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A proton is traveling horizontally to the right at 5.00×106 m/s . |
Find (a)the magnitude and (b) direction of the weakest electric field that can bring the proton uniformly to rest over a distance of 3.40 cm .
a. E =___N/C
b.∘ counterclockwise from the left direction
c. How much time does it take the proton to stop after entering the field?
d. What minimum field ((a)magnitude and (b)direction) would be needed to stop an electron under the conditions of part (a)?
∘ counterclockwise from the left direction
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Briefly explain the diffraction of a circular aperture. Draw a rough sketch showing a circular aperture and the fringes on the screen. What type of fringes do you expect? Is the central fringe bright or dark?
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A 0.74-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar hits the river below, its speed is 25 m/s, and the emf induced across its length is 7.9 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north, (a) determine the magnitude of the horizontal component of the Earth's magnetic field, and (b) state whether the east end or the west end of the bar is positive.
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compare the intensity of a 100 W light bulb while you are reading a book to the intensity of the sun. what assumptions were made ?
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a.) A particular patch of a vegetable oil (n=1.30) floating in water (n=1.33) is 530 nm thick. What is the longest wavelength which will undergo constructive interference on reflecting from the surface?
b). For a particular application, you want to apply an anti-reflective coating to glasses which will minimize reflection of green light with a wavelength of 550 nm. The index of refraction is ncoat= 1.30, and it will be applied on glass with index of refraction of nglass= 1.50. If you want the coating to be as thin as possible, how thick should be?
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examples of the thermodynamics and its laws.
- Where do we use these laws?
- The textbook talks about Heat Pumps, Refrigerators, and so on. Can you come up with some of its uses?
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Max travels to the star proxima centauri 4.2ly away and returns immediately. He claims that the entire trip took just 8 years. How fast did he travel ? ( special relativity)
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An infinite plane slab of thickness 2H has a uniform charge density p , where z is defined to be at the center of the slab. In the z direction, the slab extends from z = -H to z = +H. Find the electric field both inside and outside the slab. (Hint: Outside the slab, Qenc does not depend on z anymore.)
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Gayle runs at a speed of 3.95 m/s and dives on a sled, initially at rest on the top of a frictionless snow-covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 45.0 kg, the sled has a mass of 5.40 kg and her brother has a mass of 30.0 kg.
_________. m/s
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Ruthenium-106 (106Ru) is used to treat melanoma in the eye. This isotope decays by ?
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A star has a surface temperature of 10,000 Kelvin and a radius 3 times that of the Sun. If the apparent magnitude of the star is 11.5, what is the distance to it?
If someone could show me step by step how to do this, I would be
very appreciative.
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Create an equation for the velocity of a particle at any time t, stating the initial position, which cannot equal 0. The equation must include all of:
• Rational function
• Trigonometric function
a. Determine, using appropriate sums of rectangles, an over and under estimation of the displacement of the particle in the first 10 seconds. i. Explain how this estimation could be made more exact.
b. Determine the exact displacement of the particle for the first 10 seconds, and then determine the exact location of the particle after 10 seconds.
c. Determine the average acceleration of the particle from 0. Illustrate how your answer could have been determined by the graphs.
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[Typed answers please]
1. Write a paragraph explaining why Seasons occur on the Earth.
2. In a short paragraph, explain how Newton’s Law of Gravity depends on mass and distance. Don’t just write the equation; explain what the equation means and give some simple numerical examples. 3. What is mass, and how does it differ from weight? Write a paragraph.
4. List Kepler's Laws of Planetary Motion and briefly explain what each means.
5. In a paragraph, describe at least two of the telescopic observations made by Galileo which supported the Sun-centric Copernican model of the Solar System.
6. What is retrograde motion of planets and how does the Copernican model of the solar system explain this apparent motion? Write a paragraph.
7. What is parallax, and why did the apparent absence of stellar parallax lead the Greeks to believe that the Earth must be stationary? Write a parargraph.
8. Write a paragraph describing the two ‘main powers’ of telescopes. Explain why it is useful for astronomers to build bigger and bigger telescopes.
9. What are emission and absorption line spectra? Write a paragraph explaining what they are and why they are important to astronomy.
10. Write a paragraph explaining why astronomers sometimes need to put telescopes in space in order to do their science.
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