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A soap fil (n=1.33) is 465 nm thick and lies on a glass plate (n=1.52). Sunlight, whose wavelengths (in vacuum) extend from 380 to 750 nm, travels during air and strikes the film perpendicularly. For which wavelength(s) in this range does destructive interference because the film to look dark in reflected light?
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.
When an atom emits a photon in a transition from a state of energy E1 to a state of energy E2, Evaluate this recoil energy for the n = 2 to n = 1 transition of hydrogen.
a circuit consists of a resistor in series with an inductor and an ac generator that supplies an rms voltage of 115 v.
Calculate the period T and the tension in the string F as a function of the angle. Compute the moment of inertia of this system for an axis that passes through the combined center of mass and is perpendicular to the plane of the rings.
A 7.00 kg bowling ball moves at 2.30m/s. How fast must a 2.60g Ping-Pong ball move so that the two balls have the same kinetic energy.
With what minimum speed must you toss a 100 g ball II str aig ht up to just barely hit the I O-m-high ceiling of the gymnasium, With what speed does the ball hit the floor
A standing wave is established in a 85 cm long string fixed at both ends. The string vibrates in four segments when driven at 190 Hz. Decide the wavelength. What is the fundamental frequency of the string?
Automobile windshield wipers can be used intermittently during rainfall. what determines the length of the intervals when the wiper is on and when it is off
A car changes it speed from rest to 12 km/hr in 4sec .If the mass of the car is 2000 killograms what is the net force acting on the car
A cannonball is shot (from ground level) with an initial horizontal velocity of 40 m/s and an initial vertical velocity of 21 m/s, What is the initial angle of the cannonball with respect to the ground
block 2 (mass 1.0 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of springconstant 200 N/m. The other end of the spring is fixed to a wall.Block 1 (mass 2.0 kg), traveling at speed 4 m/s, collides with block..
Suppose a news report stated that starship Enterprise had just returned from a 5 year voyage while traveling at 0.81c. how much time elapsed on the ship
In the Bohr model of the hydrogen atom, an electron in the 7th excited state moves at a speed of 4.47 104 m/s in a circular path having a radius of 2.59 10-9 m
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