A car covers first half of the distance between two places at a speed of 40 km/h and the second half at 60 km/h. What is the average speed of the car?

Two cyclists who weigh the same and have identical bicycles ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob.

Momentum is closely related to

Which statement best describes how light waves travel in a uniform medium? A. in straight lines B. in extending circles C. in bent lines D. in shrinking ripples

A DC generator is similar to an AC generator except that in A. DC generators, slip rings produce direct current. B. DC generators, commutators produce direct current. C. AC generators, commutators produce alternating current. D.

How was Edwin Hubble able to use his discovery of Cepheids in Andromeda to prove that the "spiral nebulae" were actually galaxies external to the Milky Way?

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.