A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 25.0 kg,25.0 kg, travels ?=6.50 md=6.50 m up the conveyor belt at a constant speed without slipping.

If the conveyor belt is inclined at an angle ?=50.0∘,θ=50.0∘, calculate the work done on the bag by

• the force of gravity (?g)(Wg)
• the normal force (?N)(WN)
• the friction force (?f)(Wf)
• the conveyor belt (?conveyor)(Wconveyor)
• the net force (?net)(Wnet)

Match the work done by each force to the appropriate energy value.

1590 J1590 J1220 J1220 J−1590 J−1590 J−1220 J−1220 J0 J0 J1020 J1020 J−1020 J−1020 J

?fWf

?conveyorWconveyor

?gWg

?NWN

?netWnet

Answer Bank

Now that the turkey has been in the oven for quite some time, it is now time to get the gravy ready. First, you will need to put a circular aluminum sauce pan with a 12-cm diameter and a thickness of 8-mm on the stovetop and turn on the burner. Now you 120-gram mix the gravy contents with 360-grams of water. Assume that the latent heat of evaporation for gravy is similar to that of water, which is ?v=2260 KJ/Kg and that the thermal conductivity constant for aluminum is 220 J/s*m*°c

a) If the rate electric stove top has a heat transfer rate of 2.3 kW, solve for the temperature difference across the bottom of the aluminum pan.

b) Suppose the gravy reaches a boiling point at 100°C. How long will it take all of the gravy to completely “evaporate” if it behaved like water.

Create and present a hypothesis of why you believe the Milky Way looks the way it does. Formulate a method to test this to create a theory. Whose theory (if any) supports this concept and description?  Formulate and present your own theory of why you believe the galaxy looks the way it does. Be sure to provide support for your theory.

An ideal monatomic gas is contained in a vessel of constant volume 0.210 m3. The initial temperature and pressure of the gas are 300 K and 5.00 atm, respectively. The goal of this problem is to find the temperature and pressure of the gas after 13.0 kJ of thermal energy is supplied to the gas. (a) Use the ideal gas law and initial conditions to calculate the number of moles of gas in the vessel. mol (b) Find the specific heat of the gas. J/K (c) What is the work done by the gas during this process? kJ (d) Use the first law of thermodynamics to find the change in internal energy of the gas. kJ (e) Find the change in temperature of the gas. K (f) Calculate the final temperature of the gas. K (g) Use the ideal gas expression to find the final pressure of the gas. atm

In the energy level diagram shown below, the energy difference between States 3 and 4 is half the energy difference between states 2 and 3. An electron undergoes a transition (a quantum \"leap\") from State 4 to State 3 resulting in the emission of a photon having a wavelength of 660 nm. (Note: 1 nm = 10^-9 m.)

What is the frequency the emitted photon resulting from an electron making a transition from State 4 to State 3.

f_{4 to 3} =

What is the frequency the emitted photon resulting from an electron making a transition from State 3 to State 2.

f_{3 to 2} =

What is the wavelength of the photon that is emitted when an electron makes a transition from State 3 to State 2?

λ_{3 to 2} =

What are the frequency and wavelength of a photon that is emitted when an electron makes a transition from State 4 to State 2?

f_{4 to 2} =

λ_{4 to 2} =

The energy difference between States 1 and 2 is five times the energy difference between States 3 and 4. What are the frequency and wavelength of a photon that is emitted when an electron makes a transition from State 4 to State 1?

f_{4 to 1} =

λ_{4 to 1} =

Chapter #14

Question #12,

The value of specific heat for copper is 390 J/kg⋅C∘, for aluminun is 900 J/kg⋅C∘, and for water is 4186 J/kg⋅C∘.
Part A
What will be the equilibrium temperature when a 265 g block of copper at 255 ∘C is placed in a 155 g aluminum calorimeter cup containing 865 g of water at 12.0 ∘C?
Express your answer using three significant figures.

T =  

Question #13

High-altitude mountain climbers do not eat snow, but always melt it first with a stove. To see why, calculate the energy absorbed from a climber's body under the following conditions. The specific heat of ice is 2100 J/kg⋅C∘, the latent heat of fusion is 333 kJ/kg, the specific heat of water is 4186 J/kg⋅C∘.
Part A
Calculate the energy absorbed from a climber's body if he eats 0.85 kg of -15∘C snow which his body warms to body temperature of 37∘C.
Express your answer to two significant figures and include the appropriate units.

Q1 =  
Part B
Calculate the energy absorbed from a climber's body if he melts 0.85 kg of -15∘C snow using a stove and drink the resulting 0.85 kg of water at 2∘C, which his body has to warm to 37∘C.
Express your answer to two significant figures and include the appropriate units.

Q2 =  

An athlete at the gym holds a 2.0 kg steel ball in his hand. His arm is 70 cm long and has a mass of 4.0 kg .

What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?

What is the magnitude of the torque about his shoulder if he holds his arm straight, but 35 degrees below horizontal?

Q1) in the helium atom as a gas containing two electrons two protons and two neutrons:

the Answer: 6 top quark and 6 bottom

How we get this answer and show me the steps Pleas ,,,,, Thanks

A 0.112-kg block is suspended from a spring. When a small pebble of mass 31 g is placed on the block, the spring stretches an additional 5.5 cm. With the pebble on the block, the block oscillates with an amplitude of 11 cm. Find the maximum amplitude of oscillation at which the pebble will remain in contact with the block.

Aldo and his brother Pablo have gone to skate to a frozen lagoon. At one point he stops to open his lunch, when he observes that Pablo is approaching directly towards him with a speed V0. Before the impact, Aldo throws his brother the lunch package in the horizontal direction which is caught by Pablo in the air. If both brothers have the same mass M and the mass of the package is m, calculate the minimum value of how quickly Aldo should throw the package so that his brother Pablo does not clash with him.

A proton with initial wavelength the same as compton wavelength scatters off an electron( initially at rest) and bounces back. find the final energy, kinetic energy, and recoil speed.

What is the schrondigers cat theory?

A particle of charge +9.6 μC is released from rest at the point x = 61 cm on an x axis. The particle begins to move due to the presence of a charge Q that remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 21 cm if (a)Q = +66 μC and (b)Q = –66 μC?

A circuit consists of an 92- resistor in series with a 5.9-?F capacitor, the two being connected between the terminals of an ac generator. The voltage of the generator is fixed. At what frequency is the current in the circuit one-half the value that exists when the frequency is very large? Note: The ac current and voltage are rms values and power is an average value unless indicated otherwise

4.

Part B

Calculate the focal length of the eyepiece lens.

Express your answer to two significant figures and include the appropriate units.

Part C

Calculate the focal length of the objective lens.

Express your answer to three significant figures and include the appropriate units.

Part D

Where the object must be for a normal relaxed eye to see it in focus?

Express your answer to three significant figures and include the appropriate units.