If a car travels 30 miles in 5 hours, how many miles per hour is the car traveling? ((Please help I need this question in no less than 20 minutes!!!))

How many molecules are present in 3 mols of silicon dioxide (sio2)?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity