Paheli observed the shadow of a tree at 8: 00 a. m., 12: 00 noon and 3: 00 p. m. which of the following statements is closest to her observation about the shape and size of the shadow? (a) the shape of the shadow of the tree changes but the size remains the same. (b) the size of the shadow of the tree changes but the shape remains the same. (c) both the size and shape of the shadow of the tree change. (d) neither the shape nor the size of the shadow changes.

The heliocentric and the geocentric models of the solar system included these central principles

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.