In a circuit made up of inductor L, resistance R, ammeter, battery and switch in series, the current is greatest at which of the following times, as measured after the switch is closed?
a. zero
b. one time constant
c. at a time t = L/R
d. ten time constants
d
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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.6 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.2 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is given up by 2.80 kg of this substance when it is cooled from 170°C to 86°C at a pressure of one atmosphere?
A. 400 kJ B. 200 kJ C. 300 kJ D. 440 kJ E. 640 kJ
A gravitational wave can carry energy away from two very dense objects if they are orbiting each other or collide.
Answer the following statement true (T) or false (F)
Although sunspots are cooler areas in the photosphere, when they increase in number that tells us the Sun is becoming more active
Indicate whether the statement is true or false
In typical globular clusters, the brightest stars are ________
Fill in the blank(s) with correct word