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

Physics & Space Science

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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

Physics & Space Science

In any natural process, some energy becomes unavailable to do useful work

Indicate whether the statement is true or false

Physics & Space Science

Heat is transferred through solids primarily by the process of

a) convection. b) conduction. c) condensation. d) radiation.

Physics & Space Science

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

Physics & Space Science