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In one cycle, a heat engine does 380 J of work and releases 700 J of heat to a lower-temperature reservoir.
What is the efficiency of the engine?
The left face of a bioconvex lens has a radius of curvature of 10.3 cm, and the right face has a radius of curvature of 15 cm. Calculate the focal length of the lens
A monkey in a perch 20m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5m/s beneath the tree. How far behind him in metres does the coconut hit the ground?
Two particles are fixed to an x axis: particle 1 ofcharge -7.52 x 10-7 C is at the origin and particle 2 ofcharge +7.52 x 10-7 C is at x = 16.6 cm. Midwaybetween the particles, what is the magnitude of the net electricfield?
Two 1.8 V. batteries are connected together in series to a bulb whose resistance is 50 ohms. How many electrons leave each battery per minute
two long parallel wires each carry a current of 5.0 a directed to the east. the two wires are separated by 8.0 cm. what
It is found experimentally that the electric field in a certainregion of Earth's atmosphere is directed vertically down. At analtitude of 260 m the field hasmagnitude 60.0 N/C. At an altitude of 190 m, the magnitude is 100 N/C.
If gravitational forces alone prevent a spherical, rotating neutron star from disintegrating. Evaluate the minimum mean density of a star that has a rotation period of one millisecond
An unknown element is found to have an absorption spectrum with lines at 3.0, 7.0, and 9.0eV, and its ionization energy is 10.0eV. If a 9.0eV photon is absorbed, what energies can the subsequently emitted photons have?
The Moon rotates once on its axis in 27.3 days. Its radius is 1.74 x 10 to the 6th m. What is the linear speed of a rock on the Moon's equator due only to the Moon's rotation
At what angle should the road bank on the curve so that no frictional force is required by a vehicle travelling around the curve at the speed limit.
A parallel-plate air-filled capacitor having area 41.0 cm2 and plate spacing 2.70 mm is charged to a potential difference of 360. V. calculate the energy density between the plates
Draw a ray diagram to approximately determine the location of the image. Now, use the thin-lens equation to determine the location and height of the image.
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