A rod, with sides insulated to prevent heat loss, has one end immersed in boiling water 100°C and the other end in a water-ice mixture at 0.00°C
The rod has uniform cross-sectional area of and length of Under steady state conditions, the heat conducted by the rod melts the ice at a rate of every 34 seconds. What is the thermal conductivity of the rod? (The heat of fusion of water is
What will be an ideal response?
Answer: 220 W/m ? K
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The second postulate of special relativity states that ____
a. observers cannot detect their uniform motion except relative to other objects b. observers cannot distinguish locally between inertial forces and uniform gravitational forces due to acceleration and the presence of a massive body c. the laws of physics are the same for all observers regardless of their motion as long as their speed is constant d. the speed of light is constant and will be the same for all observers independent of their motion relative to the light source e. the acceleration of an object is proportional to the applied force and inversely proportional to its mass
A capacitor, initially charged, and an inductor form an LC circuit. When the electric current in the circuit is equal to zero how much energy is stored on each device?
A) Inductor: zero energy. Capacitor: zero energy B) Inductor: Half of the maximum energy. Capacitor: Half of the maximum energy C) Inductor: maximum energy. Capacitor: zero energy D) Inductor: zero energy. Capacitor: maximum energy E) Inductor: maximum energy. Capacitor: maximum energy
The highest energy level in an atom corresponds to n = _________
Fill in the blank(s) with correct word
Which explanation best describes why Earth observers always see the same face of the moon?
A) The Moon's rate of spin matches the rate at which the Moon revolves around Earth. B) The Moon does not rotate as it circles Earth. C) We tend only to observe the Moon at night, not during the day. D) Earth and Moon are partially gravity locked.