Is mechanical advantage always greater than one?

roller coaster has a mass of 425 kg. It sits at the top of a hill with height of 66 m. How fast is it going when it reaches the bottom?

What is your interpretation of 'nothing'? (Talking astrophysics) More answers the better!

The clownfish is classified as an omnivore because it eats

Which of the following are modified inclined planes? Answer pulley and wedge lever and screw gear and wedge wedge and screw

The difference in emf between the primary coil of a transformer and the secondary coil is directly related to the relative number of turns in the coils. True or False?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction