04/15/17

Physics Help. A string is wrapped around a disk of mass m = 2.3 kg and radius R = 0.08 m.
Starting from rest, you pull the string with a constant force F = 6 N along a nearly frictionless surface. At the instant when the center of the disk has moved a distance x = 0.12 m, your hand has... more
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04/15/17

physics help
A certain lightbulb has a tungsten filament with a resistance of 21.0 when cold and 142 when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large temperature... more
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04/15/17

The length of nylon rope from which a mountain climber is suspended has an effective force constant of 1.40 × 104 N/m.
THIS IS THE FULL QUESTION. The length of nylon rope from which a mountain climber is suspended has an effective force constant of 1.40 × 104 N/m. (a)What is the frequency at which he bounces,... more
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04/14/17

What Is Singularity ?
How did it come to mind that, it is in blackhole ?  What about its properties?  
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04/11/17

A pellet carrying charge +q is centered inside a spherical cavity that has been cut off-center in a solid metal sphere that carries charge −2q.
How much charge resides on the outer surface of the metal sphere? Express answer in terms of q.
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04/10/17

Eikonal equation (method of characteristics)
Ux2+Uy2=[n(y)]2  , where n(y)=n0(1+ky). How do I proceed use method of characteristics to solve Eikonal equation when                                                                 it is not = to... more
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04/06/17

Multi-loop circuits with resistors
Find the current I1 in the 0.7 Ω resistor at the bottom of the circuit between the two power supplies. Answer in units of A.    Picture of diagram... more
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04/06/17

What is the smallest number of balls that must be dropped until the cart is moving at less than one-ninth its initial speed?
A small cart rolls freely along the floor. As it rolls, balls of clay, each having one-seventh the mass of the cart, are dropped straight down onto the cart and stick to it. What is the smallest... more
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04/06/17

Which bulb will glow brighter in the combination of series and parallel?
There are two circuits one is in the series and second is in the parallel, In series combinatin two bulbs ,one battery and one resistance is connected with some  voltage and In parallel combination... more
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04/03/17

Physics question about snell's law and angle of deviation
The diagram shows a triangular prism with a ray of light entering side AB and incident on side AC as shown. The refractive index of the material making up the prism is 1.64. Identify quantitatively... more
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04/02/17

ANOther physics question i need help with!
An ordinary light bulb will hum at 13 decibels one meter away in a spherical shaped wave. Explain how many decibels you would hear if you were 2 meters away from 2 light bulbs.
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04/02/17

I need help with this physics questions!
The battleship New Jersey has nine 16-inch guns on its deck. If a person was on deck when all nine were fired, they would be subjected to a 215 decibel level of sound. At 202 decibels, a human... more
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03/31/17

How fast is this star moving
A line in a star's spectrum lies at 400.0 nm. In the laboratory, that same line lies at 400.2 nm. How fast is this star moving? Is it moving towards or away from us?   Answer and explanation for... more
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03/31/17

An aluminum wire with a diameter of 0.1 mm has a uniform electric field with a magnitude of 0.2 V/m imposed along its entire length.
The temperature of the wire is 50 degrees (Celsius). Given that at 20 degrees, ρo = 2.82x10-8 Ωm and α = 3.9x10-3 /C. Determine: a) the resistivity of the wire b) the current density in the... more
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03/25/17

Find the magnification factor for the given spectrograph?
For a spectrograph fed with an f/3.32 beam, and with an f/1.33 camera, what is the magnification factor of the entrance slit at the detector focal plane (larger or smaller)?   The question is... more
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03/18/17

if i have 0.271m^3 water at 25 and add 0.107m^3 water at 95. what is the final temperature of the mixture? density=1000
 he just gave that information. the density is at any temperature.
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03/18/17

The energy difference between the two laser levels is 0.275 eV. What is the frequency of the radiation emitted by this laser?
No other details, this is all that is provided in the question.
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03/18/17

what is elastic collision
what is elastic collision in one dimensional !  Send me a lecture plzz
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03/17/17

Capacitors in Combination-Find Each Charge
C1 and C2 are capacitors in parallel. C3 is in series with C12. C1=16.6 microF, C2=8.2 microF, C3=0.3 microF. A 1.52 V battery is connected in this combination. Find the charge stored on each... more
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03/16/17

Impulse and force
I've been stuck on this question forever and I keep getting it wrong :( Please help!   A truck of mass 3 tonnes is travelling at 105km/h when it hits a car of mass 1.5 tonne travelling in the... more
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03/14/17

The 440Hz tuning fork is used with a resonating column to determine the velocity of sound in helium gas.
If the spacing between resonance are 110 cm, what is the velocity of sound in He?   ans. 970m/s   ps. How can I get the answer? Thx! 
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03/14/17

thermodynamics
An insulated beaker with negligible mass contains 0.310 kg of water at a temperature of 70.5°C. How many kilograms of ice at a temperature of −20.0°C must be dropped into the water to make the... more
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03/13/17

Physics Question
Two horns emit frequencies of 110 hz. and 140 hz. (a.) What is the difference in their wavelengths if the air temp. is 10.0 C.? (b.) what beat freq. will be heard?
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03/13/17

Physics Question
Find the fundamental frequency and two other frequencies that will be naturally produced, by a string of mass 5.00g that is 0.750 m long and put under a tension of 360.0 N.
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03/05/17

A stationary boat accelerates to 90 km/hr over 1 km. What is the time it takes to do this?
A stationary boat accelerates to 90 km/hr over 1 km. What is the time it takes to do this? Ans: 80s
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