Physics

You are in a car traveling at 20 m/s. An ambulance is behind you traveling 35 m/s in the same direction. What frequency do you hear if the siren has a frequency of 550 Hz?
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To determine the coefficient of static friction between two materials, an engineer places a small sample of one material on a horizontal disk whose surface is made of the other material and then rotates the disk from rest with a constant angular acceleration of 0.4 rad/s2. If she determines that the small sample slips on the disk after 9.903 s, what is the coefficient of friction
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Provide two examples of how health care workers can demonstrate their commitment to quality control through their personal appearance.
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6. What is the resultant force on each car below? Remember TWO pieces ofinformation are needed.7. What additional statement could we make about each car? Think about what keywords we could use
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Question 1 of 10Which object has the most gravitational potential energy?A. A 8 kg book at a height of 2 mB. An 8 kg book at a height of 3 mC. An 5 kg book at a height of 3 mD. A5 kg book at a height of 2 mSUBMIT
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Solids, liquids, and gases are very often depicted as groups of particles inside containers of fixed shape and dimension.Using the simple model of solid, liquid, and gas, which of the following descriptions of physical properties is CORRECT? A The physical properties of this phase of matter are that the particles take the shape of the container, do not fill the entire volume, and are very strongly attracted to each other. B The physical properties of this phase of matter are that the particles take the shape of the container, do not fill the entire volume, and are strongly attracted to each other. C The physical properties of this phase of matter are that the particles take the shape of the container, they fill the entire volume of the container, and are strongly attracted to each other. D The physical properties of this phase of matter are that the particles do not take the shape of the container, they fill the entire volume, and are weakly attracted to each other.
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Carbon (C) is an element found in living organisms. How would carbon be classified in the hierarchy of organisms?
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The half-life of radium-226 is 1590 years. (a) A sample of radium-226 has a mass of 100 mg. Find a formula for the mass of the sample that remains after t years. (b) Find the mass after 1000 years correct to the nearest milligram. (c) When will the mass be reduced to 40 mg? SOLUTION (a) Let m(t) be the mass of radium-226 (in milligrams) that remains after t years. Then dm/dt = km and m(0) = 100, so this theorem gives m(t) = m(0)ekt = ekt. In order to determine the value of k, we use the fact that m(1590) = 1 2 . Thus e1590k = so e1590k = and 1590k = ln 1 2 = ln(2) k = . Therefore m(t) = . We could use the fact that eln(2) = 2 to write the expression for m(t) in the alternative form m(t) = . (b) The mass after 1000 years is as follows. (Round your final answer to the nearest milligram.) m(1000) = mg
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What types of crust are colliding between the South American Plate and the Nazca Plate?Answer Choices:Continental Crust/Continental CrustOceanic Crust/Oceanic CrustOceanic Crust/Continental Crust
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As a sports car travels along a level stretch of road with constant speed, most of the power developed by the engine is used to compensate for the energy transformations due to friction forces exerted on the sports car by the air and the road. If the power developed by the engine is 0.824 hp, calculate the total friction force acting on the sports car (in N) when it is moving at a speed of 30 m/s. One horsepower equals 746 W.
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I NEED THIS ANSWERED ASAP WITH THE RIGHT ANSWER A bicycle with a 15 kg mass is easily stopped when a force of 60 N is applied. How much force would be needed to stop the bicycle if the time allowed to stop the bike was doubled?
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In a penalty kick, a soccer player kicks the ball from ground level with an initial velocity of .5.0 m/s,20.0^ above the horizontal . Assume that air resistance is negligible . What is the maximum height , y max of the soccer ball ?A)0.51 B)3.2C)3.7D)8.6What is the flight time of the soccer ball in the previous problem? A)0.76 sB)0.87 sC) 1.3 sD) 1.7 s
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Why might video games increase creativity while the use of cell phones, the internet, or computers do not?
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Which experiment proved light was a wave?A) Photoelectric effectB) Double SlitC) Compton ScatteringD Light was never proved to be a wave
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An enormous thunderstorm covers Dallas-Ft. Worth. Your best friend Clark is a storm chaser and heads to the center of the storm to take some readings while you stay dry at home. While Clark is at the center of the storm, he sees and hears lightning strike a tree that is 190 m from where he is standing. You are 140 km from the tree. How long does it take for the sound to reach Clark
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Which pair of moving pulses in a rope will producedestructive interference?
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Which one of the following statements concerning the buoyant force on an object submerged in a liquid is true?A) The buoyant force depends on the mass of the object. B) The buoyant force depends on the weight of the objeet. C) The buoyant force is independent of the density of the liquid. D) The buoyant force depends on the volume of the liquid displaced. E) The buoyant force will increase with depth if the liquid is incompressible.
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testing related to criteria
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What is the cheetahs momentum?
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what is the mass of a ball rolling at 4.5m/s if it's momentum is 3.5 kgm/s?
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[O.05]Which of these Earth spheres interact with oceans during beach erosion? geosphere hydrosphere cryosphere atmosphere
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A ray of light strikes a flat mirror at an angle of 40 from the perpendicular. The light is reflected atwhat opposite angle to the same perpendicular line?a) 40b) 50c) 30d) 60
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Can someone plz explain :Two cars have the same mass, the first car is moving towards the east and the second isstationary. If the two cars merge together after a collision and head towards the east their speedafter the collision is equal to.......A)1/4vi b)1/2vi c)vi d) 2vi
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What happens when a moving object is moving a particular direction experiences a net force opposite the direction?
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