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A long rope is suspended from the ceiling. Waves are started from the bottom traveling up the rope. It is observed that their speed changes as they move up the rope. Do they get faster or slower? Explain why this occurs.
An MP3 player operates with a voltage of 3.7 V, and is using 0.28 W of power. Find the current being supplied by the player's battery.
A projectile is fired up into the air at a speed of 199 m/s at an angle of 17° relative to the horizontal. Determine the maximum height the projectile will reach
A flashlight bulb with a potential difference of 6.0 V across it has a resistance of 8.5 W. How much current is in the bulb filament
A 75 human sprinter can accelerate from rest to 10 in 3.5 . During the same interval, a 34 greyhound can accelerate from rest to 17, evaluate the average power output for each
An ?-particle has a charge of +2e and a mass of 6.64 ? 10-27 kg, What is the speed of the ?-particle and What is the radius of its circular path
What is the horizontal distance x to the base of the wall supporting the mirror of the near point on the floor that can be seen reflected in the mirror . What is the speed of the third fragment? Overlook effects due to gravity.
A 24-V battery is connected in series with a resistor and an inductor, with R = 4.2 ? and L = 6.0 H, respectively. Find the energy stored in the inductor when the current reaches its maximum value
Three point charges are arranged along the x axis. Charge q1= = -4.50nC is located at x=.25m and charge q2=3.00nC is at x=-0.330m. a positive charge q3 is located at origin. What must the value of q3 be for the net force on this point charge to hav..
In a tornado or hurricane, a roof may tear away from the house because of a difference in pressure between the air inside and the air outside. What is the magnitude of the force on the roof
A typical adult ear has a surface area of about 1.90 10-3 m2. How much power is intercepted by the ear
A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
A 12mm-high object is 10cm from a convex mirror with focal length 17cm. How far is its image from the mirror
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