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A boat sails along the shore. To an observer, the boat appears to move at a speed of 11 m/s, and a man on the boat walking forward appears to have a speed of 12.4 m/s. How long does it take the man to
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When a driver presses the brake pedal, his car can stop with an acceleration of -5.4 m/s^2. How far will the car travel while coming to a complete stop if its intial speed was 25 m/s?
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Every 18 months, during the Spring tide, the Moon is at its closest distance to the Earth, called its _____. This produces gravitational forces that are very strong and cause extremely high tides.
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Which of these statements is correct for light waves? a.It does not travel through water. b.It does not travel through vacuum. c.It travels fastest through vacuum. d.It travels fastest through water.
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Assume that the energy (electric potential energy) is zero for an electron that is infinitely far from a proton, would the energy be positive or negative for an electron that is bond inside an atom? A
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A big league hitter attacks a fastball the ball has a mass of 0.16 kg it is pitched at 38 m/s after the player hits the ball it is now traveling 44 m/s in the opposite direction the impact lasted 0.00
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An open pipe of 0.76 m long vibrates in the first overtone with a frequency of What is the fundamental frequency of the pipe?
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Why do scientist think Earth's core contains iron? A) The crust does not contain much iron. B) Iron is lighter than oxygen C) Iron does not conduct electricity.
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The use of air bags in cars reduces the force of impact by a factor of 110.(The resulting force is only as great.) What can be said about how the airbag changed the duration of the collision? a.It sta
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You are trying to raise a bicycle wheel of mass m and radius r up over a curb of height h. to do this, you apply a horizontal force f s (fig. p11.72). what is the smallest magnitude of the force f s t
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What is the change in kinetic energy of the crate? 1. 641.269 2. 455.961 3. 322.94 4. 357.105 5. 232.84 6. 655.307 7. 755.704 8. 504.575 9. 364.755 10. 715.41 answer in units of j?
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Two identical traveling waves, moving in the same direction, are out of phase by π/4 rad. what is the amplitude of the resultant wave in terms of the common amplitude ym of the two combining waves?
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The same double-slit experiment is then immersed in water (with an index of refraction of 1.33) and repeated. when in the water, what happens to the interference fringes?
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The acceleration of a rocket launched from ground level during the first 10 seconds is given by the formula a(t)=30t−3t2a(t)=30t−3t2 m/sec22. assume the initial velocity is 120120 m/sec. (a) find
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A sample of an ideal gas at 1.00 atm and a volume of 1.94 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced
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Rock can be weathered and eroded in the rock cycle. What might happen with the resulting rock particles? A. New rock is formed from other rock by great heat and pressure. B. Igneous rock is formed. C.
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A truck, initially traveling at a speed of 22 m/s, increases speed at a constant rate of 2.4 m/s2 for 3.2 seconds. What is the total distance traveled by the truck during this 3.2-second time interval
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Which of the following statements is true about prairie dogs? A. Prairie dogs have a specific call to indicate the intelligence of the predator. B. Prairie dogs vary their call depending on the charac
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If an object is placed at a distance greater than twice the focal length of a convex lens, what type of an image will be produced? real, upright, and enlarged virtual, inverted, and small real, inver
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Which of the following fields includes the study of hurricanes? a.)hydrology b.)geology c.)meteorology d.) astrology
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The field of meteorology is based on studying which of the following? a.)stars and plants b.) weather and climate c.)rocks and minerals d.)earthquakes and volcanoes
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What is true of a molecule? Each molecule of a compound has different properties. All molecules of a compound have the same properties. All molecules of a compound have one type of atom. Each atom of
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Environmental science is the study of a. organismal relationships b. human impact on the Earth c. ecosystems d. all of the above
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A guitar player shortens the length of a guitar's vibrating string by pressing the string straight down onto a fret.
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How can a person maintain a healthy body image? What forces work to make people feel bad about their body images?
