Physics
- A typical american family uses 1000 kWh of electricity a month. What is the average rms current in the 120 V power line to the house? On average, what is the resistance of a household?
- An object is 15 cm in front of a diverging lens with a focal length of 10 cm. A) Use ray tracing to determine the location of the image B) Is the image upright or inverted? C) Is the image real or virtual?
- To practice Problem-Solving Strategy 23.2 for continuous charge distribution problems. A straight wire of length L has a positive charge Q distributed along its length. Find the magnitude of the electric field due to the wire at a point located a distance d from one end of the wire along the line extending from the wire.
- Two light bulbs have resistances of 400 Ω and 800 Ω. Part APart complete The two light bulbs are connected in series across a 120-V line. Find the current through each bulb. Enter your answers numerically separated by a comma. I400, I800 = 0.100,0.100 A Previous Answers Correct Part BPart complete Find the power dissipated in each bulb. Enter your answers numerically separated by a comma. P400, P800 = 4.00,8.00 W Previous Answers Correct Part CPart complete Find the total power dissipated in both bulbs. P = 12.0 W Previous Answers Correct Part D The two light bulbs are now connected in parallel across the 120-V line. Find the current through each bulb.
- A 75 kg hunter, standing on frictionless ice, shoots a 42 g bullet horizontally at a speed of 620 m/s . Part A What is the recoil speed of the hunter? Express your answer to two significant figures and include the appropriate units.
- What is the magnitude of the line charge density on the power line? Express your answer using two significant figures.
- A beam of particles, each with a charge of 24.0 x 10-19 C, moves at [ (-3.68)i + (6.35)j + (-1.91)k ] x 105 m/s through a uniform magnetic field of [ (-3.05)i + (5.28)j + (-1.09)k ] T. Let F represent the force vector on each particle. What is the i component of F? (include units with answer) What is the j component of F? (include units with answer) What is the k component of F? (include units with answer) What is the magnitude of F? (include units with answer) A uniform electric field of [ (5.94)i + (-3.97)j + (-5.55)k ] x 105 N/C is added to the system. What is the new magnitude of F? (include units with answer)
- Which of the following statements about nuclear energy is true? a. Nuclear energy cannot be contained or controlled. by. Nuclear energy is contained in nuclear bonds. c. Nuclear energy is less efficient than other energy forms. d. All of the above are true.
- Find the orbital speed v of a satellite in a circular orbit of radius r around a planet of mass m.
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calculate the time rate of change in air density during expiration. Assume that the lung has a total volume of 6000mL, the diameter of the trachea is 18mm, the air flow velocity out of the trachea is 20cm/s and the density of air is 1.225kg/m3. Also assume that lung volume is decreasing at a rate of 100mL/s.
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Subject:
Physics -
Author:
janefitzgerald -
Created:
7 months ago
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- A parachute on a racing dragster opens and changes the speed of the car from 95 m/s to 35 m/s in a period of 6.5 seconds. What is the acceleration of the dragster?
- they say what goes up must come down does that mean that all of our intelligence will... is everybody in the future gonna be more and more dumb!
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Cecily is inflating her bicycle tyre with the pump below. When she pushes the plunger down, it is doing work against the gas. This means that the plunger is transferring what to the gas particles?
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Subject:
Physics -
Author:
tiarapollard -
Created:
1 year ago
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Which of the following statements is NOT true about chemical reactions?
A. A chemical reaction produces new substances with different properties.
B. Chemical reactions result in products that have characteristics that are not the same as the reactants.
C. During chemical reactions, chemical bonds break and/or new bonds form.
D. When a chemical reaction releases energy, it is an example of an endothermic reaction.
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Subject:
Physics -
Author:
first mateue1c -
Created:
7 months ago
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- S m On a frictionless toy race track, a 0.035 kg toy car moving right at 0.30 collides with another 0.040 kg toy m car moving left at 0.20 After the collision, the 0.035 kg car moves left at 0.20 S m S What is the final speed of the 0.040 kg toy car?
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The diagram shows the molecular structure of propane. What is the chemical
formula for propane?
Propane
H H H
1
H-C-C-C-H
HHH
A. 3CHE
B. CzHs
C. CzH2
D. 3H2C3H3
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Subject:
Physics -
Author:
francesc0nxg -
Created:
8 months ago
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Uranus requires 84 years to circle the sun. Find uranus's average distance from the sun as multiple of earth's average distance from the sun
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Subject:
Physics -
Author:
isabelle13 -
Created:
8 months ago
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- To launch a ball, a pinball machine compress a spring 4.0 cm. The spring constant is 13 N/M. What is the force of the spring on the ball when the spring is released?
- Which can be observed both on Earth and in an accelerating ship in space that is free from the effect of any gravitational field? Check all that apply. chairs floating in midair apples falling from trees people's feet touching the ground sky divers moving toward the groundballs bending downward after being thrown
- Protons and neutrons are located in the nucleus of the atom. Please select the best answer from the choices provided T F
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The function of the ossicles in the middle ear is to transmit the vibrations of the tympanic membrane caused by sound waves propagated in air to the fluid-filled cochlea. In doing so, the ossicles change the nature of the vibrations. The ear tries to conserve the energy in the wave I,
where v is the wave speed, cramster-equation-2010731130406341613664 is the density of the medium, cramster-equation-2010731131286341613668 is the frequency of the wave and A is the amplitude of the wave.
Calculate the magnitude of the change in A that occurs. The density of air and water is 1.3x10–3g/cm3 and 1.0g/cm3, respectively, and the velocity of sound is 331 m/s in air and 1410 m/s in water. The frequency of the wave remains constant as the wave propagates. (Hint: Begin with to find .)
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Subject:
Physics -
Author:
pixie stick -
Created:
8 months ago
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a shopping bag can provide an upward force of 65N before breaking. A shopper puts 5 kg of groceries in the bag. If the shopper tries to lift the bag with an upward acceleration of 2 m/s/s, will the bag break?
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Subject:
Physics -
Author:
borismendoza -
Created:
1 year ago
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- A 330.-ohm resistor is connected to a 5.00-volt battery. What is the current through the resistor?
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A heavy box with a square base and a height twice the length of a side is to be transported by a lorry. Explain how the stability of
i the lorry
ii the box
will be affected if the box lies on its side in the van rather than its base.
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Subject:
Physics -
Author:
amadeoyoung -
Created:
1 year ago
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A 50 g bullet moving horizontally at a velocity of 400 m/s collides and embeds itself in a 25 kg block that rests on a rough horizontal surface and is attached to a spring with a spring constant of 180 N/m. The impact causes a compression of 12 cm in the spring. What is the coefficient of friction between the block and the surface?
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Subject:
Physics -
Author:
hildegarda -
Created:
1 year ago
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