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1) Two trains are passing against each other. train A is going north with velocity of 76 km/hour. train B is going south with velocity of 152 km/hour. a passenger in train A see the smoke that emitted from his train chimney making an angle of 60 degrees from the west to the south. a passenger in train B see the smoke that emitted from his train chimney making an angle of 30 degrees from the south to the north. a) What is the velocity of the wind - in respect to the ground? the value of the velocity (of the wind) , and the direction (angle) of the velocity of the wind (how many degrees from the west to the south)
b) what is the velocity of the smoke of train A , in respect to viewer in train A?
c) what is the velocity of the smoke of train B, in respect to viewer in train B ?
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
A spring has an unstretched length of 12cm. When an 80 g ball is hung from it, the length increases by 4.0 cm.Then the ball is pulled down another 4.0 cm and released. a) What is the spring constant? b) What is the period of the oscillation?
gas in a cylinder moves a piston with area 0.200 m^2 as energy is slowly added to the system. find the displacement of the piston
Two people hear a tornado siren, What is the intensity level (in dB) at the farther listener relative to the other listener
The work function for indium is4.12 eV. Find the cutoff frequency for indium
A firehose 15 m long is uncoiled by pulling the nozzle end horizontally along a frictionless surface at the steady speed of 2.9 m/s. How much work has been done on the hose by the applied force
If the terminals of a battery are connected across two identical resistors in series, the total power delivered by the battery is 8.0 W. what is the total power delivered by the battery
A gold prospector finds a solid rock that is composed solely of gold and quartz. Evaluate what is the mass of the gold in the rock
A wrecking ball (weight = 4800 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3600 N. As support cable runs from the top of the boom to the tractor.
Descriube what are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?
A short cylindrical block of 6061-T6 aluminum, having an original diameter of 15mm and a length of 81mm, Determine the increase in its diameter
A space probe is fired as a projectile from the Earth's surface with an initial speed of 1.78 x 10^4 m/s. What will its speed be when it is very far from the Earth
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