An object 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has a magnitude of 52 cm. (a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
What will be an ideal response?
(a) 13 cm (b) 1.7 mm
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The Crab Nebula and the Orion Nebula are regions where new stars are being formed
Indicate whether the statement is true or false
The data points in this diagram represent the measured speeds and distances of various galaxies, and the solid line represents a best fit to these data. The trend indicated by the solid line is known as
A) Hubble's law. B) Leavitt's law. C) the inverse square law for light. D) Kepler's third law.
The surface of a protostar radiates energy while its core
A) shrinks and cools. B) shrinks and maintains a constant temperature. C) shrinks and heats. D) expands and cools.
A 1.86-kg block is held in place against the spring by a 81-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring
The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.28. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. The height h of the ramp is closest to A) 11 B) 7.3 C) 15 D) 17 E) 18