Exam Final FISI-3171 Dr. LU Write your answers on the answer sheets) 1- A car is

Question

Exam Final FISI-3171 Dr. LU Write your answers on the answer sheets) 1- A car is moving along a street at 15.0 m/s A 200m-long train is moving at 10.0 m/s, in the same direction parallel to the street. How long will it take for the car to go from the tail to the front of the train? (10 points) 2- A piece of wood floats with half his volume above water. If its mass is 2.0 kg, calculate its density. (10 points) 3- A satellite is in a circular orbit around the center of the Earth, with an orbital radius that is times the radius R of the Earth. Determine the acceleration of the circular motion of the satellit (10 points) 4- An external force F, with a magnitude of 80 N, acts on a block mass 10.0 kg parallel to a plane with an angle of 30.0 deg shown. The block is observed to move at a constant velocity of 4 m/s up the plane. Calculate the coefficient of kinetic friction betw -the block and the plane. (10 points) 5-An ideal gas expands isothermally, performing 2800 J of work in the pr heat absorbed during this expansion. (10 points) 5- An ideal gas expands isothermally, performing 2800 J of work in the process. Calculate 6- A 100 g ball moving to the right at 90 m/s makes a head-on collision with a 200 moving to the left at 30 m/s. After the collision the 100 g ball moves to the right a1 Determine if the collision is elastic or inelastic. (10 points) 7- A football is kicked at ground level with a speed of 25.0m/s at an angle of 38.0 horizontal. What is its acceleration at the highest point? Ignore air friction. (10 points) 8- A typical steel B-string in a guitar resonates in its fundamental frequency at 240 length of the string is 0.750 m. What is the wavelength of the fifth harmonic of the gui described above? (10 points) na smath horizontal surface at 2.5 m/s and collides wit s ho cpring is 330

Explanation / Answer

The 2 equations from Free Body Diagram we can get are:

u = coeff of kinetic friction, a = acceleration = 0 , m=mass

Equating F -umg cos(theta) - mg sin(theta)= ma parallel to the plane is :

a = 0

F - mgsin(theta) = umg cos (theta)

Put values:

u = ( 80 - 10*9.8*sin(30 degrees)) /(10*9.8 * cos(30 degrees))

u = 0.3652

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