Physics Waves And Oscillations Level: Misc Level
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 HZ that can travel up to 10km. The intensity level of these sounds can reach 103 dB. measured a distance of 5. 0 0m from the source. Determince the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions.
Physics Kinematics Level: Misc Level
A box is sliding down a plank inclined at an angle of 20% from the horizontal. Find the acceleration of the box, neglecting friction and air resistance.
Physics Vectors Level: Misc Level
If the magnitude of the product A x B is equal to the AB, then
A. vectors A and B cannot be in the same plane.
b.vectors A and B must be parallel and point in the same direction.
C.vectors A and B must be parallel but point in opposite directions.
D. vectors A and B must be at right angles.
Physics Kinematics Level: Misc Level
A football player kicks a ball at an angle of 37% from the horizontal with an initial speed of 50 ft /sec, and the ball moves in a vertical plane. Find the elapsed time from kickoff until the ball reaches its highest point. Neglect air friction.
what the highest point reached by the ball in the above question?
Physics Electromagnetic Induction Level: Misc Level
Suppose you take a coil of wire and you could measure any current passing through it You now wave the coil around in the air and even though there are no magnets nearby you detect a current in the wire. what causes this current
Physics Electromagnetic Waves Level: Misc Level
What makes some radiation harmful and some not harmful, for instance the visible light given off by a light bulb is an electromagnetic wave but will not harm your body , but an xray is also an electromagnetic wave but can be harmful to your body.
Physics Alternating Current Level: Misc Level
A powerplant produces a certain amount of power at a certain voltage, the power is stepped up to a much higher voltage for transmission over long distances using a transformer then stepped down to a lower voltage before it enters your home. what is the purpose of this procedure?
Physics Misc Topic Level: Misc Level
How do I evaluate this limit?
e = lim [ x->00] (1 +1 /x)^x
I Want to know how to algebraically arrive at the value of e. Do I used factoring?
Physics Electromagnetic Waves Level: Misc Level
The amplitude of the B field of an EM wave is 2.3 E- 7 T.
What is the amplitude of the E field?
what is the average power per unit area of the EM wave?
Physics Electromagnetic Waves Level: Misc Level
How much energy is transported across a 1.00 - cm 2 area per hour by an EM wave whose E field has an ms strength of 58.6 mV/m?
Physics Electromagnetic Waves Level: Misc Level
Pulsed lasers used for scince and medicine produce very short bursts of electromagnetic energy. The laser light wavelength is 1095 nm and the pulse lasts for 20 picoseconds.
How many wavelengths are found within the laser pulse?
How short would the pulse need to be to fit only one wavelength?
Physics Waves And Oscillations Level: Misc Level
What is the wavelength of a 2.757 E 10 Hz radar signal?
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
If the magnetic field in a traveling EM wave has a peak value of 12. 5 nT, what is the peak value of the electric field strength?
Physics Properties Of Matter Level: Misc Level
A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1. 33 x 10 ^3 Pa, what must the minimum height of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1. 02.
Physics Properties Of Matter Level: Misc Level
If the elastic limit of steel is 5.0 x 10 ^ 8 Pa, determine the minimum diameter a steel wire can have if it is to support a 70 - kg circus performer without its elastic limit being exceeded.
