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The range of wavelengths allotted to the radio broadcast band is from about 150 m to 630 m. If each station needs exclusive utilize of a frequency band 10 kHz wide, how many stations can operate in the broadcast band?
In a physics lab, a student accidentally drops a 21.0-g brass washer into an open Dewar of liquid nitrogen at 77.2 K. How much liquid nitrogen boils away as the washer cools from 291 K to 77.2 K? The latent heat of vaporization for nitrogen is 199.1 ..
A tennis ball of mass m = 0.060 kg and speed v = 25 m/s strikes a wall at a 45-degree angle. It rebounds with the similar speed, once again at a 45-degree angle. What is the magnitude of the momentum impulse (in Ns) that the ball gave the wall?
A pitcher throws a 0.145-kg baseball to a batter at 36 m/s. The batter hits the ball straight back at the pitcher at 49 m/s. The amount of time that the bat and ball are in contact is 9.0E-3s. What is the force (in N, assumed to be constant) among th..
At low speed, air resistance is a force proportional to the velocity v of an object: F = -kv. Is this force conservative? What is the escape velocity (in m/s) from the Sun (M =2.0E30 kg) of an object that is a distance 9.1E7 km from the center of the..
A public school law requires a minimum illumination of 160 lx on the surface of all students’ desk. If the lights are 2.0 m above the desks, what is the minimum luminous flux the lights should deliver?
What is the pressure change in water going from a 3.0- cm-diameter pipe to a 2.1- cm-diameter pipe if the velocity in the smaller pipe is 6.5 m/s?
A particular organ pipe can resonate at 264 Hz, 440 Hz, and 616 Hz, however not at any other frequencies between 264 and 616 Hz. (a) Is this an open or closed pipe? (b) What is the fundamental frequency of this pipe?
Compute the buoyant force experienced by a steel shell totally submerged in fresh water.(The radius of the shell is70.0 cm and its mass is 1990kg.) What will occur if the shell is released (while experiencing this buoyant force)?
If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? Burn a 60 W light bulb for 24 h straight. Operate an electric oven for 6.0 h if it carries a current of 20.0 A at 220 V.
A submarine submerges to a depth of 144 meters. Compute the pressure on the submarine. State your answer in both Pascal and atmospheres.
Initially 1.300 mol of an ideal gas in a container occupies a volume of 2.50 l at a pressure of 3.30 atm with an internal energy U1 = 592.8 J. Find the heat added during this process
a conducting sphere of radius 20.0 cm carries an excess charge of 15.0 oc and no other charges are present. k 14??0
An object weighing 307 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 270 N. Immersed in oil, the object weighs 282 N. compute the density of the object.
An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container
Interstellar space has a magnetic field on the order of 0.1 nT. Matter in this space is mainly Hydrogen atoms (about 1 per cubic centimeter) moving with speeds of about 1 km/s. Compare the energy in the magnetic field to the Kinetic Energy of the ato..
Find the acceleration of the aircraft and express it in multiples of g, free fall acceleration.
A generator with an rms voltage of 130V is connected in series to a resistor 3.25 kilo-ohm, At what frequency must this circuit be operated for the current to lead the voltage by 24.0 degrees
Three, and only three, bright fringes can be seen on either side of the central maximum when a grating is illuminated with light ( = 430 nm)
A 54 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to other is 1.5 {rm m}. Biometric measurements indicate that each hand typically..
A step-down transformer has 2000 turns on the primary and 300 turns on the secondary, what is the secondary voltage amplitude
Charges of -q and +2q are fixed in place, with a distance of 2.00mbetween them. A dashed line is drawn through the negative charge,perpendicular to the line between the charges. On the dashed line,at a distance L from the negative charge, there is..
A person who weighs 804 N steps onto a spring scale in the bathroom, and the spring compresses by 0.739 cm. What is the spring constant?
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