This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?

A) hot gas expanding outward from the site of a supernova
B) cold gas that will soon give birth to new stars
C) accretion disk around a black hole near the center of the supernova remnant
D) spots within the remnant where hot gas is crashing into and destroying planets


A) hot gas expanding outward from the site of a supernova

Physics & Space Science

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Dielectrics: The square plates of a 5000-pF parallel-plate capacitor measure 50 mm by 50 mm and are separated by a dielectric that is 0.23 mm thick and totally fills the region between the plates. The voltage rating (the maximum safe voltage) of the capacitor is 400 V. What is the maximum energy that can be stored in this capacitor without damaging it? (?0 = 8.85 × 10-12 C2/N ? m2)

A. 0.40 mJ B. 0.50 mJ C. 0.60 mJ D. 0.70 mJ E. 0.80 mJ

Physics & Space Science

During a nuclear reaction, 1.7 × 10-4 J of energy is released. What is the resulting change in mass of the particles involved? (c = 3.00 × 108 m/s)

A) 5.1 × 10-4 kg B) 4.3 × 10-11 kg C) 1.5 × 10-13 kg D) 4.8 × 10-18 kg E) 1.9 × 10-21 kg

Physics & Space Science

A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?

a. 0 b. 15 c. 29 d. 63 e. 250

Physics & Space Science

What two modes of heat transfer predominate during film boiling?

What will be an ideal response?

Physics & Space Science