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A single mass (m1 = 3.6 kg) hangs from a spring in a motionless elevator. The spring constant is k = 294.0 N/m. Now, three masses (m1 = 3.6 kg, m2 = 10.8 kg and m3 = 7.2) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above. Now the elevator is moving downward with a velocity of v = -2.6 m/s but accelerating upward at an acceleration of a = 3.9 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.) What is the distance the lower spring is extended from its unstretched length?
A 57.0-g tennis ball is traveling straight at a player at 21.0 m/s. The player volleys the ball straight back at 25.0 m/s. what average force acts on the ball
A 120-V fish tank heater has a power rating of 112 W. Calculate the resistance of the heater and Calculate the current through the heater
A 20 kg satellite has a circular orbit with a period of2.4 h and a radius of 8.0 × 106m around a planet of unknown mass. what is the radius of the planet
A person pushes on a stationary 125 N} box with 69N at 30degrees below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 1.20. What is the normal force on the box?
The earth's magnetic field is approximately 30 microTesla. An AC transmission wire carries a current of 10 A (RMS). What is the peak current in the wire? What is the maximum force per meter in the wire?
A hockey puck B rests on a smooth surface of ice and is struck by a second puck A , which was originally traveling at v= 40.0m/s, What fraction of the original kinetic energy of puck A dissipates during the collision
As a function of time, the velocity of the football can be written as . (If the acceleration of an object is constant, find the average acceleration vector of the football
If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/6 of the escape speed
A 47 kg skier starts from rest at height H = 19 m above the end of a ski-jump ramp as shown. as theskier leaves the ramp, his velocity makes an angle theta= 29 above the horizontal. neglect air resistance and friction. calculate the speed of the s..
A particle ( m = 1 kg ) moves on the x axis. The initial position isx= 0 and the initial velocity isv(0) = 5m/s. Determine the final velocity of the particle
A cannon with mass of 2000kg fires a 10kg shell at an angle of 60 degrees above the horizontal. what is the velocity of the cannon ball
The simple harmonic oscillator can be used as a model for the vibration of a diatomic molecule. Mass and Force Constant are on the order of 10^?26 kg and 10^3 N/m. This model will work if the temperature is sufficiently low (we assume it is in the gr..
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