In most four-sroke internal combustion engines, when does the piston move downward?

What's the relationship between the starting height of a ball and the height of its first bounce?

What is the difference between multiple and sub multiple units?

It takes one kilogram of metal to make a certain solid cube. What mass of metal is needed to make a cube of the same metal whose edges are twice as long as the first? Explain your answer.

Why doesn't the Leaning Tower of Pisa fall over?

Find the distance traveled in 20 seconds by an object traveling at a constant velocity of 28 feet per second.

A student conducts and investigation to determine a ball's mass, displacement, velocity and acceleration. (A) Identify each of the following as wither a vector or scalar quantity: Mass, Displacement, Velocity & Acceleration.

A ball is rolling down a hill at + 1.0 m/s, The ball is uniformly accelerating at +4.9 m/s?, What will the ball's velocity be 4.0 s later? +8.9 x 100° m/s +2.0 x 10^1 m/s +2.1 x 10^1 m/s -1.9 x 10^1 m/s

What is the difference between unicellular and multicellular organisms?

Is momentum conserved in the collision?

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?