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The amount of water in reservoirs is often measured in acre-ft. One acre-ft is a volume that covers an area of one acre to a depth of one foot. An acre is 43,560 ft2. Find the volume in SI units of
Three equal point charges, each with charge 1.80 μC, are placed at the vertices of an equilateral triangle whose sides are of length 0.250 m. What is the electric potential energy U of the system
what is the velocits of the jogger relative tothe water? later, the jogger is moving toward the stern(rear) of the ship. what is the joggers velocity relative to the water now?
Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 5.2t0.8 - 2.6t + 22, with t = 0, m in grams, and t in seconds. In kilograms per minu
As an example, find the maximum acceleration of a beam that vibrates with an amplitude of 0.37 mm at the rate of 104 vibrations per second. Give your answer as a multiple of g.
Two particles, of charges q1 and q2, are separated by distance d. The net electric field due to the particles is zero at x = d/4. With V=0 at infinity, locate (in terms of d) any point at which the
A particle with a mass of 2.0×10-5 and a charge of +2.3 is released in a (parallel plate) uniform horizontal electric field of 12 . 1) How far horizontally does the particle travel in 0.40 ? 2)
After 43.0 s, the pilot shuts off the RCS thruster. After the RCS thruster is turned off, find the following quantities.(a) the magnitude of the vehicle's velocity
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 24.8 m/s at an angle of 60.5° above t
The cars A and B are moving due east and due north at 60 and 80 km p.h. respectively .At noon A is west of B at a distance 40 km. When are the cars nearest to each other and what is the distance be
You are on a treasure hunt and your map says "Walk due west for 52 paces, then walk 34.8° north of west for 41 paces, and finally walk due north for 25 paces." What is the magnitude of the compo
What would you predict for this elephant's stride frequency? That is, how many steps per minute will the elephant take?
A unit of area, often used in measuring land areas, is the "hectare", defined as 104 m2. An open-pit coal mine consumes 83 hectares of land, down to a depth of 27 m, each year. What volume of earth,
This field extends for 3.5 cm along the electron's path. A) For the scanning electron microscope described above, find the electron's vertical displacement.
Two positive charges of 7.2 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.74. If they are originally far apart and then one charge is slowly moved closer
A 1.40 kg block is attached to a spring with spring constant 18 N/m. While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 46 cm/s. A) W
In a simple model of the hydrogen atom, the electron revolves in a circular orbit around the proton with a speed of 2.2*106 m/s. Determine the radius of the electron's orbit.
Calculate the electric potential due to a dipole whose dipole moment is 4.5×10-30 C*m at a point 1.4×10-9 m away. If this point is 30*above the axis but nearer the positive charge.
A person looking out the window of a stationary train notices that raindrops are falling veritcally down at a speed of 5.0 m/s relative to the ground. When the train moves at a constant velocity, th
Two carpenters are hammering at the same time, each at a different hammering frequency. The hammering frequency is the number of hammer blows per second. Every 3.72 s, both carpenters strike at the
A runner starts from rest and in 3 seconds reaches a speed of 9 m/s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 3 second inte
You've just won the $5 million cash lottery, and you go to pick up the prize. (a) What is the approximate weight of the cash if you request payment in quarters? (Assume a quarter weighs 10-3 kg and
A point charge +6q is located at the origin, and a point charge -3q is located on the x-axis at D = 0.447 m. At what location on the x-axis will a third charge, q0, experience no net force from the
A bowling ball (mass=7.2kg, radius=0.11m) and a billiard ball (mass=0.38kg, radius=0.028m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each
Two sinusoidal waves of the same period, with amplitudes of 4.3 and 7.1 mm, travel in the same direction along a stretched string; they produce a resultant wave with an amplitude of 9.2 mm. The phas