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Q. Sound waves of frequency 569 Hz enter a window 1.25 m wide. The window is in the exact center of one wall of a theater 24 m by 12 m. The window is 12 m from the opposite wall, along which is a row of seats occupied by people. The theater is acoustically prepared to prevent the reflection of sound waves, and the speed of sound is 330 m/s. Two people, on each side of a line directly in front of the window, in the row along the wall hear no sound. What minimumdistance are they from each other? The angle may be too large to use small angle approximation. Answer in units of m.
The bullet remains in the block, and after the impact the block lands d = 1.90 m from the bottom of the table. How much time does it take the block to reach the ground once it flies off the edge of the table.
A helicopter is ascending vertically with the speed of 5.79. At a height of 127 above the Earth, a package is dropped from a window. How long take the package to hit the ground.
What is the new frequency of the string that was tightened. find the magnitude of the net force acting on the car during this time.
if a river flows due east at 1.68m/s. a boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 13.40m/s due north relative to the water. if the river is 178m wide, how far downstream is the boat when i..
A gymnast with mass m1 = 41 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 108 kg and length L = 5 m. Each support is 1/3 of the way from each end. at least the gymnast stands at the left end of..
The convex lens of a copy machine has a focal length of 25 cm. A letter to be copied is placed 40.0 cm from the lens.
An automobile tire has a radius of 0.330 m, and its centre moves forward with a linear speed of v= 15.0 m/s. Find the angular speed of the wheel.
A person weighs 689 N and the head is 53 N the average density of the person is 1010 kg/cubed meters how much force in N is required to keep a persons head out of the water.
what is the kinetic energy of the system. assume the roller coaster in Fig. 6-41 (h1 = 36 m, h2 = 14 m, h3 = 25) passes point 1 with a speed of 2.00 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it ..
Find an average magnitude of the induced emf . A bungee jumper, who's mass is 79 kg, jumps from a tall building. After reaching his lowest point, he continues to oscillate up and down, reaching the low point two more times in 8.2 s.
What is magnitude of the gravitational attraction
The inside of the cylindrical can shown above has cross-sectional area 0.005 m^2 and length 0.15 m. The can is filled with an ideal gas and covered with the loose cap. The gas is heated to 363K and some is allowed to escape from the can so that re..
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