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A positive charge of 0.900? C is located in a uniform field of 1.05×105 N/C. A negative charge of -0.400? C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge due to the field. How close are the two charges?
The intensity (in W/m2) of one sound is 5.46 times as great as the intensity of another sound. what is the intensity level of the louder sound
What is the force acting on the electron (magnitude and direction) ? What is the electric field (magnitude and direction ) at the point where the electron is located
A person runs with speed v toward a tunnel of length L, When the person and the photon eventually meet, the person's location is a fraction f along the tunnel. What is f
Two loudspeakers face each other, vibrate in phase and produce identical 416 Hz tones. A listener walks from one speaker toward the other at the constant speed and hears the loudness change.
A student makes a simple ac generator by using a single square wire loop 15cm on a side. The loop is then rotated at a frequency of 60 Hz in a magnetic field of 1.8×10?2T, What is the maximum emf output
Use the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years.
Consider a particle with positive charge q = 8.00 * 10^18 C moves with velocity v=(4i + 2j - k) m/s through a region, calculate the total force on the moving particle
A kid is outside his home playing with a metal hoop and stick. If the hoop starts from rest at the top of the hill and reaches a linear speed of 9.50 m/s in 11.5 s, what is the angular acceleration of the hoop
A major-league catcher gloves a 85 mi/h pitch and brings it to rest in 0.17m. If the force exerted by the catcher is 803 N, what is the mass of the ball.
A 4.40 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 40.0 N. it gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of its vertical axis is set by..
An open-pit coal mine consumes 96 hectares of land, down to the depth of 26 m, each year. What volume of earth, in cubic kilometres, is removed in this time.
Calculate the probability of finding the electron in the ground state of hydrogen at less than one Bohr radius from the nucleus
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