(A) car has a length of 6m and is travelling at speed of 95km/hr. What is...

(A) car has a length of 6m and is travelling at speed of 95km/hr. What is its Reynolds number?(5s.f , tolerance +/-500)

(B) for Concorde SST plane, how far could it actually glide in km?(3s.f), (has lift/drag ratio of 6:2, engines failed at altitude of 17500m and can make it to airport 106km away)

Expert Solution

(A) Reynold's number , R_e= UL/v

U= Speed of car in m/s = 95*0.27778 = 26.3891 m/s

L = length of the car = 6 m

v = kinematic viscosity of air = 1.5 * 10^-5 m²/s

R_e = 26.3891/ v = 1.759273 * 10⁶

(B) lift to drag ratio = 3: 1 ( means every 3 miles it travels forward losses an altitude of 1 mile)

1 mile = 1.60934 Km

distance to airport = 106km

current altitude = 17.500 Km

Based on the ratio given, the flight need 21.955 times to loss its altitude for travelling to 106 Km. But at 10.8 altitude will become 0.

flight will glide until 53.856 Km, then it will loss the altitude completely

samet mamat answered 2 years ago

A car travelling at constant speed passes by a stationary pedestrian as the car driver sounds...

A car travelling at constant speed passes by a stationary pedestrian as the car driver sounds the horn. As the car approaches the pedestrian she hears the horn sounding at 50 Hz. Once the car has driven past her, she hears the horn sounding at 10 Hz. Calculate the frequency in Hz of the sound waves emitted by the car horn.

A car with mass 1309 kg is travelling north at a speed of 28.9 m/s. It...

A car with mass 1309 kg is travelling north at a speed of 28.9 m/s. It collides at right angles with a truck (m=2733 kg) travelling east at 16.6 m/s and the two vehicles stick together after the collision. How much kinetic energy is lost during the collision?

A 3-Kg toy car travelling initially with a speed of 20.0 m/s in the east direction...

A 3-Kg toy car travelling initially with a speed of 20.0 m/s in the east direction crashes into a 5.0 kg toy truck moving in the west direction 30.0m/s The velocity of the car right after the collision is 15.0m/s to the west. What is the velocity of the truck right after the collision.

The driver of a car travelling 75.0 km/hr suddenly sees road construction up ahead. She takes...

The driver of a car travelling 75.0 km/hr suddenly sees road construction up ahead. She takes 2.30 s to begin applying the brakes. The car slows down at a constant rate of 10.0 km/hr/s for until she comes to a stop. a. Draw a picture showing the various intervals of the car’s motion and accelerations. b. Calculate the average acceleration of the car after the driver applies the brake. c. What is the total distance the car...

A train, travelling with velocity v = 0.8c, enters a tunnel. The train has proper length...

A train, travelling with velocity v = 0.8c, enters a tunnel. The train has proper length 100m and the tunnel has proper length 80m. When the center of the train coincides with the center of the tunnel, two gates located at either end of the tunnel come crashing down. The three events (the center of the train reaching the center of the tunnel, the front gate closing and the rear gate closing) occur simultaneously in the stationary reference frame. a)...

If Sally could drive a Jetson's flying car at a constant speed of 530.0 km/hr across...

If Sally could drive a Jetson's flying car at a constant speed of 530.0 km/hr across oceans and space, approximately how long (in years) would she take to drive to a solar system object 10.0 AU away?

1 – Consider the car-caravan analogy. In this problem, assume a propagation speed of 70 km/hr...

1 – Consider the car-caravan analogy. In this problem, assume a propagation speed of 70 km/hr and that each toll booth takes 6 seconds to service a car. Suppose the caravan of 10 cars begins immediately in front of the first toll booth, travels 50 km to a second toll booth, then another 50 km to a third toll booth, and finally stops immediately after the third tool booth. Thus, they travel a total of 100 km. What is the...

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car? Express the speed with the appropriate units.

A box of mass 5kg moves to the left at a speed of 6m/s. The box...

A box of mass 5kg moves to the left at a speed of 6m/s. The box is moving toward an unstretched spring of spring constant 500N/m that is attached to a barrier. If the floor is frictionless, how much does the spring compress in bringing the box to rest? If instead the floor has a coefficient of friction of 0.4, how much does the spring compress in bringing the box to rest?

The speed of the two planes is 52.7 m/s, with the first plane travelling at this...

The speed of the two planes is 52.7 m/s, with the first plane travelling at this velocity in the y-direction and the second plane travelling with this speed in the x-direction. The initial separation of the planes is 30.5 m. Find the time at which the separation of the planes is at its minimum.

Question