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Q1. A cord is used to vertically lower an initially stationary block of mass M kg at a constant downward acceleration of g/4. The block has fallen a distance d. (Use any variable or symbol stated above as necessary.)
(a) Find the work completed by the cord's force on the block.
(b) Find the work completed by the weight of the block.
(c) Find the kinetic energy of block.
(d) Find the speed of block.
Q2. A copper block is removed from a 300^0 C oven and dropped into 1 L of water at 20.0^0 C. The water quickly reaches 25.5^0 C and after that remains at that temperature. What is the mass of copper block?
A dentist's mirror is placed 2.5 cm from a tooth. The enlarged image is located 6.1 cm behind the mirror. What kind of mirror (plane, concave, or convex) is being used
a 25-N block slides down a plane inclined at 21.2 degrees to the horizontal with constant velocity. find the total force resisting the motion of the block
An electron is moving east in a uniform electric field of 1.53N/C directed to the west. What is the speed of the proton at point B
Calculate the electric force Fe between a stationary proton and uranium nucleus...separated by a distance of 3.6 nm, determine the intial acceleration of the proton
A weather vane initially at rest has a moment of inertia of 0.116 kg · m2 about its axis of rotation. Find the angular velocity of the weather vane just after it is struck
An electron is moving northwards with a velocity 10^7 m/s in a magentic feild of 3T directed eastwards. Calculate the instaneous force on the electron
A 300 g block on a 50.0 cm -long string swings in a circle on a horizontal, frictionless table at 60.0 rpm, What is the speed of the block
A railroad car of mass 2.44 104 kg, is moving with a speed of 3.96 m/s. It collides and couples with three other coupled railroad cars, What is the speed of the four cars after the collision
You have been employed by the local circus to plan their human cannonball performance. For this act, a spring loaded cannon will shoot a human projectile, the Great Flyinski, across the big top to the net below. What do you tell the ringmaster
A closed cylindrical tank has a height of 0.77m. The tank is at first filled with air at a pressure of 2.00 atm. Water is pumped into the tank until the air pressure reaches 6.1 atm. The temperature is constant. Find out the height of the compress..
q1. megans mass is 30 kg. she climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 ms at the bottom of the
Robert has just bought a new model rocket, and is trying to measure its flight characteristics. how much work is done by the drag force on the rocket during its ascent
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