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A common flashlight bulb is rated at 0.300 A and 3.00 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 2.60 ?, what is the temperature of the filament when the bulb is on? The filament is made of tungsten.
Four charged particles are at the corners of a square of side, Determine the total electric force exerted on q
Two point charges 1.6cm apart have an electric potential energy -160?J . The total charge is 25nC. What are the two charges
750kg racecar took 3s to slow from 32m/s to 15m/s. What was the impluse? what was the average force applied to the brakes
A child playing in a swimming pool realizes that it is easy to push a small inflated ball under the surface of the water while a large ball requires a lot of force
make Use of a 9.81 m/s^2 for the magnitude of the acceleration due to gravity.
Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. What is the speed of a satellite in a geosynchronous orbit
A sound wave from a siren has an intensity of 86.2 W/m2 at a certain point, compute the intensity level of the sound wave due to the ambulance
A model rocket is launched straight upward with the initial speed of 70m/s. It accelerates with a constant upward acceleration of 3 m/s2 until its engines stop at an altitude of 180 m.
A 46 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of - 1.2 m/s. Her hands are in contact with the wall for 0.8 s. Ignore friction and wind resistance.
You sled down a hill of 45-m vertical height. The combined mass of you and your sled is 130kg. How much work was doen against friction during your decent
A 310g bird flying along at 6.2m/s sees a 8.0g insect heading straight toward it with a speed of 31m/s, What is the bird's speed immediately after swallowing
In a test explosion, a detonating hydrogen bomb briefly achieves a temperature of 10 million degrees Kelvin
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