Physics

what happens to the energy waves as they pass through the valley and reach the mountain? what type of material do you expect to find in valleys
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suppose we see the spectral lines to a distant star doppler shifted to smaller wavelengths. what does this tell us about the star's motion?
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suppose you take off in a car with your physics book on top. if you are accelerating forward and the book rides with you, in what direction does friction act on the book
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c. what will be the charges of the spheres in fractions of after connection? how does the total charge of the two spheres after the connection compare to the initial charge of the left sphere?
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suppose the frequency of a note on an organ is 15 hz. what is the shortest organ pipe with both ends open that will resonate at this frequency? the velocity of sound in air is 343 m/s. answer in units of m.
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europa, one of the moons of jupiter, was discovered by galileo in 1610. europa has a circular orbit of radius 6.708 105 km and period 3.551 days. find the mass of jupiter.
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what fraction of the engine power is being used to make the airplane climb? (the remainder is used to overcome the effects of air resistance and of inefficiencies in the propeller and engine.)
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two objects collide and stop. their kinetic energy becomes sound energy. when does the energy stop being sound energy?
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a hard drive rotates at 7200 rpm. the disk has a diameter of 5.1 in 13 cm. what is the speed of a point 6.0 cm. from the center axle? what is the acceleration of this point on the disk.
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on june 9, 1988, sergei bubka broke the world pole-vaulting record for the 8th time in four years by attaining a height of 6.10 m. how long did it take bubka to return to the ground from the highest part of his vault?
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time dilation. a. a clever student, after learning about the theory of relativ?ity, decides to apply his knowledge in order to prolong his life. he decides to spend the rest of his life in a car, trave?ling around the freeways at 55 miles per hour (89 km/hr). suppose he drives for a period of time during which 70 years pass in his house. how much time will pass in the car? (hint: if you are unable to find a difference, be sure to explain why.) b. an even more clever student decides to prolong her life by cruising around the local solar neighborhood at a speed of 0.95c (95% of the speed of light). how much time will pass on her spacecraft during a period in which 70 years pass on earth? will she feel as if her life span has been extended? explain. c. suppose you stay home on earth while your twin sister takes a trip to a distant star and back in a spaceship that travels at 99% of the speed of light. if both of you are 25 years old when she leaves and you are 45 years old when she returns, how old is your sister when she gets back?
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why do the phases of venus show that the solar system is in a heliocentric model instead of a geocentric model?
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a) What is the y component of the vector given in the diagram? (120 N, 50 ) 120 N 50 (C) 60 N (B) 92 N (D) 120 N (A) 77N
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calculate the efficiency of an electric motor which uses 7.4kJ of energy to lift a 34kg object 11m
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a light plane must reach a speed of 35 m/s for takeoff. how long a runway is needed if the (constant) acceleration is 3.0 m/s^2?
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how much charge does a 9.0 v battery transfer from the negative to the positive terminal while doing 45 j of work? express your answer to two significant figures and include the appropriate units.
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when you look into a mirror, what is happening to the light?
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if the frequency of the incoming light is decreased, will the energy of the ejected electrons increase, decrease, or stay the same?
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4. An object experiences an acceleration of 6.8 m/s. As a result, it accelerates from rest to 24 m/s. Howmuch distance did it travel during that acceleration?
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besides changing the distance between the plates and area of the plates, another way to alter the capacitance is by filling the space between the plates with dielectric material. doing this will reduce the electric field between the plates. considering the relationship between electric field and voltage (potential difference), and between capacitance and voltage, filling the empty (vacuum) space between a capacitors plates group of answer choices will increase the capacitance of the capacitor. will have no effect on the capacitance of the capacitor. will reduce the capacitance of the capacitor. may increase or reduce the capacitance of the capacitor.
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how close would the masses 0.510 kg and 0.108 kg have to be in order for the gravitational force between them to have a magnitude of 1.03 n?
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suppose an asteroid had an orbit with a semimajor axis of 4 au. how long would it take for it to orbit once around the sun? question 28 options: 2 years 4 years 8 years 16 years
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what is the speed of a proton that has been accelerated from rest through a potential difference of -800 v ?
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in another universe where the speed of light is only 100 m/s, an airplane that is 45 m long at rest and flies at 320 km/h will appear to be how long (in m) to an observer at rest?
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