Magnetars The astronomical object 4U014 + 61 has the distinction of creating the most powerful magnetic field ever observed. This object is referred to as a “magnetar” (a subclass of pulsars), and its magnetic field is 1.3 × 10 15 times greater than the Earth’s magnetic field. (a) Suppose a 2.5-m straight wire carrying a current of 1.1 A is placed in this magnetic field at an angle of 65° to the field lines. What force does this wire experience? (b) A field this strong can significantly change the behavior of an atom. To see this, consider an electron moving with a speed of 2.2 × 10 6 m/s. Compare the maximum magnetic force exerted on the electron to the electric force a proton exerts on an electron in a hydrogen atom. The radius of the hydrogen atom is 5.29 × 10 −11 m.
Magnetars The astronomical object 4U014 + 61 has the distinction of creating the most powerful magnetic field ever observed. This object is referred to as a “magnetar” (a subclass of pulsars), and its magnetic field is 1.3 × 10 15 times greater than the Earth’s magnetic field. (a) Suppose a 2.5-m straight wire carrying a current of 1.1 A is placed in this magnetic field at an angle of 65° to the field lines. What force does this wire experience? (b) A field this strong can significantly change the behavior of an atom. To see this, consider an electron moving with a speed of 2.2 × 10 6 m/s. Compare the maximum magnetic force exerted on the electron to the electric force a proton exerts on an electron in a hydrogen atom. The radius of the hydrogen atom is 5.29 × 10 −11 m.
Magnetars The astronomical object 4U014 + 61 has the distinction of creating the most powerful magnetic field ever observed. This object is referred to as a “magnetar” (a subclass of pulsars), and its magnetic field is 1.3 × 1015 times greater than the Earth’s magnetic field. (a) Suppose a 2.5-m straight wire carrying a current of 1.1 A is placed in this magnetic field at an angle of 65° to the field lines. What force does this wire experience? (b) A field this strong can significantly change the behavior of an atom. To see this, consider an electron moving with a speed of 2.2 × 106 m/s. Compare the maximum magnetic force exerted on the electron to the electric force a proton exerts on an electron in a hydrogen atom. The radius of the hydrogen atom is 5.29 × 10−11 m.
A certain brand of freezer is advertised to use 730 kW h of energy per year.
Part A
Assuming the freezer operates for 5 hours each day, how much power does it require while operating?
Express your answer in watts.
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?
P
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Part B
W
If the freezer keeps its interior at a temperature of -6.0° C in a 20.0° C room, what is its theoretical maximum
performance coefficient?
Enter your answer numerically.
K =
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Part C
What is the theoretical maximum amount of ice this freezer could make in an hour, starting with water at 20.0°C?
Express your answer in kilograms.
m =
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kg
Describe the development of rational choice theory in sociology.
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