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A convex lens is held over a piece of paper outdoors on asunny day. When the paper is held 26 {\rm cm} below the lens, the sunlight is focused on the paper and the paperignites. What is the focal length of the lens?
The earth's magnetic field, with a magnetic dipole moment of 8.0×1022A?m2 , is generated by currents within the molten iron of the earth's outer core. What is the current in the current loop
We are not normally aware of the gravitational or electric force between two ordinary objects. What is the reason in each case? Give an example where we are aware of each one and why.
two equal-volume compartments of a box are joined by a thin wall as shown in the figure. the left compartment is filled
A parallel-plate capacitor has square plates of edge length1.9 cm and a plate spacing of0.030 mm. If the gap between the plates is a vacuum, what is the capacitance?
Consider a car undergoing these two displacements: D1 (3 km, 4 km) and D2 (4km, -3 km). how far will the car then be from its starting point
A weight is attached to one end of a lightweight spring held at other end. When the weight comes to rest, the spring is stretched 20 cm beyond its natural length. In another condition the weight is completely immersed in water.
A convex lens with f1= 20.3cm is mounted 39.5cm to the left of a concave lens. When an object is placed 29.4cm to the left of the convex lens, What is the focal length f2 of the concave lens
a 0.30 kg ball is tied to a 38 cm long string and released from a horizontal position. it swings down colliding with a
A small object begins a free-fall from a height of H = 87.0 m at t0 = 0 s. After %u03C4 = 2.20 s, At what height from the ground will the two objects first meet
a thin slab of charge length l width w and surface charge density sigma lies along the x-y plane. supose you want to
A rectangular block of wood (M = 219 kg) floats on a calm fresh water lake with do = 22.7 cm below the water. Find the mass of the dog
the starting current in a dc motor is 20 a but it normally operates on 110 volts with a back emf of 90 volts. what is
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