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A single mass m1 = 4.5 kg hangs from a spring in a motionless elevator. The spring is extended x = 15.0 cm from its unstretched length.the elevator is moving downward with a velocity of v = -3.9 m/s but accelerating upward with an acceleration of a = 3.7 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)
What is the force the bottom spring exerts on the bottom mass?
What is the distance the upper spring is extended from its unstretched length?
What is the distance the MIDDLE spring is extended from its unstretched length?
The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, compute the speed of the sports car at impact.
Two cars are traveling along a straight line in the same direction, the lead car at 25.2m/s and the other car at 31.0m/s. At the moment the cars are 41.9m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.07m..
What is the value of h0? If the block were released from height 3h0 above the spring, Evaluate the maximum compression of the spring?
An electron is released a short distance above Earth's surface, the first electron just great enough to cancel the gravitational force on it, How far below the first electron is the second
Two soccer players, Mia and Alice, are running as Alice passes the ball to Mia. What is the magnitude and direction of the velocity of the ball relative to the ground
A projectile of mass 7 kg is fired with an initial speed of 193 m/s at an angle of 16? with the horizontal. At the top of its trajectory, projectile explodes into two fragments of masses 4 kg and 3 kg.
An electron is in the fifth Bohr orbit of hydrogen. Calculate the time required for the electron to circle the nucleus
Describe the 4 S reactor. Compare it to a traditional reactor, What are the advantages of nuclear power
A current of 0.500 A flows through an aluminum wire. The aluminum wire has a length of 2.00 m, what is the electron drift speed in the wire
The rod is initially at rest and oriented horizontally and then released so that it swings to the bottom. Illustrate what are all the forces acting on the rod?
A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. find the total distance between the object and the image
A solenoid that is 111 cm long has a cross-sectional area of 13.8 cm2. There are 958 turns of wire carrying a current of 7.62 A. Calculate the energy density of the magnetic field inside the solenoid
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