Velocity: 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. How long does it take for them to meet?

Fill in the blank(s) with the appropriate word(s).


20 seconds

Physics & Space Science

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A Styrofoam spherical container having a 1 inch thick wall and 2 foot diameter holds dry ice (solid carbon dioxide) at -85ºF. If the outside temperature is 60ºF, estimate the heat gain in the container and establish the temperature distribution through the 1 inch wall.

What will be an ideal response?

Physics & Space Science

One target of the UN Millennium Development Goals that has successfully been reached involved cutting in half the number of people who lack access to

a. public education. b. information technology. c. international trade. d. safe drinking water.

Physics & Space Science

When visible light is incident upon clear glass, atoms in the glass

A) are forced into vibration. B) resonate. C) convert the light energy into internal energy.

Physics & Space Science

As it orbits the Earth, the Moon appears to move its own diameter (0.5 degrees) eastward every hour against the background stars

Indicate whether the statement is true or false

Physics & Space Science