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A small light has a 1.0 V, 4.8 W bulb that is powered by a transformer concocted to a 120 V dc power source. The secondary coil of the transformer has 20 turns of wire.
A. How many turns does the primary coil have?
B. What resistance is needed in the light to produce a power of 1.0 W?
A projectile is fired at time t = 0.0 s, from point 0 at edge of a cliff, with initial velocity components of vix=30m/s and viy = 100m/s. The projectile rises, and then falls into the sea at point P. The time of flight of the projectile is 20s.
Find the electric field at the position of the electron. What is the potential difference in volts between the plates.
consider two solid disks of identical radius and thickness. one of the disks is made of aluminum (density=2.7g/cm), what is the ratio between the two moments of inertia
Two events in reference frame S occur 10?s apart at the same point in space. The distance between the two events is 2400 m in reference frame S?, What is the time interval between the events in reference frame S? ?
Hakeem throws a 10.50 g ball straight down from a height of 2m. The ball strikes the floor at a speed of 7m/s. What was the initial speed of the ball? Presume that air resistance is negligible.
A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 5.0 x 10^6 g at a distance of 4.00cm from the axis. What angular velocity in rev/min is necessary.
You are 1.5 m tall and you are standing 2.0 m away from a flat mirror. The Top of the mirror is at the same level as the top of your head. How large is the mirror
A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower, What is the height of the tower
A trumpet player standing at rest plays a note of frequency 1200 hertz. Determine the speed of the automobile
A .5 kg block rests on a horizontal frictionless surface. It faces toward an inclined surface. How fast is the block going at that max height
An electrician connects two different bulbs in seriesto 120 V circuit. One bulb is rated as 40 W for a nominal voltage 220V, Which of the two bulb is producing more light
A 45kg pole-vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.90m/s. Avoid air resistance and determine her height as she crosses the bar.
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