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A cylindrical container with a cross-sectional area of 66.2 cm2 holds a fluid of density 796 kg/m3 . At the bottom of the container the pressure is 118 kPa . Assume Pat = 101 kPa
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A student is using an apparatus to perform an investigation. The two calorimeters contain equal amounts of water, and the metal bar is touching the water inside each calorimeter. At the beginning of t
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The graph shows world energy source use - describe the trend in the graph and suggest 2 reasons for changes over time.
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In a 2005 ceremony inducting Dan Marino to the Football Hall of Fame, who was the recipient of Dan's “one last pass” thrown from the podium?
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After learning about CPT code how have you been able to personalize some of the codes to better understand coding
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A baseball is thrown towards a player with intial velocity 20m/s and 45degree with horizontal .At the moment the player is 50m from the thrower.what must be the speed to catch the ball jut before it s
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A firefighter mounts the nozzle of his fire hose a distance 32.1 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. After quenching a
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A cubic box with an edge of exactly 1 cm has a volume of: A. 10−9 m3 B. 10−6 m3 C. 10−3 m3 D. 103 m3 E. 106 m3
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An American Red Cross plane needs to drop emergency supplies to victims of a hurricane in a remote part of the world. The plane is traveling horizontally at 100.0 m/s at a height of 50.0 m above the g
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A sphere mass m1 and a block of mass m2 are connected by a light cord that passes over a pulley. The radius of the pulley is R, and the mass of the thin rim is M.. The block slides on a frictionless,
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Close, emotional bonds of affection that develop between infants and their caregivers defines a. separation anxiety. b. developmental norms. c. bonding. d. attachment.
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What would be the weight of a 59.1-kg astronaut on a planet with the same density as Earth and having twice Earth's radius? A) 580 N B) 290 N C) 1160 N D) 2320 N E) 1200 N
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A suction cup works by creating a vacuum between the rubber cup and surface its stuck to. if the total area of the rubber cups is 0.01 meters, how much weight can the suction cup support when stuck to
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When Esme is catching a softball in outfiled, her constant speed is 12 kilometers/seconds. What is her instantaneous speed when she has run halfway toward the ball?
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a feather has a mass of 0.5 g and the gravitational potential energy when the feather falls through a height og 1.60 m to hit the ground is 0.008 J, calculate the total amount of heat energy transferr
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Newton's second law state that a force on a drag racer is equal to the mass of the car times it's acceleration. one of the most important factors determining the cars acceleration is the tires on the
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A body moving along the x-axis is subject to a force repelling it from the origin, given by F = kx. (a) Find the potential energy function U(x) for the motion and write down the conservation of energ
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You work in a materials testing lab and your boss tells you to increase the temperature of a sample by 42.6 ∘c . the only thermometer you can find at your workbench reads in degrees fahrenheit.
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When the fan is turned on, it takes t = 3.4 s and a total of 13 revolutions to accelerate up to its full speed?
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Two cars collide at an icy intersection and stick together afterward. the first car has a mass of 1200 kg and is approaching at 8.00 m/s due south. the second car has a mass of 850 kg and is approachi
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The velocity in a certain flow field is given by the equation v=x2i^+x2z2j^+y3zk^ determine the expressions for the rectangular (a) x - component, (b) y - component and (c) z - component of accelerati
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The skier starts from rest at a and travels down the ramp. if friction and air resistance can be neglected, determine his speed vb when he reaches b. also, compute the distance s to where he strikes t
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Question part points submissions used hrw6 36-9p two waves of light in air, of wavelength 393. nm, are initially in phase. they then travel through plastic layers as shown in fig. 36-28, with l1 = 4.1
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Problem 5. a barbell consists of two small balls, each with mass m at the ends of a very low mass rod of length d. it is mounted on the end of a low-mass rigid rod of length b. the apparatus is set in
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Onsider an air solar collector that is 1 m wide and 2 m long and has a constant spacing of 3 cm between the glass cover and the collector plate. air flows at an average temperature of 45°c at a rate
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