A book is resting on a table. How many forces would be in the free-body diagram of the book?

a. one
b. two of the same type
c. two of different types
d. three or more of the same type
e. three or more of at least two different types


c

Physics & Space Science

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What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?

A) 12.75 eV B) 10.20 eV C) 3.40 eV D) 0.85 eV

Physics & Space Science

The column of Trajan, erected in Rome in 106-113 A.D., is 125 feet tall. What is its height in centimeters?

A) 1,510 cm B) 591 cm C) 2,520 cm D) 3,810 cm E) 38,100 cm

Physics & Space Science

A brick is resting on a rough incline as shown in the figure. The friction force acting on the brick, along the incline, is

A) zero. B) equal to the weight of the brick. C) greater than the weight of the brick. D) less than the weight of the brick.

Physics & Space Science

Since evaporation of water from reservoirs is an important water loss mechanism, especially in dry climates, it is important to reduce losses. What measures could you suggest for reducing such evaporation? Are any of these actually feasible?

What will be an ideal response?

Physics & Space Science