A 4.0-cm tall object is placed 60 cm in front of a convex lens of focal length of magnitude 30 cm. What are the nature and location of the image?
A) The image is real, 2.5 cm tall, 30 cm on the same side as object.
B) The image is virtual, 2.5 cm tall, 30 cm on the other side of the lens.
C) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens.
D) The image is virtual, 4.0 cm tall, 60 cm on the same side as object.
E) The image is real, 4.0 cm tall, 60 cm on the other side of the lens.
E
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The external expression of a mineral's orderly internal arrangement of atoms is referred to as:
its specific gravity. its hardness. its streak. its crystal form. its luster.
At an instant when a particle of mass 50 g has an acceleration of 80 m/s2 in the positive x direction, a 75-g particle has an acceleration of 40 m/s2 in the positive y direction. What is the magnitude of the acceleration of the center of mass of this two-particle system at this instant?
a. 60 m/s2 b. 56 m/s2 c. 40 m/s2 d. 50 m/s2 e. 46 m/s2
An atom of helium can store energy by bumping an electron from its lowest orbital energy state to a higher orbital energy level. In particular, moving an electron from the lowest state to the next-lowest state would store an energy of 24.6 eV. Why can we ignore this energy storage mode when calculating the heat capacity of helium gas?
A. This mode is “frozen” out at normal temperatures. B. Collisions between atoms can’t influence the energy levels of electrons inside the atoms. C. This storage mode is completely independent of the kinetic and/or rotational energy modes. D. Only modes involving helium molecules count. E. We have ignored this mode only for simplicity’s sake. F. Some other reason (specify).
The Earth reversed its magnetic field about how many years ago?
A) 700 B) 700,000 C) 11 D) 7000 E) 70,000,000