Physics

A net force of 40 N south acts as an object with a mass of 20kg. What is the object's acceleration
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What is the power of a circuit with voltage 12 V and current 8.0A?
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when do i know if the acceleration (a) in newtons second law is 0?
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What is the angle of refraction for a beam of light moving from a prism to air if the angle of incidence is 30 and the prisms index of refraction is 1.6?
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What will be the final velocity of a rock if we drop it off of a bridge and it strikes the ground 2.8s later (ignoring air resistance)?
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HELP ME ASAP PLZ! What is the relationship between an electromagnetic wave and the vibrations of the electric and magnetic fields it moves through.
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plzz help mee What do you notice about how we write out the symbols for the different elements?
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The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which the astronaut sits. The other end of the arm is connected to an axis about which the arm and chamber can be rotated. The astronaut moves on a circular path, much like a model airplane flying in a circle on a guideline. The chamber is located 20.0 m from the center of the circle. At what speed must the chamber move so that an astronaut is subjected to 5.64 times the acceleration due to gravity
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Electrons and protons travel from the Sun to the Earth at a typical velocity of 3.83 105 m/s in the positive x-direction. Thousands of miles from Earth, they interact with Earth's magnetic field of magnitude 3.04 108 T in the positive z-direction. Find the magnitude and direction of the magnetic force on a proton. Find the magnitude and direction of the magnetic force on an electron.
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The three basic economic questions societies face are (1) what goods and services to produce, (2) how to produce those goods and services, and (3) who will get them.In one or two paragraphs, explain how supply and demand help societies determine their answers to these three questions. Be sure to provide an example of the effect of supply and demand on a society's answers.please help
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Earthquakes produce two kinds of seismicwaves: he longitudinal primary waves (calledP waves) and the transverse secondary waves(called S waves). Both S waves and P wavestravel through Earth's crust and mantle, butat different speeds; the P waves are alwaysfaster than the S waves, but their exact speedsdepend on depth and location. For the pur-pose of this exercise, we assume the P wave'sspeed to be 8560 m/s while the S waves travelat a slower speed of 5760 m/s.If a seismic station detects a Pwave andthen 30.5 s later detects an S wave, how faraway is the earthquake center?Answer in units of km.Mi
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What happens to energy when it is consumed?
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You serve a basketball with a mass of 5 kg. If the ball leaves your hand at 30 m/s what isthe kinetic energy?A) 150 joulesB) 2,250 joulesC) 75 joules
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Kinetic energy is the energy of motion and increases with the speed of the wave. a. Trueb. FalsePotential energy is the energy of gravitational pull on the wave.a. Trueb. False
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Which one of the statements below is true about mechanical waves?They must travel in empty space.They can travel in a vacuum.Both sound and light are examples of mechanical waves.They require a medium to travel through.
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Which of the following best describespollutants?A. harmful substances in the air, water, or soilB. radioactive particles that pass through the atmosphereC. oxygen molecules that are released by plantsD. beneficial substances that increase overall health
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Two identical speakers are set some distance apart in a large open field. Both are producing sound, in unison, with a wavelength of 4 m. An observer wandering around the field notices that the sound is surprisingly loud at certain locations and unusually quiet at others. The observer concludes that this is the effect of interference between the two sources of sound waves. For each location, indicate which sort of interference would occur at that point.
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HELPPPA 1.50-kg cart rolls along a horizontal table at a constant speed of 1.70 m/s. A ball of soft putty is dropped from a stationary hand onto the cart as it passes underneath. If the speed of the cart is reduced to 1.53 m/s, calculate the mass of the ball of putty. This collision is completely inelastic
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As air pressure decreases, what happensto the density of the atmosphere?A. increasesB. decreasesC. stays the sameD. not enough information to tell
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A Navy vessel is traveling due north during wartime. A torpedo has been launched by an enemy directly toward the stern (rear) of the vessel. Can the vessel outrun the torpedo if both continue in a straight line due north? A) Yes, the Navy vessel is faster B) No, the Navy vessel is slower C) Maybe, since both travel at the same speed D) Maybe, based on the temperature of the water
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What is the origin behind the term " cell phone "
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PLSS HELPP Are humans evolving? What will humans look like in 100,000 years in the future or longer?
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______ charges repel each other.
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What are the 3 least important cell parts and why
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