A red horse and a black horse raced on a 1-mile long circular racetrack. The red horse completed the race in 120 seconds, and the black horse completed the race in 150
seconds. Which choice correctly describes the speed of the horses?
A- Only the red horse ran at a constant speed
B- The red horse's average speed was greater than the black horse's average speed.
C- The black horse's average speed was greater than the red horse's average speed.
D- Only the black horse ran at a constant speed.

In a good thermo flask the main cause of heat loss is

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?