A certain comet of mass 3 × 1015 kg at its closest approach to the Sun is observed to be at a distance 5.8 × 1011 m from the center of the Sun, moving with speed 23000 m/s. At a later time the comet is observed to be at a distance 40.9 × 1011 m from the center of the Sun, and the angle between and the velocity vector is measured to be 10.33°. What is ?

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

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

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.