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What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Assume that the speed of sound is 335 m/s.
The sound level of some music is [06] units of W/m2 . 3-5. I am sitting 2.37 m from a speaker listening to some music. How close to the speaker should I sit if I want the music to be [07] dB louder?
Calculate the potential V(r) for r > r_{rm b}. (Hint: The net potential is the sum of the potentials due to the individual spheres.)
A rocket of total mass 3180 kg is traveling in outer space with a velocity of 115 m/s toward the Sun. It wishes to alter its course by 33.0°, and can do this by firing its rockets briefly in a
What is the energy source? Of normal galaxies What causes the Red Shift? QSOs are matter violently ejected from galactic nuclei. Recall M87 Why only Red Shifts?
When a plane turns, it banks as shown in the figure to give the lifting force of the wings a horizontal component that turns the plane.If a plane is flying level at 940 and the banking angle is not
What is the horizontal acceleration of ball thrown vertically upward inside an accelerating train?
Carrying a book Holding up a wall What if you push a car at constant speed? Can work be negative? What if = 180o? Lifting work: Work = mgh So what is energy?
We observe a hydrogen spectral line of Polaris (the North Star) with a wavelength of 6562.48 , which in the labA oratory is measured to be at 6562.85. What is the radial velocity A of Polaris?
What is its kinetic energy just before it hits the ground? Z A ball of mass 0.25 kg is thrown straight up with initial velocity 2.0 m/s. What maximum change in potential energy does it achieve?
Each of the two lines has a resistance of 5 ohms. What is the voltage change along each line? (Think carefully. This voltage change is along each line, not between the lines.)
Calculate the magnitude of the magnetic force exerted on a 259 m length of wire if the current in the wire flows horizontally toward the south.
A 1.7-m-long wire carries a current of 6.3 A and is immersed within a uniform magnetic field B. When this wire lies along the +x axis [i.e., the current is directed in the +x direction], a magnetic
What were the principles of the Kyoto accords? Which are products of burning fossil fuels in the atmosphere? How far above the Earth would we find the highest concentration of "good" ozone?
Apply Ampere"s Law to the rectangular imaginary loop in the yz plane shown. What does this tell you about Bz, the z-component of the Bfield outside the solenoid?
An Atwood's machine consists of blocks of masses m1 = 10.1 kg and m2 = 18.4 kg attached by a cord running over a pulley as in the figure below. The pulley is a solid cylinder with mass M = 8.30 kg
The velocity graph is approaching the t-axis and will eventually equal zero for velocity which means the object is slowing down. Acceleration decreasing? Slowing down?
A small, 300 cart is moving at 1.50 on an air track when it collides with a larger, 1.00 cart at rest. After the collision, the small cart recoils at 0.840 .What is the speed of the large cart after
A school yard teeter-totter with a total length of 5.5 and a mass of 36 is pivoted at its center. A 19 child sits on one end of the teeter-totter. Where should a parent push vertically downward with
A car with a mass of 1.50 x 10^3kg starts from rest and accelerates to a speed of 18.0 m/s in 12.0s. Assume that the force of resistance remains constant at 400.0 N during this time. What is the a
Sketch a diagram showing these rays entering the eye and proceeding to the retina. What does the observer see as a result of just these rays?
On a hot day in Las Vegas, an oil trucker loaded 9785L of fuel. He encountered cold weather on the way to Utah, where the temperature was 23K lower than Las Vegas, and where he delivered his entire
A gun shoots bullets that leave the muzzle with a speed of 338 m/s. If a bullet is to hit a target 104 m away at the level of the muzzle, the gun must be aimed at a point above the target. How far
What must the velocity of the satellite be for it to go around in a circular orbit? How long will it take to go around once?
If the sound intensity falls through one complete cycle every 5.50 seconds. The crests in the room is 1.121010W/m2 , what is the intensity outside?