The surface temperature of our sun is 5800 K, and the peak of its intensity curve is in the middle of the visible spectrum. A star that appears violet in color could have a surface temperature of:

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2