\omega = \sqrt{\frac{g}{r}}[/tex]

where,

ω = angular speed = ?

g = acceleration due to gravity on the surface of the Earth = 9.81 m/s²

r = radius of cylinder = 8 km/2 = 4 km = 4000 m

Therefore,

[tex]\omega = \sqrt{\frac{9.81\ m/s^2}{4000\ m}}[/tex]

ω = 0.05 rad/s

Answer: Heat energy is transferred from warmer objects to cooler objects.

Explanation:

Answer:

Note that the angle of lap is 165 degrees at the question above

So the power (kW) transmitted when the belt runs at 13 m/s and centrifugal force is included = 3.79782kW

Explanation:

Centrifugal force, Fc = pAv^2

Where p = density, A = c.s.a.  v = veelocity

= 11x100 kg/m3 X 4x100 mm2 X (13 m/s)^2

= 1100 kg/m3 X 400 mm2 x 10^-6 X 169m/s

= 74.36N

P v (f - Fc) (1-e^-μθ)

The θ = (165 degrees ÷ 180 degrees) X π = 2.878 rads  (π = 3.14)

So power p, = 10 (637 N - 74.36N) (1 - e^-0.39 x 2.878)

= 10 X 562.64 X 0.675

P = 3797.82 watts = 3.79782kW

Answer: 326m

Explanation:

To find the the wavelength of the radio waves, we can use the equation:

Wavelength = c/f

where,

c = 3 × 10^8 m/s

f = 920 × 10^3 kHz

Wavelength = 3 × 10^8 / 920 × 10³

Wavelength = 326.08696

Wavelength = 326m

Answer:

upward

Explanation:

In the electromagnetic system of force if the direction of motion of proton does not changes it means that the electric and magnetic forces are such a ways that they are cancelling each other's effect.

Since, electric field lines will exert a force on the proton to the west, hence, the magnetic force must force it to the east. It is well known that magnetic force acts perpendicular to the direction of magnetic field.  magnetic field should point upward direction.

Answer:

Option A

Explanation:

In this experiment, when balloon is rubbed on the chair electrons are transferred from the hair to the surface of the balloon thereby making balloon negatively charged and hair positively charged. When two negatively charged balloon are brought close to each other, they repel while when balloon is brought closer to the hair, they attract each other

Hence, option A is correct

Answer:

C: A snow sled going down hill

Answer:

1 ohm is equal to one volt (V)/ one ampere (1A) 1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows. Ohms is the SI unit of electrical resistance.

Explanation:

I hope it's help u

Answer: 2 hr 45 min

Explanation:

Given

The average speed between San Diego and Los Angeles is [tex]105\ kmph[/tex]

time taken for this trip is  [tex]1\ hr\ 50\ min\ or\ \frac{11}{6}\ hr[/tex]

Distance between San Diego and Los Angeles is

[tex]\Rightarrow d=105\times \dfrac{11}{6}\\\\\Rightarrow d=192.5\ km[/tex]

For Friday afternoon, the average speed is  [tex]70\ km/h[/tex]

time taken to complete the trip is

[tex]\Rightarrow t=\dfrac{192.5}{70}\\\\\Rightarrow t=2.75\ hr\ or\ 2\ hr\ 45\ min[/tex]

Answer:

A.) 1658 nm

B.) 1.05 ev

Explanation:

Given that in a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure the maximum kinetic energy of the photoelectrons to be 0.75 eV. Then you illuminate the same metal with light of a wavelength known to be 2/3 of the first wavelength and measure a maximum kinetic energy of 1.8 eV for the photoelectrons.Required:

a. Find the first wavelength, in nanometers

The formula to use is:

E = hf

Where f = c/ wavelength.

C = speed of light.

Convert the electron volts to Joule.

0.75 × 1.6 × 10^-19 = 1.2 × 10^-19 J

Substitute the values into the formula

1.2 × 10^-19 = (6.63 × 10^-34 × 3 × 10^8) ÷ wavelength

Wavelength = (6.63×10^-34 × 3×10^8) ÷ 1.2×10^-19

Wavelength = 1.6575 × 10^-6 m

Therefore, the wavelength of the first light in nanometers will be

Wavelength = 1658 nm

b. Find the metals work function, in electron volts

The metal works function will be:

WF = 1.8 - 0.75 = 1.05 eV

Answer:

electromagnetic waves, physical contact

Explanation:

The sun transfers heat to earth through electromagnetic radiation. This method of heat transfer is evidence that direct contact is not necessary for heat to move from place to place.

Heat transfer is defined as the flow of heat or thermal energy from one point to another due to the temperature difference between the two points.

Here,

Due to the temperature difference between, heat transfer occurs between two points through various methods such as conduction, convection and radiation.

