A1000 kg car moves as speed from 10 m/s to 30 m/s in 20 seconds. what is the average speed ? what is the acceleration ? what is the average force acting upon it ? if the car turns along a circle at speed 5 m/s around a curve 30 meters in radius , how big the centripetal force is needed ?

What is the most useful equation for electric power?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm