The two types of bright nebulae are emission nebulae and ______________ nebulae
Fill in the blank(s) with correct word
reflection
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State Kirchhoff's junction theorem
What will be an ideal response?
A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?
a. It has increased by 20 J. b. It has decreased by 200 J. c. It has decreased by 20 J. d. It has increased by 200 J.
A airplane that is flying level needs to accelerate from a speed of 2.00 × 102 m/s to a speed of 2.40 × 102 m/s while it flies a distance of 1.20 km. What must be the acceleration of the plane?
A) 4.44 m/s2 B) 2.45 m/s2 C) 7.33 m/s2 D) 5.78 m/s2 E) 1.34 m/s2
A sphere is constructed of two concentric pieces. The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3. The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm
The outer shell has a density 9000 kg/m3. (a) What is the mass of this sphere? (b) What is the average density of this sphere?