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A chair of weight 140 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F= 44.0 N directed at an angle of 39.0 degrees below the horizontal and the chair slides along the floor.
Using Newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair.
The electric gun in a TV tube is to accelerate electrons (m=9.1 X 10 (-31) kg) (charge= 1.6 X 10 (-19)) from rest to 3.0 X 10(7) m/s within a distance of 2.0 cm. What electric field is required
A certain freely falling object, released from rest, requires 1.50 s to travel the last 30.0 m before it hits the ground. Find the velocity of the object when it is 30 m above the ground
A mass-spring system is in simple harmonic motion. It has a spatial frequency F and amplitude A. what fraction of the system energy is kinetic
Scientists in a laboratory produce a sound wave in a simulated environment (air) with a velocity of 448 m/s. What is the temperature (in Kelvin) of the environment
An electromagnetic wave in a vacuum has an instantaneous magnetic field strength of 0.000000735 T at a certain point. What is the instantaneous electric field strength of the wave at this point
a sample containing beryllium atomic mass 9 u aluminum 27 u and an unknown element is placed in a mass spectrometer.
Two boats start together and race across a 56-km-wide lake and back. Boat A goes across at 52 km/h and returns at 56 km/h. Boat B goes across at 36 km/h, and its crew, realizing how far behind it is getting, returns at 79 km/h. Turnaround times are n..
A barge with a mass 1.50 X 10^5 kg is proceeding down river at6.2 m/s in heavy fog when it collides broadside with a bargeheading directly across the river. What are the speed and direction of motion of the first barge
An archer shoots an arrow with a velocity of 48.0 m/s at an angle of 46.5° with the horizontal. What is the initial speed of the apple
A small block with a mass of 0.170 kg is attached to a cord passing through the hole in a frictionless, horizontal surface .The block is initially revolving at a distance of 0.50 m from the hole with a speed of 0.80 m/s. The cord is then pulled from ..
At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81 m/s^2 .
A square loop with 80 tight turns and sides 15 cm is made with cooper wire a diameter 1.2 mm. determine the current induced in the loop
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