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Q. Two speakers, one directly behind the other, are each generating a 275 Hz sound wave. 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.
Q. A 0.7 kg block of ice is sliding by you on a very slippery floor at 4 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.003 seconds. The block eventually slides at an angle of 27 degrees from its original direction (labelled in the diagram). The overhead view shown in the diagram is approximately to scale. The arrow represents the average force your toe applies briefly to the block of ice.
What is the unit vector in the direction of the block's momentum after the kick?
While a roofer is working on a roof that slants at 44.0 above the horizontal, he accidentally nudges his 93.0 toolbox, causing it to start sliding downward, starting from rest.
An 82 kg lumberjack stands at one end of a 355 kg floating log. Both the log and the lumberjack are at rest initially. If the lumberjack now trots toward the other end of the log with a speed of 2.70 m/s relative to the log, what is the lumberjack's ..
A space vehicle is travelling at 5800 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 74km/h relative to the command module. The mass of the motor is four times the mass of the module. What i..
A spacecraft receding from he earth at 0.97c transmits data at the rate of 1*104pulses/s. At what rate are they received.
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.6m/s at ground level. Its engines then fire and it accelerates upward at 3.80 m/s2 until it reaches an altitude of 930m. At that point its engines fai..
If the light from the spotlight strikes the mirror at an angle to the normal, what angle to the normal would you expect for the reflected rays.
A radio telescope, whose two antennas are separated by 55 , is designed to get 3.0- radio waves produced by astronomical objects.
As part of a safety investigation, two 1800 cars travelling at 18 are crashed into different barriers. Find an average forces exerted on (a) car that hits a line of water barrels and takes 1.80 to stop, and (b) car that hits a concrete barrier and ta..
In a head-on collision, a car stops in 0.29 {s} from the speed of 28 {m/s}. The driver has a mass of 78 {kg}, and is, fortunately, tightly strapped into his seat. what force is applied to driver during that fraction of a second.
A small remote-control car with a mass of 1.59 kg moves at a constant speed of v = 12.0 m/s in a vertical circle inside a hollow metal cylinder that has a radius of 5 m.
Sketch on Eratosthenes' method, if two observers are due north and south of each other and are separated by 700 km, what is the circumference of their spherical world if they see same star on their meridian at altitudes of 26 degrees and 47 degrees r..
A 12.0 m long conveyor belt, inclined at 40.0°, is used to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has the mass of 1.00 kg, and there are 26 newspapers per bundle. Concl..
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