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A research group plans to construct an engine that extracts energy from the ocean, using the fact that the water temperature near the surface is greater than the temperature in deep water. If the surface water temperature is23.0°C and the deep-water temperature is15.0°C, what is the maximum efficiency such an engine could have?
When two identical ions are separated by a distance of 5.9 10-10 m, the electrostatic force each exerts on the other is 6.0 10-9 N. Evaluate how many electrons are missing from each ion?
A ball is thrown straight up in the air at an initial speed of 30 m/s. find the maximum height of the ball
A charged sphere of radius 10 cm has a total charge of 5 C. Calculate the potential at the surface of the sphere
A 100 m long solenoid has a radius of 0.050 m and 1.5 x 10^4 turns. Determine the self-induced emf in the solenoid due to the changing environment
A thin rod of length 0.84 m and mass 190 g is suspended freely from one end. find how far above that position the center of mass rises
A horizontal spring-mass system has low friction, spring stiffness 155 N/m, and mass 0.6 kg. What is the maximum stretch during the motion
The body contains many small currents caused by the motion of ions in the organs and cells. how large is the current in the heart
An ideal massless spring is hanging vertically. When an unknown mass is attached to the spring, What is the frequency of the resulting oscillation
A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10-8 ? ? m. at what rate is heat generated in the rod
A lamp (R = 146 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 122 V line. What is the voltage across the fan
q1. two balls of masses 43kg and 65kg are suspended. the lighter ball is pulled away to a 66 angle with the vertical
Alpha-particle scattering experiments using uranium (Z = 92) as the target material show that the alpha-particles experience a pure Coulomb repulsion, Estimate the radius of the uranium nucleus
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