Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area (in cm2) of the tires in contact with the ground. the bicycle plus rider has a mass of 89.0 kg, and the gauge pressure in the tires is 4.00 ✕ 105 pa.

If a star is moving toward earth, it is

Use the illustration to describe how the electromagnetic spectrum changes as its frequency moves from radio waves to higher energy gamma waves in terms of wavelength and amplitude.

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?