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Object 1 has a temperature of 95° C and object 2 has a temperature of 35° C. What is the ratio of the net power emitted by object 1 to that radiated by object 2?
Work of 1500 J is done on an ideal gas, but the internal energy increases by only 800 J. What is the amount and direction of heat flow into or out of the system?
Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna, taking 98 MHz as a typical FM frequ
An observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. How much further away from the speaker must the observer walk to hear a s
The armature of a simple ac generator has 30 circular loops of wire, each with a radius of 10 cm. It is rotated with a frequency of 60Hz in a uniform magnetic field of 700 mT. What is the maximum em
A student exchanges the stock headphones (B1 = 89 dB) for her mp3 player for a new set that is louder (B2 = 94.5dB). If the first set produced a power of P = 0.5 W, how much power does the new s
A point on the rim of a 0.71-m-diameter grinding wheel changes speed at a constant rate from 11 m/s to 25 m/s in 7.3 s. What is the average angular acceleration of the wheel?
A student hears a sound with an intensity of l = 16*10^-6 W/m^2. If the student hears a sound a 10 dB, what is the intensity of the sound?
If 600 j of heat are added to 50 g of water initially at 20 degrees C. How much energy is this in calories? What is the final temperature of the water?
A piano string is under a tension of T = 778N. When struck the wave has a period of t = 0.6ms and a wavelength of 0.77m. What is the linear density of the string?
The string has a mass of m = 99g and length L. When the string is plucked the sound travels at V = 498 m/s. What is the length of the string in m?
Unpolarized light goes through six Polaroid sheets. Each Polaroid sheet is at an angle of 30° from the one before it. What is the intensity of the light after it passes through all the sheets?
A student calculates the frequency of a waveform produced by a tuning fork to be 303 Hz. If the tuning fork is stamped with a frequency of 279 Hz, what is the percent error for the experiment?
A student measures the time of one wavepeak to be 0.00450 seconds and the time of the next peak to be 0.00900 seconds. What is the frequecy of the wave?
The fundamental when a tuning fork of unknown frequency vibrates near one end of the pipe. Find the frequency of the tuning fork and the frequencies of the first three overtones that resonate in
An AM station is broadcasting a radio wave whose frequency is 1340 kHz. The value of the capacitance in the circuit of an antenna is 7.20 10-11 F. What must be the value of the inductance in order th
In an echolocation lab, a student measures the time from the first click of the fingers to the first echo to be 0.0062. If the speed of sound in the room is 345 m/s, what should the student calculat
Water flows from this hose with a speed of 1.3 m/s. How long will it take to fill the pool to a depth of 19 cm if it is circular and has a diameter of 2.4 m?
What is the average angular velocity of one of the mandibles of the trap-jaw ant when the mandibles snap shut?
A 2.30-g bullet embeds itself in a 1.30-kg block, which is attached to a spring of force constant 780 N/m . If the maximum compression of the spring is 5.80 cm, find the initial speed of the bullet.
A meterstick is moving by an observer in a direction parallel to its length. The speed of the meterstick is .49c. What is its length in the reference frame of the observer?
What is the magnitude of the net torque T on the loop?
What will be the speed of each of the latter? The mass of the K0 is 8.87 x 10-28 kg and the masses of the p+ and p- particles are 2.49 x 10-28 kg each.
The amount of charge that passes through the filament of a certain lightbulb in 2.00 s is 1.67C.
A patient is undergoing open-heart surgery. A sustained current as small as 25μA can be fatal. Assume that the heart has a constant resistance of 250Ω. Determine the minimum voltage that po