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Q. Two loudspeakers are placed at either end of a gymnasium, both pointing towards each other. The sound emitted by the speakers is in phase and are of frequency of 256 Hz. An observer midway between speakers experiences an intensity maximum. How far have to an observer walk towards one of speakers to experience the first intensity minimum?
A 9300 kg boxcar travelling at 23 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 15 m/s. What is the mass of the second car.
An asteroid is discovered heading straight toward Earth at 13 km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 min, after which the asteroid is moving at 26 degree to its original path at..
After being accelerated to a speed of 1.7×10 5 m/s, the particle enters a uniform magnetic field of strength 1.00 T and travels in a circle of radius 35.0 cm (determined by observing where it hits the screen as shown in the figure). The results of th..
If, as is typical, each of them breathes about 500 {rm{ cm}}^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year.
A factory worker pushes a 30kg crate a distance of 4.50 meters along a level floor at constant velocity by pushing it downward at an angle of 30degrees below the horizontal. The coefficient of kinetic friction between the crate and the floor is 0...
A 246 kg wooden raft floats on a lake. When a 80kg man stands on the raft, it sinks 4cm deeper into the water. When he steps off, the raft vibrates for a while.
An ore car of mass 4 000kg rolls downhill on tracks from a mine. At the end of the tracks, 10 m lower in elevation, is a spring with k = 400 000 N/m. How much is spring compressed in stopping the ore car? Ignore friction.
How many 65W light bulbs can be connected in parallel across a potential difference of 85 V before the total current in the circuit exceeds 2.10A.
A 2.8 kg rectangular air mattress is 2 m long, 0.5 m wide, and 0.1 m thick. What mass can it support in water before sinking.
find electric field produced by the particles equal to zero. Find out the x and y components of this force.
What power is dissipated in a single light. A proton is fixed in place. An electron is released from rest and allowed to collide with the proton. Then the roles of the proton and electron are interchanged, and same experiment is repeated. Which is ..
Monochromatic light ( = 630 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.20 m from the slits. It shows the interference pattern observed on the screen. What is the slit separatio..
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