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A charge of -3.8 × 10-9 C is at the origin and a charge of 8.1 × 10-9 C is on the x-axis at x = 3 m. At what location on the x-axis is the electric field zero?
Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.90 m/s and moving between the same two points
a thin double convex lens is to focus the image of an object onto a screen so that the image is life sized. how far is the screen from the object
the electron in a hydrogen atom is infintely distant at zero potential energy and is at an average radius of a0=.0529 nm when bound by 13.6 eV. find the nearest principal quantum number in this state
A balloon contains 1.8mol of helium at 1.0atm initially at 180 degree C. How much work does the gas do in the process
A 3.1 kg block slides down a frictionless ramp, as shown in the figure. The top of the ramp is 1.6 m above the ground; What is the speed of the block when it leaves the ramp
A horizontal plank of mass m and length L is pivoted at one end. The plank's other end is supported by a spring of force constant k. The moment of inertia of the plank about the pivot is .
A camera has a telephoto lens of 260-mm focal length. The lens can be moved in and out a distance of 18.5 mm from the film plane by rotating the lens barrel. what is the closest object distance that can be focused
question1 two wires hold up a massive beam of length l16 m and mass 330 kg. a box of mass 220 kg hangs from a wire that
A 17.5 kilogram block is at rest on a frictionless incline that makes an angle of 25.0 degress with respect to the horizontal. What is the magnitude of the horizontal force
A mass m orbits around a planet of mass M in a parabolic orbit of the form y = x^2/(4L), which has focal length L. Find the angular momentum in 3 different ways: a) Find the speed at closet approach.
A driver travels northbound on a highway at a speed of 22.0 m/s. What frequency does the driver detect after the police car passes him
The sun radiates electromagnetic energy at the rate of 3.91×1026 W. What is the change in the sun's mass during one second? Express the answer as a positive mass
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