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a branch is wedged under a rock and rests on a small object. the small object is 1.5 m from the large rock and the branch is 11.0 m long. if the mass of the branch is 18.0 kg what force must be exerted on the smaller rock?
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
A moving 4.10 kg block collides with a horizontal spring whose spring constant is 260 N/m. The block compresses the spring a maximum distance of 15.00 cm from its rest position.
Various voltages V are applied across a resistor and for each value of V the current I through the resistor is measured, What is the resistance R of the resistor
A plane accelerates from rest at a constant rate of 5.00 along a runway that is 1800 long. What is the time needed to take off
What's the definition of quantum physics, in layman's terms?
A circular loop of radius 21 cm is located in the plane of the paper inside a homogeneous magnetic field of 0.7 T pointing into the paper, Calculate the current induced in the loop in A during that time
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
In an attempt to reduce the extraordinarily long travel times for voyaging to distant stars, some people have suggested traveling at close to the speed of light. How fast must the rocket travel relative to earth
Two positive point charges, each 17? C, lie along the x-axis at x = –0.12m and x = +0.12m.
As a baseball is being caught, its speed goes from 25 to 0 m/s in 0.008 seconds. What is the force acting on the ball
A simple harmonic oscillator has an amplitude of 5cm, a spring constant of 5.0N/m, and a maximum speed of 10 m/s. What is the speed when it reaches half of the amplitude
q1. two speakers one directly behind the other are each generating a 374-hz sound wave. what is the smallest parting
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