A sensor made of a conducting sphere of 1m in diameter is placed at a distance of
L=2 × 10^8 km from a star of radius R=6 × 10^5 km. The recorded temperature on the sensor is 300K. What is the surface temperature of the star?

An astronomer at the equator measures the doppler shift of sunlight at sunset. from this, she calculates that earth’s tangential velocity at the equator is 465 m/s. the centripetal acceleration at the equator is 3.41  10 2 m/s 2 . use this data to calculate earth’s radius.

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.