Which of the following observations would not be likely to provide information about the final, explosive stages of a star's life?
A) decades of continuous monitoring of red giants in a globular cluster
B) studying the light rings around Supernova 1987A in the Large Magellanic Cloud
C) observing the structures of planetary nebulae
D) neutrino detections from nearby supernovae
A) decades of continuous monitoring of red giants in a globular cluster
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Alternating current and voltage (AC), rather than direct current and voltage (DC), are used for domestic electrical power. The reason for this is based on one of the following physical principles. Which one?
A) When a current flows through a resistance, heat is generated. B) When a current flows through a wire, a magnetic field is created. C) When the number of magnetic field lines passing through a circuit changes, a voltage is generated in the circuit. D) When a current-carrying wire is placed in a magnetic field, it may experience a force if properly oriented. E) Opposite electric charges attract each other, and like charges repel each other.
A piece of glass that appears red
A) absorbs or reflects all colors except red. B) transmits red. C) both of these D) neither of these
Power: When 5.00 A is flowing through an 10.0-? device, how much power is being dissipated in the device?
A. 50.0 W B. 250 W C. 500 W D. 2.50 kW
Starting from rest, a 2 kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is
a. 2 N b. 4 N c. 8 N d. 16 N e. 6 N