A cow that is 2 meters long watches a train passing at 90% of the speed...

A cow that is 2 meters long watches a train passing at 90% of the speed of light. According to the cow the train measures 15 meters.

What is the factor  of temporal expansion between time in the benchmark of the cow and time in the benchmark of the train?

b. How tall is the cow according to the train passengers? vs.

How long does the train take to pass the cow according to the cow?

d. According to the train passengers, how long does the train take to pass the cow?

e. According to the passengers of the train, how long is the train?

f. How long does the nose of the train take to pass the cow according to the cow?

g. How long does the nose of the train take to pass the cow according to the train passengers?

Expert Solution

genius_generous answered 2 years ago

A very metal train moving at a constant speed is passing a hippie observer on a...

A very metal train moving at a constant speed is passing a hippie observer on a platform. On one of the train cars, a Deathcore guitarist is continually hammering out a note at a frequency of 450 Hz. After the guitarist has passed, the hippie hears the sound with a frequency of 420 Hz. What is the speed of the train? Please explain work, I always rate!!:)

A rocket of rest length 90 meters is traveling at speed 4/5c directly away from earth....

A rocket of rest length 90 meters is traveling at speed 4/5c directly away from earth. The rocket encounters an asteroid of length 80 meters also travelling directly away from the earth but at speed 3/5c. a)According to the captain of the rocket, what is the velocity of the rocket relative to the asteroid? b)At the front of the rocket, the captain of the rocket becomes aware of the asteroid and activates a warning signal. It takes one hour before...

A train runs between 2 stations, 2 km apart at a average speed of 40kmph. The...

A train runs between 2 stations, 2 km apart at a average speed of 40kmph. The train is made to run according to the quadrilateral speed time curve. If the max speed is to be limited to 60 kmph, acceleration to 2 kmphps, coasting retardation to 0.15 kmphps and the braking retardation to 3 kmphps. Determine the duration of acceleration, coasting and braking.

(1) An air track that is 2 meters long is raised by 2 cm on one...

(1) An air track that is 2 meters long is raised by 2 cm on one end. What vertical distance does an air cart move if the air cart moves from the 1 meter mark to the 2 meter mark? 1 cm (2) If the above air cart starts from rest, what would you expect its velocity to be 0.5 meters along the air track? Use the equations of conservation of energy. Assume the air track is frictionless. (3) Is...

A commuter train passes a passenger platform at a constant speed of 38.1 m/s. The train...

A commuter train passes a passenger platform at a constant speed of 38.1 m/s. The train horn is sounded at its characteristic frequency of 340 Hz. (a) What overall change in frequency is detected by a person on the platform as the train moves from approaching to receding? (Indicate whether the frequency increases of decreases with the sign of your answer.) Hz (b) What wavelength is detected by a person on the platform as the train approaches? m

A 130 m long train was coming into a station. The train decelerated at a rate...

A 130 m long train was coming into a station. The train decelerated at a rate of 0.150 m/s2 as it entered the station. The station was 210 m long. a) The driver managed to stop the train when the tail of the train reached the end of the station. What was the entering velocity of the train into the station? [2.5 marks] b) If the driver wanted to stop the train at the middle of the station, what should...

Design a speed-increasing gear train with a speed ratio of SPR defined below: Speed ration =...

Design a speed-increasing gear train with a speed ratio of SPR defined below: Speed ration = 13 The gear train does not need to be reverted. Specify the appropriate numbers of teeth to minimize the gearbox size while avoiding the interference problem in the teeth. Perform the analysis subject to the following constraints: A) Use a 20° pressure angle and match SPR exactly. B) Use a 25° pressure angle and match SPR exactly. C) Use a 20° pressure angle and...

A rectangular room is 12 meters long, 6 meters wide, and 3 meters high. 1] Calculate...

A rectangular room is 12 meters long, 6 meters wide, and 3 meters high. 1] Calculate the first three axial modes for the length of the room. 2] Find the wavelength, then convert to frequencies, assuming that the speed of sound in the room is 343 m/s. 3] Calculate the first 3 axial modes [Wavelenghts and frequencies] for the width of the room. 4] Calculate the first axial modes [Wavelenghts and frequencies] for the height of the room. It is...

The photogates in the experiment are used to determine the speed of the gliders passing through....

The photogates in the experiment are used to determine the speed of the gliders passing through. The photogates measure the time it takes for the photogate beam to go from being unblocked to blocked to unblocked again. You tell the photogate how long your glider is, and the speed is then calculated. Given the description of what the photogates do, how will you determine the velocity of the glider?

Train driving 5 % uphill (2.9o) with speed 120 km/h. Train total mass is 100 000...

Train driving 5 % uphill (2.9o) with speed 120 km/h. Train total mass is 100 000 kg. The gear ratio is 1 (no transmission) and the train wheel diameter is 1 m. (Give the answer of accuracy of at least three significant digits.) Calculate the required torque: Answer kNm Calculate the required power:

Question