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A parallel-plate capacitor is formed from two 2.20 cm multiplied by 2.20 cm electrodes spaced 2.0 mm apart. What is the charge (in nC) on each electrode
A solid disk is rotating about an axis with uniform angular velocity. another disk, with the same moment of intertia about the rotation axis, how is the new angular velocity related to the old one
A 24-kg boy stands 1 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 218 kg m2. Calculate the speed of the boy relative to the surface of the merry-go-r
A -6.0 diopter lens is held 10.0 cm from an ant that is 1.0mm high. What is the height of the image
An object of mass 10 kg is initially at rest. What is the change in the kinetic energy of this object
Jamie pulls a box of 1.0 kg mass up an inclined plane by a constant force of 10 N that causes a displacement of 0.50 m. find the work done by the normal force on the object
Dan lifts a mass of 10 kg vertically upward at a constant speed of 0.2 m/s through a distance of 1 m. What is the work done by Dan
A car moving at 10.0 m/s encounters a bump that has a circular cross-section with a radius of 30.0 m. when the car is at the top of the bump
A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. What is the minimum uncertainty in the duck's speed
Suppose a star with radius 8.39 multiply.gif 108 m has a peak wavelength of 686 nm in the spectrum of its emitted radiation. What is the surface temperature of the star
An astronaut can barely resolve two objects on the earth's surface, 230 km below. What is the minimum distance smin that separates the two objects
If we want to have successive fringes on a screen 5.9 cm apart near the center of the pattern, where should we place the screen
A 0.954-kg toy car is powered by three D cells (4.50 V total) connected directly to a small DC motor. What is the average current supplied to the car\'s motor
A large gear is made by starting with a solid metal disk of mass 5 kg and radius 25 cm. Determine the moment of inertia for the gear spinning
When the eye looks at a star (a point of light), diffraction at the pupil spreads the image of the start on the retina into a small disk, What is the linear size of the image of the start on the reti
Rumor has it that a photographic camera on a spy satellite can read the license plate of an automobile on the ground. what must be the diameter of the aperture of the camera
A small camera has a lens with focal length f=15 mm has a movable lens that can be focused on objects as close as 20 cm or as far away as infinity (relative to f). What is the optimum lens-film dist
A movie camera has a converging lens with a focal length of 80.0 mm. What is the height of the image on the film
A candle of height 2.0 cm is placed 10.0 cm in front of a diverging (concave) lens of focal length -6.0 cm. Where is the image of the candle
Suppose you hold a f=5.0 cm magnifying glass 3.0 cm from a 2.0 mm high ant. how large is the image of the ant
A camera has a f=50 mm (f=5 cm) lens. A 1.0 mm (0.1cm) tall ant is 200 mm (20 cm) from the lens. Where should the film be placed
A jewelry maker has asked your glass studio to produce a sheet of dichroic glass that will appear red for transmitted light, how thick should the coating be
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.0 multiply.gif 104 rev/min. Determine the angle (in radians) through which the drill rotates