What happens when the spaceship in the animation has zero horizontal velocity?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.