Astreet light is mounted at the top of a 15-ft-tall pole. a man 6 ft tall walks away from the pole with a speed of 5 ft/s along a straight path. how fast is the tip of his shadow moving when he is 40 ft from the pole? (a) what quantities are given in the problem? (b) what is the unknown? (c) draw a picture of the situation for any time t. (d) write an equation that relates the quantities. (e) finish solving the problem.

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Which best term to describe a chemical reaction that absorbs energy from its surroundings? a. thermal conductor b. thermal insulator c. endothermic d. exothermic