What is the braking force needed to bring a 15kg car going 35 m/s to a complete stop in 5s?

What elements make up most of the mantle?

A weight suspended from a spring is seen to bob up and down over a distance of 39 cm twice each second. what is its frequency? answer in units of hz.

Which of the following numbers most closely represents the number of galaxies in the universe? A) hundreds B) thousands C) millions D) billions

A 50 kg woman and an 80 kg man stand 12.0 m apart on frictionless ice. (a) How far from the woman is their CM? m (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 1.

When a baseball is thrown straight upwards, the balls velocity at its maximum height is

A locomotive is pulling 16 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.

What is the special feature of the upper mantle?

What is the difference between weight and mass? mass and weight are both intrinsic properties of an object. if you multiply the mass of an object by the acceleration due to gravity, you will obtain the object's weight.

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. the skipper estimates the distance between crests is 15 m. what is the speed of the water waves?

According to this lesson, how many major ice ages has the earth undergone? A. 2 B. 3 C. 4 D. 5