Conduction is the process of heat transfer through which heat is transferred between two objects that are in direct contact with each other. It can occur in solids, liquids and gases.

Convection is the process of heat transfer through which the heat is transferred by the movement of fluids. Air and water currents are the examples for it.

Radiation is the process of heat transfer in which the heat is transferred in the form of electromagnetic waves.

The heat energy from the sun reaches the earth through the phenomenon called electromagnetic radiation. Mainly infrared radiations carry the heat towards earth.

Unlike conduction and convection, radiation does not require any matter to transfer the heat energy.

Hence,

The sun transfers heat to earth through electromagnetic radiation. This method of heat transfer is evidence that direct contact is not necessary for heat to move from place to place.

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Answer:

A. Increases

Explanation:

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Answer:

Impulse = -5.177 Ns

Explanation:

Given the following data;

Mass = 0.145-kg

Velocity = 35.7 m/s

To find the Impulse to stop the baseball;

Now, we would find the change in velocity.

[tex] Change \; in \; velocity = final \; velocity - initial \; velocity [/tex]

Substituting into the equation above;

Change in velocity = 0 - 35.7 = -35.7m/s

[tex] Impulse \; of \; force = mass * change \; in \; velocity [/tex]

Substituting into the formula, we have;

Impulse = 0.145 * -35.7

Impulse = -5.177 Ns

Nite: Since it's working to stop the ball, it would be negative.

Answer:

Explanation:

This question comes from Conservation of Momentum

M1=2000kg

U1=34.1ms^-1

Now this truck crashes into a stationary corolla

Since its stationary

U2=0

M2=1100kg

The Moving Truck came to a complete stop(or rest)

Its Final Velocity V1=0

Mass still remains the same

The corolla will move with a speed V2

Applying the formula for conversation of Momentum

M1U1 + M2U2 = M1V1 + M2V2

2000(34.1) + 1100(0) = 2000(0) + 1100(V2)

2000(34.1) = 1100(V2)

V2 = 2000(34.1)/1100

V2 =62ms^-1

Answer: the wavelength increases

Explanation:

Answer:

B) methane gas

Explanation:

A p e x

Answer:

Enlarged [Size]

Virtual and Erect [Nature]

On the same side of the lens as the object [Position]

Explanation:

Answer:

The distance moved by the block is 1.34 m

Explanation:

Given;

initial velocity of the block, u = 3 m/s

angle of inclination, θ = 20⁰

The net horizontal force acting on the block;

∑Fx = - mgsinθ

Apply Newton's second law of motion, to determine the constant acceleration of the block.

∑Fx = ma

- mgsinθ = ma

-gsinθ = a

Apply the following Kinematic equation, to determine how far up, the block moved before coming to rest.

[tex]V_f^2 = V_i^2 + 2a(x_f -x_i)\\\\0 = V_i^2 + 2[-gsin \theta(x_f-0)]\\\\0 = V_i^2 - 2gsin \theta(x_f)\\\\ 2gsin \theta(x_f) = V_i^2\\\\x_f = \frac{V_i^2}{2gsin \theta} = \frac{(3)^2}{2 \ \times \ 9.8 \ \times \ sin(20)} = 1.34 \ m[/tex]

Therefore, the distance moved by the block is 1.34 m

The resistance force of the water exerted on the whale is 19305 Newton.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Power = 150 kW = 150,000 Watt.

Constant speed = 7.77 m/s.

Now, Power = the resistance force × speed

150000 Watt =  the resistance force × 7.77 m/s

Hence, the resistance force = 150000 Watt/ 7.77 m/s

= 19305 Newton.

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Answer:

The correct answer is B. Strong Nuclear.

Explanation:

An atom contains protons, neutrons, and electrons. The nucleus of an atom consists of bound protons and neutrons (nucleons). The negatively charged electrons are attracted to the positively charged protons and fall around the nucleus, much like a satellite is attracted to the gravity of the Earth. The positively-charged protons repel each other and aren't electrically attracted or repelled to the neutral neutrons, so you may wonder how the atomic nucleus sticks together and why protons don't fly off.

The explanation for why protons and neutrons stick together is known as "the strong force." The strong force is also known as the strong interaction, color force, or strong nuclear force. The strong force is much more powerful than the electrical repulsion between protons, however, the particles have to be close to each other for it to stick them together.

Answer:

Italian astronomer Galileo Galilei provided a number of scientific insights that laid the foundation for future scientists. His investigation of the laws of motion and improvements on the telescope helped further the understanding of the world and universe around him.Nov 14, 2017

Explanation:

Answer:

Alternating voltage leads to electromagnetic induction which is necessary for the transformer to work.

Explanation:

According to Oxford dictionary; an alternating current is "an electric current that reverses its direction many times a second at regular intervals".

