A room is heated with electric resistance wires embedded in the 2.2 m high ceiling. Estimate the heat transfer per unit of floor area when the ceiling is at 80ºC and the floor is 10ºC. Neglect any radiation and heat transfer between the walls of the room.
What will be an ideal response?
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What is the composite volcano shape?
What will be an ideal response?
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?) rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
A. zero B. 13 mV C. 26 mV D. 20 mV E. 18 mV
What is the relationship between a star's mass and its lifetime?
What will be an ideal response?
Ekapluto is an unknown planet that has two spherical moons in circular orbits. The table summarizes the hypothetical data about the moons. Both moons have low axial spin rates
(G = 6.67 × 10-11 N ? m2/kg2) Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The acceleration due to gravity at the surface of Moon B is A) 0.10 m/s2. B) 0.15 m/s2. C) 0.20 m/s2. D) 0.25 m/s2. E) 0.30 m/s2.