Physics

a point charge q is far from all other charges. at a distance of 2 m from q the electric field is 20n/c. what is the force a charge of 5 coulombs feels
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A metal cup containing water at 100c is placed in a tank of water at 80c when will the flow of heat stop
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if an object is raised twice as high, its potential energy will be four times as much. half as much twice as much. impossible to determine unless the time is given.
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during angular motion, what is the relationship between the length of the moment arm and the torque created (when the force used is constant)?
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when rotating the platform, the hanging mass should be removed from the platform. question 2 options: true false
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which of the following relationships about a coil are true? check all that apply. which of the following relationships about a coil are true?check all that apply. the induced emf is proportional to the resistance of the coil. the induced emf is proportional to the time derivative of the current in the coil. the induced emf is proportional to the self-inductance of the coil. the induced emf is proportional to the current in the coil.
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what is the capacitance per unit length ( f/m ) of a coaxial cable whose inner conductor has a 1.2 mm diameter and the outer cylindrical sheath has a 5.5 mm diameter? assume the space between is filled with air.
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how does matter affect your daily lives?
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an object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2. after 5 seconds, the object will have a speed of
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the maximum horizontal distance from the center of the robot base to the end of its end effector is known as .
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a rocket releases a satellite into a circular orbit 785 km above earth's surface. how fast must the satellite be going to stay in this orbit? give your answer in km/s.
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the dimension of time is t. and the dimension of length is l. in dimensional analysis, what is the dimension of an acceleration?
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What is the mass of an object if a force of 30 N causes it to accelerate at 1. 5 m/s/s?
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explain the use of air bags and seat belts in terms of momentum and impulse. please provide examples (and calculations) to elaborate your concepts.
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from the results, was there a good agreement between the experimental acceleration and the theoretical (expected) acceleration? what causes the difference? discuss sources of experimental uncertainty for this experiment
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a velocity vector has a magnitude of 22.0 m/s . if its y component is -12.0 m/s , what are the possible values of its x component?
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the photo at right was taken through a spectroscope. what color was the pigment extract used to produce this spectrum?
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cellular phones use radio waves to transmit information. if your cell phone uses a frequency of 1800 mhz , what is the wavelength of the electromagnetic radiation emitted by your phone?
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if we monitor a point on a wire where there is a current for a certain time interval, which gives the chargef that moves through the point in that interval?
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what is unusual about the position of uranus and neptune in the nice model of solar system formation?
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an antenna will propagate rf energy in specific radiation patterns, both horizontally and vertically. how do antenna manufacturers identify the horizontal radiation patterns?
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how much electric power (in kw ) does the heat pump use to deliver 19.0 kj/s of heat energy to the house?
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describe the relative intensity of sound produced by the tuning fork as detected by the plugged and unplugged ears
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a bicycle wheel has a radius of 0.304 m and a rim whose mass is 2.50 kg. the wheel has 50 spokes, each with a mass of 0.0100 kg. (a) calculate the moment of inertia of the rim about the axle. (b) determine the moment of inertia of any one spoke, assuming it to be a long, thin rod that can rotate about one end. (c) find the total moment of inertia of wheel, including the rim and all 50 spokes.
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