Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them
By the time Arthur and Betty meet, what is Spot's displacement?
60 m in the direction of Betty
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Shield volcanoes, like those on Venus and Mars, occur ____
a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera
Resistance and Resistivity: When a potential difference is applied across a piece of wire made of metal A, a 5.0-mA current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10-8 ? ? m, and the resistivity of metal B is 1.59 × 10-8 ? ? m.
A. 21 mA B. 19 mA C. 11 mA D. 5.3 mA
Heat is transferred through solids primarily by the process of
a) convection. b) conduction. c) condensation. d) radiation.
In any natural process, some energy becomes unavailable to do useful work
Indicate whether the statement is true or false