A flea jumps by exerting a force of 1.20 × 10−5 N straight down on the ground. A breezeblowing on the flea parallel to the ground exerts a force of 0.500 × 10−6 N on the flea whilethe flea is still in contact with the ground. Find the direction and magnitude of theacceleration of the flea if its mass is 6.00 × 10−7 kg . Do not neglect the gravitational force.

In a closed system, the total energy prior to an energy transformation is the total energy after. a. equal to b. unrelated to c. greater than d. less than

How much work would a child do while puling a 12-kg wagon a distance of 3m with a 22 n force directed 30 degrees with respect to the horizontal? (a) 82j (b) 52j (c) 109j (d) 95j

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?