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a person with a near-point distance of 32 cm is able to get a usable magnification of 12 with a particular magnifying
light is emited from an ordinary lightbulb filament in wave-train bursts about 10-8s in duration what is the length in
a very long straight solenoid with a cross-sectional area of 600 is wound with 400 turns of wire per centimeter and the
a stainless steel orthodontic wire is applied to a tooth as shown in the figure above the wire has an unstretched
a group of swimmers is resting in the sun on an off-shore raft they estimate that 344 m separate a trough and an
a 260-n metal bar 150 m long and having a resistance of 100 ohms rests horizontally on conducting wires connecting it
a laser beam is incident on a 45deg-45deg-90deg prism perpendicular to one of its faces as shown in the figure below
a balloon is filled with helium at a pressure of 24 x 105 pa the balloon is at a temperature of 18 degrees c and has a
an electric eel delivers a current of 085a to a small pencil-thin prey 15cm longif the eels bio-battery was charged to
a battery delivers 254a to a resistor rated at 460 when it is connected to a 215 resistor it delivers 498a a determine
a 120-v motor has mechanical power output of 250 hp it is 90 efficient in converting power that it takes in by
a luminous object is 340m from a wall you are to use a concave mirror to project an image of the object on the wall
a rectangular block of glass n 152 surrounded by a liquid with n 170 a ray of light is incident on the glass at point
you are standing at rest with respect to the earth holding a lance which you measure as 10 meters long and a knight
a mass of 05 kg is attached to the end of a massless spring of spring constant 075 nm it is released from rest from an
when a quarterback throws a quick pass he pushes on the ball with constant horizontal force for 010 sec while his hand
a boy pulls a 50 kg sled 100 m along a horizontal surface at a constant speed the coefficient of kinetic friction is
a railroad engine weighs three times as much as a freight car if the engine coasts at 9 km per hour into a freight car
a bug that has a mass mb 3 g walks from the center to the edge of a disk that is freely turning at 20 rpm the disk has
a hollow thin-shelled ball of mass m rolls along a horizontal surface with a translational speed of v what percent of
a current loop carrying a current of 40 a is in the shape of a right triangle with sides 30 40 and 50 cm the loop is in
a concave mirror is to form an image of the filament of a headlight lamp on a screen 800m from the mirror the filament
an ice skater has a moment of inertia of 25 kgm2 when his arms are outstretched and a moment of inertia of 10 kgm2 when
a parallel-plate capacitor in air has a plate separation of 150 cm and area of 250 cm2 the plates are charged to a
an object 0680cm tall is placed 185cm to the left of the vertex of a convex spherical mirror having a radius of