Master Physics with Fun Quizzes & Brain Teasers!

What are the effects of elastic limit on a structure built on a fault line?
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A plane monochromatic electromagnetic wave with wavelength =2. 0cm, propagates through a vacuum. Its magnetic field is described by >B =(Bxi^+Byj^)cos(kz+t), where Bx=1. 9106T,By=4. 7106T, and i^ and j^ are the unit vectors in the +x and +y directions, respectively. What is Sz, the z-component of the Poynting vector at (x=0,y=0,z=0) at t=0?
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Big fish swim substantially faster than small fish, while big birds fly faster than small ones. However, the speeds of runners vary a lot less with body size, although big ones do go somewhat faster, never mind a lot of highly unreliable top speed data. Some general scaling rules might help. Assume that the cost of transport (cost per distance) varies with body mass^0. 68, that the maximum metabolic rate varies with body mass^0. 81, and that efficiencies and so forth don't vary with body size. How many times faster should a 450 kilogram bear be able to run than the top speed of a 45gram rodent
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To work a ball of dough with the fingertips or heels of the hands by repeating press, fold, and turn motions is to
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Kindly explain newton's formula for the speed of sound
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Because the human body is a holistic organism, this means that A. Each person reacts to stress the same wayB. Physical injuries do not affect mental processes C. Religion plays a key role in how people react to stress D. A negative effect in one area can affect others areas
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Two uniform solid spheres have the same mass, 1.75 kg, but one has a radius of 0.206 m while the other has a radius of 0.834 m. for each of the spheres, find the torque required to bring the sphere from rest to an angular velocity of 327 rad/s in 15.5 s. each sphere rotates about an axis through its center. torque on sphere with the smaller radius.
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Boyles law describes the relationship between pressure and volume . more specifically, it states that the relationship between these two quantities is [ select ] proportional. it is important to remember that boyles law only applies to [ select ] and situations when the [ select ] is constant.
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A roller coaster passes over the top of the hill going 2. 7 m/s and reacts the bottom going 14m/sA)How high is the hill?B)What is spread half way down?(Energy problem)
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A 2000-kg ferris wheel accelerates from rest to an angular speed of 20 rad/s in 12 s. approximate the ferris wheel as a circular disk with a radius of 30 m. what is the net torque on the wheel
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Angle axc is 180. if angle axb is 132, what is the measure of angle bxc?
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What would the RPM be if we were turning a 1. 00" diameter work piece made out of mildsteel, using HSS cutting tool?
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Recently scientist have managed to indirectly observe a super massive black hole in the center of our galaxy. using your imagination and what we have discussed in class, what do you imagine itll be like on the other side of the event horizon?
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For problems 3,4, and 5, Consider an egg that has a mass of 0. 15 kg being held at the top of a flight of stairs. 3. If an egg has 11 J at the top of the stairs, what is the height of the stairs? 4. If the egg is dropped from that height, what is the Kinetic energy right before the egg hits the ground?5. If the egg is dropped down to the ground from that height, what is the velocity of the egg right before the egg hits the ground?
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A 615 watt refrigerator runs 24 hours/day. how much energy is used per month (30 days)? express your answer in kwhr.o a 28.45 kwhrob. 442,800 kwhroc. 442.8 kwhrd. 14.76 kwh
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The speed of a light ray (f=5.09*10^14Hz) in corn oil is
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Base your answer to the following question on theinformation below.A 2.00 106-hertz radio signal is sent a distance of7.30 1010meters from Earth to a spaceshiporbiting Mars.Approximately how much time does it take the radiosignal to travel from Earth to the spaceship?
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A soda bottle (m=0. 1 kg) filled with a flammable vapor is ignited and a rubber stopper (m=0. 01kg) is fired across the room at 100m/s. Find the recoil velocity of the soda bottle
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How many grams are in 0. 02mol of Mg (25. 3g/mol)
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Pls help 20 pointsIf you push the head of a nail against your skin and then push the point of the same nail against your skin with the same force, the point of the nail may pierce your skin while the head of the nail will not. Considering that the forces are the same, what causes the difference?
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The maximum allowable resistance for an underwater cable is one hundredth of an ohm permeter and the resistivity of copper is 1. 54 x 10-80m. a) Calculate the smallest cross sectional area of copper cable that could be used.
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Suppose that water waves coming into a dock have a velocity of 1.2 m/s and a wavelength of 2.4 m. with what frequency do these waves meet the dock
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6) In a purely electric vehicle, energy usually is stored in batteries. The stored energy is used topower the vehicle until the energy is depleted, and then energy has to be stored once more byrecharging the batteries. An electric wheelchair has a mass of 26 kg and is customdesigned for aperson with a mass of 80. 0 kg. The stored energy available in its batteries is 2. 4106J. Thewheelchair motor requires a power of 340. 0 W for driving under typical conditions. This issufficient to propel the person in the wheelchair along at a speed of 24 km/h. a. Determine the work done by the motor when the wheelchair starts at rest and speeds up toits normal speed. b. Determine the maximum distance that the wheelchair can travel on a horizontal surface at itsnormal speed, using its stored energy. (Ignore the energy needed for it to speed up when itstarts. )c. Suppose that 0. 023 percent of the power required for driving is expended against drag dueto the flexing of the wheelchairs soft rubber tires. Calculate the magnitude of the drag force
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2. A woman lifts up a laundry basket 1. 5m and carries it 20m across the room. This takes 15s. Work is done on the laundry basket_*(20 Points)in walking across the roomduring the entire 15swork is not donein lifting the basket
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