A transformer works on the principle of electromagnetic induction. A transformer requires an alternating current which can create a changing magnetic field leading to induced voltage in the coil.

Hence, a transformer requires alternating voltage because alternating voltage leads to electromagnetic induction which is necessary for the transformer to work.

Answer:

The mass of the juice responsible for melting the ice is 949.043 grams.

Explanation:

By the First Law of Thermodynamics, we understand that juice releases heat to the ice, which turns into water under the assumption that interactions between the ice-juice system and surroundings are negligible and energy processes are done in steady-state. Since juice is done with water, its specific heat will be taken as of the water. The process is described by the following formula:

[tex]m_{i} \cdot [c_{i}\cdot (T_{1}-T_{2}) - L_{f} + c_{w}\cdot (T_{2}-T_{3})] + m_{w} \cdot c_{w}\cdot (T_{4}-T_{3}) = 0[/tex] (1)

Where:

[tex]m_{i}[/tex] - Mass of ice, in grams.

[tex]m_{w}[/tex] - Mass of the juice, in grams.

[tex]c_{i}[/tex] - Specific heat of ice, in joules per gram-degree Celsius.

[tex]c_{w}[/tex] - Specific heat of water, in joules per gram-degree Celsius.

[tex]L_{f}[/tex] - Latent heat of fusion, in joules per gram.

[tex]T_{1}[/tex] - Initial temperature of ice, in degrees Celsius.

[tex]T_{2}[/tex] - Melting point of water, in degrees Celsius.

[tex]T_{3}[/tex] - Final temperature of the ice-juice system, in degrees Celsius.

[tex]T_{4}[/tex] - Initial temperature of the juice, in degrees Celsius.

If we know that [tex]m_{i} = 100\,g[/tex], [tex]c_{i} = 2.090\,\frac{J}{g\cdot ^{\circ}C}[/tex], [tex]c_{w} = 4.18\,\frac{J}{g\cdot ^{\circ}C}[/tex], [tex]L_{f} = 334\,\frac{J}{g}[/tex], [tex]T_{1} = -10\,^{\circ}C[/tex], [tex]T_{2} = 0\,^{\circ}C[/tex], [tex]T_{3} = 10\,^{\circ}C[/tex] and [tex]T_{4} = 20\,^{\circ}C[/tex], then the mass of the juice is:

[tex]m_{w} = \frac{m_{i}\cdot [c_{i}\cdot (T_{1}-T_{2}) - L_{f} + c_{w}\cdot (T_{2}-T_{3})]}{c_{w} \cdot (T_{3}-T_{4})}[/tex]

[tex]m_{w} = \frac{(100\,g)\cdot \left[\left(2.090\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C) - 334\,\frac{J}{g} +\left(4.18\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C) \right]}{\left(4.180\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C)}[/tex]

[tex]m_{w} = 949.043\,g[/tex]

The mass of the juice responsible for melting the ice is 949.043 grams.

Answer:

a. ε = 21,014sin(120πt) V

b. 0.476cosec(120πt)  

Explanation:

a. Induced emf

We know the induced emf, ε = -dΦ/dt where Φ = magnetic flux through coil = NABcosθ where N = number of turns of coil =, 100, A = area of coil = 10 ft × 6 ft = 60 ft² = 60 × 1 ft² = 60 × (0.3048)² m² = 5.574 m², B = magnetic field strength = 0.1 T and θ = angle between B and normal to A = ωt.

So, Φ = NABcosθ = 100 × 5.574 m² × 0.1 T cosθ  = 55.74cosθ Tm²

So, ε = -dΦ/dt = ε = -d(55.74cosθ Tm²)/dt = -d(55.74cosθ Tm²)/dθ × dθ/dt = -55.74 ×(-sinθ) Tm²)/dθ × ω (ω = dθ/dt = angular frequency of shaft = 2πf where f = frequency of rotor = 60 Hz )

ε = 55.74sinθ Tm²) × 2πf

ε = 55.74sinθ Tm²) × 2π(60 Hz)

ε = 6689πsinθ V

ε = 21,014sinθ V

ε = 21,014sinωt V

ε = 21,014sin(2πft) V

ε = 21,014sin(2π(60 Hz)t) V

ε = 21,014sin(120πt) V

b. Current in coil

Since power P = Iε where I = current and ε = induced emf = 21,014sinθ V.

Since power, P = 10 kW = 10000 W

I = P/ε

= 10000 W/21,014sinθ V

= 0.476/sinθ

= 0.476cosecθ

= 0.476cosecωt

= 0.476cosec(120πt)  

The maximum current is obtained when θ = 90°

I =  10000 W/21,014sin90 V

I = 10000 W/21,014 V

I = 0.476 A

I = 476 mA