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A worker drags a 150lb. crate across the floor by pulling on a rope inclined at 17degrees above the horizontal. The coefficient of static friction is 0.52 and the coefficient of kinetic friction is 0.35. What tension in the rope is required to start the block moving? If this tension is maintained, what is the acceleration of the crate?
Rhea, one of Saturn's moons, has a radius of 765 km, Calculate its mass and average density
A boy of mass 52.2 kg is initially on askateboard of mass 2.00 kg, moving at a speed of 9.8 m/s. The boy falls off the skateboard, and hiscenter of mass moves forward at a speed of 10.9 m/s. Find the final velocity of the skateboard.
Technetium-99 has an excited state that decays by emission of a gamma ray. The half-life o fthe excited state is 360 min. What is the activity, in curies, of 1.00mg of the excited isotope
In an attempt to escape his island, Gilligan builds a raft and sets to sea. The wind shifts a great deal during the day, What is the angle of his final position relative to the island
A billiard ball of mass m = 0.150 kg hits the cushion of a billiard table at an angle of ?1 = 60.0° at a speed of v1 = 3.00 m/s. It bounces off at an angle of ?2 = 63.0° and a speed of v2 = 2.10 m/s. a) What is the magnitude of the change in momentum..
A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 2.77 mT. what is the magnitude of the net force acting on the proton
A 3.0 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. What is the kinetic energy of the block as it passes through x = 4.3 m
A door is made of uniform material of density p and has a height of h, t thick, w wide. When the door is released from rest theta not from the doorframe, it swings closed on it's frictionless hinges time t1.
On a frictionless track, a 0.55 kg cart is traveling at 0.70 m/sec when it runs into a spring that is anchored to the end of the track. what is the original kinetic energy of the cart as it approached the spring
Water at 25 degrees celius is pumped from 100kPa to 5MPa in a pump with an efficiency of 75%, Calulate the temperature rise in the real pump
The eyepiece of a microscope has a focal length of 1.25 cm and the objective lens focal length is 1.62 cm. what is the angular magnification of the microscope
an arrow is shot at an angle of theta45 degrees above the horizontal. the arrow hits a tree a horizontal distance d220m
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