Physics Properties Of Matter Level: University
Law of FloatationA person sitting in a boat floating in a small pond throws a heavy anchor overboard. Does the level of the pond rise fall or remain the same? Explain what if the anchor rope is too short to allow the anchor to reach the bottom?
Physics Current Electricity Level: University
Power and ResistanceAn electric heater is basically a wire through which the electric current flows. What is the resistance of such a heater if its power is 1000W and it is used in a regular home so that the voltage is 110 V.
Physics Current Electricity Level: University
Electrical EnergySuppose a room has two 100-watt light bulbs. How much is the electricity bill per month ( 30 days) if the light bulbs are all you are paying for and they are used everyday 4 hours per day? The electricity cost is 15 cents per kWh.
Physics Electrostatics Level: University
Coulomb,s LawWhat is the force between two dust paricles each of which collected about 10^8 electrons. This distance between the particles is about 10 microns. The charge of one electron is q=1.6 10^(-19) C, 1 micron = 10^(-6) meters.
Physics Misc Topic Level: University
Projectile MotionIn the egg toss two people toss araw egg back and forth as they move farther apart. If the force required to break the eggs shell is about 5N and the mass of the egg is 50g, estimate the maximum separation distance for the egg throwers. Make whatever reaonable assumptions you need about the launch angle and hand movement.
Physics Force & Laws Of Motion Level: University
Projectile MotionIn the egg toss two people toss araw egg back and forth as they move farther apart. If the force required to break the eggs shell is about 5N and the mass of the egg is 50g, estimate the maximum separation distance for the egg throwers. Make whatever reaonable assumptions you need about the launch angle and hand movement.
Physics Ray Optics Level: University
LightAssume a parallel beam of white light strikes a 60 degree equilateral triangular glass prism ( surrounded by air) with n = 1.520 for red light and n = 1.538 for violet. The incident beam strikes one side of the prism at its midpoint with and angle of 60 degrees to the normal surface. The refracted beam then exits some other surface and an arry of color is seen projected on a nearby wall.
a. Draw a ray diagram for both read and violet light that enters the glass and then exits at its first opportunity. Angles should be drawn to scale.
b. What angle are the colors spread out by after they leave the prism?
c. Will total internal reflection prevent the refracted rays from exiting the prism with the above condition? Why or why not?
Physics Ray Optics Level: University
LightA beam of light enters the gap between two flat vertical and parallel mirrors that are 10 meters tall and are separated by 1 meter. The angle the beam makes to horizontal is 30 degrees. The beam reflects between the two mirrors a number of times before exiting the gap at the top of the mirrors.
a. How many reflections occur before the light beam exits the top?
b. if at every reflections only 95 percent of the light is reflected ( 5 percent is absorbed) what percent of the original beam makes it out the top?
Physics Ray Optics Level: University
LightA beam of light enters the gap between two flat vertical and parallel mirrors that that are 10 meters tall and separated by 1 meter. The angle the beam makes to horizontal is 30 degrees. The beam reflects between the two mirrors a number of times before exiting the gap at the top of the mirrors.
Physics Heat & Thermodynamics Level: University
Units conversion of energyA soft drink manufacturer claims that a new drink is low joule. The label indicates the available energy is6300 J. What is the equivalent of this energy in calories ( 1 Calorie = 1000 cal)?
Physics Heat & Thermodynamics Level: University
VolumetricZirconium tungstate is an unsual material because its volume shrinks with an increase in temperature for the temperature range 0.3 K to 1050 K(where it decomposes). In fact the volumetric coefficient of thermal expansion is - 26.4 x 10 ~6/k. Determine the ratio ( delta V/final V) for the above mentioned temperature range. Express your answer in percent.
Physics Heat & Thermodynamics Level: University
ExpansionA metal rod 40.0000-cm long at 40oC is heated to 60oC. The length of the rod is then measured to be 40.0105-cm. What is the coefficient of linear expansion of the metal in units of /oC?
Physics Properties Of Matter Level: University
A curtain hangs straight down in front of an open window. A sudden gust of wind blows past the window and the curtain is pulled out of the window. Which law principle or equation can be used to explain this movement of the curtain?a. Poiseuilles law
b. Bernoulls equation
c. The equation of continuity.
d. Archimedes principle
e. Pascals principle.
Physics Properties Of Matter Level: University
Bernoullis theoremWhich one of the following statements is false concerning the derivation or usage of Bernoullis equation?
a. The fluid be non-viscous
b.Streamline flow is assumed.
c. The fluid must be incompressible.
d.The work- energy theorem is used to derive Bernoullis equation.
e. Vertical distances are always measured relative to the lowest point within the fluid.
Physics Properties Of Matter Level: University
Bernoullis theoremWhich one of the following statements is false concerning the dervation or usage of Bernoullis equation?
a. The fluid be non- viscous
b. Streamline flow is assumed
c. The fluid must be incompressible.
d.The work-energy theorem is used to derive Bernoulli's equation.
e. Vertical distances are always measured relative to the lowest point within the fluid.
