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1) At a rock concert, the sound intensity 1.0 m in front of the bank of loudspeakers is 0.10 W/m^2. A fan is 30 m from the loudspeakers. Her eardrums have a diameter of 8.4 mm.
How much energy is transferred to each eardrum in one second?
E=______J
2) A wave travels along a string at speed 267 m/s. What will be the speed if the string is replaced by one made of the same material and under the same tension but having twice the radius.
v=____m/s
The bob of a simple pendulum that is 1.00m long is held so the sting is horizontal and just taut. How fast is the bob moving when the string makes a 30.0degree angle with the vertical
In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
The escape velocity of a bullet from the surface of planet Y is 1951 m/s. Calculate the escape velocity from the surface of planet X
As the sun rises over a still pond, an angle will be reached where its image seen on the water's surface (n(subw)=1.333) will be completely polarized in a plane parallel to the surface. What is the angle between the reflected and refracted beams
What is the magnitude of the apparent weight of a 83 astronaut 4600 from the center of Earth's Moon in a space vehicle moving at constant velocity.
The coefficient of static friction between the 3000 lb car's tires and the road is 0.5. Determine the steepest grade the car can drive up at constant speed if car has (a) rear=wheel drive; (b) front-wheel drive; (c) four wheel drive.
Suppose 1.0 mol of a monatomic ideal gas initially at 10 L and 307 K is heated at constant volume to 614 K, What is the efficiency of the cycle
A 2.23-m-long rod, as measured in its rest frame, speeds by you longitudinally at 6.11 × 107 m/s. By how many millimeters do you determine the rod has contracted
A 300g rock tied to a string is rotated in a vertical circle (up and down, so gravity is important) with radius 0.5m. what is the rotation rate of the rock
The potential difference between the plates of a capacitor is 180V. Midway between the plates; a proton and an electron are released. The electron is released from rest.
A flashlight uses batteries that add up to 4.5 V and has a power output of 0.56 W. How much current is drawn from the batteries
define the rock's tangential deceleration. You want to visit your friend in Seattle during spring break. To save money, you decide to travel there by train. Unfortunately, your physics final exam took the full 3 hours.
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