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A small metal ball with a mass of 5.3 g and a charge of 6.3 mC is located at a distance of 0.70 m above the ground in an electric field of 14 N/C directed to the east. The ball is then released from rest. What is the velocity of the ball after it has moved downward a vertical distance of 0.30 m? (Assume that the +x direction is east, the +y direction is north, and the +z direction is upward.)
Two loudspeaker, 4.0 m apart and facing each other, play identical sounds of the same frequency. You stand halfway between them, where there is a max. of sound intensity. moving from this point toward one of the speakers, you encounter a min. of s..
A 1500 W radiant heater os ocnstructed to operate at 110V. How much thermal energy is produced in 1 hour by the heater
One of the instruments on the probe has a spring (with a weight of 1.0 kg at one end) that measures the intensity of the gravitational force of the asteroid. What would be its maximum "bobbing" velocity if it were on Earth
Light from a helium-neon laser (?=633nm) is used to illuminate two narrow slits. What is the spacing (in mm) between the slits
A 60 kg boy and a 40 kg girl both wearing skates face eachother at rest on a frictionless ice surface. what is the resulting speed and direction of the boy
A horizontal board weighing 198 N is supported at points A and B. The plank serves as a platform for a painter, who weighs 558.5 N. Find out the maximum distance D, such that the plank would not tip, no matter where the painter stands.
A child sits in a wagon with a pile of 0.403 kg rocks. If she canthrow each rock with a speed of 11.7 m/s relative to the ground, how many rocks must she throw
The inner radius of a bone is half the outer radius. What would the outer radius of the bone be if, for a given torque, it were to twist through the same angle as a steel rod of the same length with a 1-cm radius? (the polar moment of inertia of a ho..
You are on a cruise ship traveling north at a speed of 13.0 m/s with respect to land. If you walk north toward the front of the ship, with a speed of 2.7 with respect to the ship, what is your velocity with respect to the land
The alveoli have an average radius of 0.117 mm and are approximately spherical. If the pressure in the sacs is 5.00 105 Pa, how many air molecules are in an alveolus
An object of mass m = 3.1 g and charge q = +48 μc is attached to a string and placed in a uniform electric field that is inclined at an angle of 30 degrees with the horizontal. The object is in static equilibrium when the string is horizontal.
A 19.00kg lead sphere is hanging from a hook by a thin wire 3.40m long, and is free to swing in a complete circle. What must be the minimum initial speed of the dart
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