A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. An observer waiting at the crossing receives a frequency of 207 Hz. What is the speed of the train?

8. A boy pulls a 20.0-kg box with a 140-N force at 30° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.25 and the box is pulled a distance of 28.

How far can a person run in 15 minutes if he or she runs a at an average speed of 16 km/hr? what is the runners distance traveled in miles

The approximate speed of a man is

Which of the following is not a way in which humans directly impact algal bloom production? a. industrial pollution b. wastewater discharge c. fertilizer in aquatic ecosystems d. fishing

7. A truck traveling west on the highway experiences an acceleration to the east. What could be the cause of this acceleration?

If you suspect your culture of bacteria has 25 x 107 cells per mL, what would you want the final dilution to be in order to end up with 100 cfu on a plate?

What are transverse waves and longitudinal waves have? how are they similar and different?

The primary neurotransmitter at the neuromuscular junction is

Which is the correct equation for calculating the kinetic energy of an object? COM 1 1 KE = mgh KE = mu? KE = at KE = 492 O ) Intro ✓ Done DO

What is a wave? In other words, what is the physical science term for a wave?