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A rock of mass 43 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 257 N. What is the magnitude of the acceleration of the rock?
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
The Lunar Lander of mass 1.9Ã?104kg made the last 150m of its trip to the Moon's surface in 120s, determine the upword force required to decend at a constant speed
Two long parallel wires carry currents of 2.83 A and 5.41 A. Find the separation distance of the wires expressed in millimeters
a large rectangular tub is filled to a depth of 2.60 m with olive oil, which has density 915 kg/m^3. find the force of air pressure on the surface of the oil
The potential difference across a cell membrane from outside to inside is initially at -90 mV (when in its resting phase). How many ions move through the membrane
Two spaceships approach Mars from the same direction. One has a speed of 0.2c, What is the speed of one spaceship relative to the other
An elevator is moving up at a constant velocity of 2.5 m/s Calculate the force the floor exerts on the passenger, Calculate the force the floor exerts on the passenger
A 2.0 kg pendulum bob on a string 1.5m long is released with a velocity of 0.0 m/s when the support string makes an angle of 60 degrees with the vertical. What is the tension in the string at the bottom of the swing?
A certain freely falling object requires 1.10s to travel the last 32 m before it hits the ground. From what height above the ground did it fall.
An object with a mass of m = 4.8 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.225 m, Determine the magnitude of the acceleration of the object
Consider an airplane that normally has an air speed of 90 km/h in a 95 km/h crosswind blowing from west to east. Calculate its ground velocity when its nose is pointed north in the crosswind.
A 62 driver gets into an empty taptap to start the day's work. The springs compress 1.5×10?2 . What is the effective spring constant of the spring system in the taptap
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