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A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of
0.500 m/s relative to a stationary observer while the belt moves at a constant
speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is
0.400, the magnitude of the work, in J, done on the block by the force of friction
in 8.00 s is
A body is propelled through a viscous medium with a speed of 300 cm/sec. On the propelling force being suddenly removed, it comes to rest after covering a distance of 45 metres. What is its relaxation time? How long would it be before its speed falls to 30 cm/sec.
Dr. John Paul Stapp was U.S. Air Force officer who studied the effects of extreme deceleration on the human body. On December 10, 1954, Stapp rode a rocket sled, accelerating from rest to a top speed of 282 m/s (1015 km/h) in 5.00 s, and was brought jarringly back to rest in only 1.40 s!
A boy on board a cruise ship drops a 30.0 gm marble into the ocean. If the
resistive force proportionality constant is 0.500 kg/s, what is the terminal speed
of the marble in m/s?
An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature?
Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?
A particle is projected at 20m/s in a direction 25 degrees above the horizontal (it has zero velocity in the vertical direction)
What maximum height does the particle reach?
What is the horizontal distance the particle has travelled when it reachrs its maximum height?
a 10kg box sits on a slope at an angle of 15 degrees:
What is the normal reaction force the slope exerts on the box.
What is the component of the weight parallel to the slope.
If The box accelerates down the slope at 0.5m/s2, calculate the magnitude of friction.
Give five examples of constraint and its types
Comet d'Arrest was discovered in June 28, 1851 and its orbit about the sun has a semimajor axis a = 3.49 AU. Recently it was observed that the comet has a velocity vc = 0.45V E ev when it was spotted at position rc = 2.91RE er from the sun at which the velocity vector vc makes an angle ϕ = 60o with vector rc (VE and RE = 1 AU are the average speed and radius of the Earth orbital motion around the sun respectively). Calculate i. the eccentricity of the comet's orbit. ii. the period of the comet in Earth years. iii. the perihelion, aphelion and the latus rectum of the orbit.
