Physics Questions
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The sum of electrostatic and magnetic forces acting on an object is called:
If charge is moving parallel or antiparallel to magnetic field vector, it will experience...
When a source is moving at or above the speed of sound, what can form?
For points in space relatively distance from the dipole, what does the product of r1 and r2 approximate? What about r1-r2?(need clarification?)
Not only are moving charges affected by magnetic fields, they can also create them. Magnetic fields only exert force on other moving charges. Explain what this exactly means.
If source and detector are moving toward each other, what are the consequences? Hint: Doppler effect
A datum is a "ground" or zero gravitational potential energy (U) position. Assuming surface of water is datum, what is U when diver of 80kg is 2m below the water.
Give the formulas for kinetic, gravitational potential, and elastic potential energy.
Suppose we have a two-pulley system in translational equilibrium, such that the weight of object is equal to twice the tension of rope. Hence, each rope supports half of the object's total weight. If I want to lift the object 3m above the ground (load distance), I must pull length of rope 6m (effort distance). Why is length of rope twice the displacement?
If I triple the mass of an object, what happens to gravitational potential energy?
Efficiency in conserving energy output to input gives a measure of amount of useful work generated by machine given amount of work put into system. How do you calculate efficiency?
Are the magnetic field configurations for long, straight wire and a circular loop of wire the same?
a measure of the average kinetic energy of the particles in an object
What two types of energy transfer happens when you heat water on a stove?
Temperature is directly proportional to the...
At 20 degrees C, sound travels at velocity...
Water is most dense as a liquid at...
A spaceship traveling very fast relative to you fires a stream of photons at speed c away from you. You measure the photons' speed to bea) less than cb) more than cc) equal to c
As a spaceship moving toward you at 0.6 the speed of light fires a probe toward you, relative to itself at 0.8 the speed of light, you see the probe approaching at about …a) 0.89cb) 0.94cc) 0.91cd) 0.87ce) 0.70c
The length of a 100-meter long spaceship passing by you at 0.87c is seen to be …a) 50 mb) 87 mc) 100 m d) 125 me) 150 m