Physics

Why was it important that dr. Jeff use a large ball to represent the sun a marble to represent the earth and a bead to represent the moon in his model
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A sound source emits 20.0 w of acoustical power spread equally in all directions. the threshold of hearing is 1.0 10-12 w/m2. what is the sound intensity level 30.0 m from the source?
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A crane in a marble quarry is mounted on the rock walls of the quarry and is supporting a 2000 kg slab of marble. The center of mass of the 900 kg boom is located one-third of the way from the pivot end of its 15-m length, and the cable supporting the boom is attached at 10. 0 m from the pivot end. What is the tension in the cable supporting the boom? g
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1. A boy moves on a skateboard at a constant velocity of 3 m-s-'. Thecombined mass of the boy and the skateboard is 40 kg. He catches a bag offlour of mass 5 kg that is thrown to him horizontally at 6 m-s-!. Determinethe velocity of the boy after catching the bag of flour. (2 m-s ' in his originaldirection)
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I need help on this one question in scienceThis image of a tiny fraction of the night sky was taken through a powerful telescope. Many of the objects seen in the image are galaxies similar to the Milky Way. Telescopes have taken many images like this one, but of different fractions of the night sky. What do these images suggest? A. Each galaxy contains an equal number of stars. B. The Milky Way is the largest galaxy in the Universe. C. There are no other galaxies in the Universe. D. There are many other galaxies in the Universe
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a single-turn current loop, carrying a current of 4.00 a, is in the shape of a right triangle with sides 50.0, 120, and 130 cm. the loop is in a uniform magnetic field of magnitude 75.0 mt whose direc- tion is parallel to the current in the 130 cm side of the loop. what is the magnitude of the magnetic force on (a) the 130 cm side, (b) the 50.0 cm side, and (c) the 120 cm side? (d) what is the magnitude of the net force on the loop?
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Which of these typically have the largest orbit? Earth Mars Meteors Comets
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A student carries a 0. 5kg water balloon from the first floor to the fourth floor, a distance of 15m. If she drops it out the window, how much kinetic energy will it have when it reaches the first floor?
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What is the frequency of a light wave with a wavelength of 6. 0 10^7 meter traveling through space? Please explain. A) 5. 0 10^14 HzB) 5. 0 10^1 HzC) 2. 0 10^15 HzD) 1. 8 10^14 Hz
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Use your data to predict what a 400g bag would weigh
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ASAP!! Can someone help me with this? I put the attachment below.
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Which of the following would be the best way to find experimental evidence of the different types of materials that condensed as a function of distance from the sun during the period of accretion in the solar nebula?.
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Two ice skaters, starting from rest, hold onto the ends of a 10 m pole. A 40-kg player is at one end of the pole and a 60-kg player is at the other end. The players then start pulling themselves along the pole towards each other while sliding without friction on the ice. If the two skaters continue past each other after they meet, what distance will the 60-kg player have moved with respect to the ice when the skaters have exchanged positions with respect to each other?.
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A 16-bit periodic count-down timer uses a clock source of 2khz and clock divider of 2, choose proper options forhow much is the frequency of the clock that feeds the counter inside this timer? [ select ] ["1 khz", "1 ms", "2 khz", "0.5 ms"]what is the largest load value for this timer? [ select ] ["2^16 - 1", "2^16", "2^16 + 1"]based on the answer to part 2, approximately, how long is the longest period for this periodic timer? [ select ] ["65.536 s", "0.5 ms", "1 ms", "(2^16) s"]assume the load value is set at 999 and no rollover has happened between events, e1 and e2. if the counter reading (the value inside the counter) for the two events, c1 and c2, are 550 and 200, how long has elapsed between the two events? [ select ] ["350 ms", "350 sys clock cycles"]assume the load value is 9999. once an event, e1, happens, the light should turn on and stay on for 3 seconds. if the counter value when e1 happens is 2000 and we immediately turn on the light, what should be the counter value when we have to turn off the light (after 3 seconds)?
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An object vibrates with a frequency of 2200 Hz to produce sound waves that travel through air with a speed of 340 m/s. Adjacent compressions (i.e., wavelengths) in the sound wave are a distance of meters apart.
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A 66-kg skier speeds down a trail, as shown in (Figure 1). The surface is smooth and inclined at an angle of 22 with the horizontal.A)Complete the free-body diagram by adding the forces that act on the skier.Draw the vectors with their tails at the black dot. B)Determine the normal force acting on the skier. Express your answer in newtons.
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3) if tom cruise (red bike rider) is more massive than the other actor, which person has more momentum in mid-air? explain.4) if the total momentum of both riders added together is 2400 kgm/s before they collide, what is their total momentum after they collide? explain how you know that?5) is this collision elastic or inelastic? explain how you know.6) if tom is more massive and stronger than the other actor, compare the forces that they exert on each other when they collide. explain.7) what would this scene look like if it were done in space? what would be the same? what would be different? be sure to answer using the appropriate physics word (see top of page)
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Which characteristic of the moon made it the best choice for the first manned space missions instead another celestial body like mars?.
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When training for muscular endurance, how should the athlete alter the number of repetitions he or she performs in anexercise?O More reps should be executed.O Fewer reps should be executed.O Raising or lowering the number should depend on the exercise and goals.O The number of reps should not be changed.
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HELP!!! You have two substances, both of which have the same boiling point (or attraction between their molecules).The first substance is made from molecules that are small (just a few atoms bonded together), and the second substance is made from mol that are larger (many atoms bonded together).How can it be possible for two such different molecules to yield substances with the same boiling point? Describe the kinds of intermolecu attractions that must be involved and any other properties of the molecules that could cause this result.
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15. True or flase: Condensation is the change of state from a liquid to a gas.._______16. For a gas to become a liquid, large numbers of particles must clump together.Particles clump together when the attraction between thm overcomes their_________
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A candy distributor needs to mix a 20% fat-content chocolate with a 60% fat-content chocolate to create 100 kilograms of a 52% fat-content chocolate. How many kilograms of each kind of chocolate must they use?
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An individual receives frequent injections of drugs, which are administered in a small examination room at a clinic. The drug itself causes increased heart rate but after several trips to the clinic, simply being in a small room causes an increased heart rate
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describe what the weather would be like as a warm front passes, then describe what would occur as a cold front passes.
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