Aperson carries a wood plank of l = 2.6 m long with one hand pushing down on it at one end with a force f1 and the other hand holding it up at d = 0.40 m from the end of the plank with force f2. if the plank has a mass of 21.0 kg and its center of gravity is at the middle of the plank, what are the forces f1 and f2? apply the first condition of equilibrium: net force = 0, to obtain first equation. apply the second condition of equilibrium: net torque = 0, to obtain second equation. (notice: you choose an axis of rotation and mark it on the drawing. the lever arm for each force is from your chosen axis of rotation.) force 1 magnitude (in newtons) is enter a number n (5 attempts remaining)input 1 status force 2 magnitude (in newtons) is

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow

Use the library or internet to research each planet. make a chart comparing the following: approximate surface temperature relative surface gravity compared to earth atmospheric gases water in any form: solid, gas, or liquid when you have completed your chart, use the information you have collected to answer the following questions: which is the hottest planet? which is the coldest planet? which planet's temperature is closest to that of earth? (note: water boils at 100°c/212°f. water freezes at 0°c/32°f) which planet has the greatest gravitational attraction? which planet has the least gravitational attraction? which planet's gravitational pull is closest to that of earth? do any of the planets have oxygen in their atmosphere? which planet's atmosphere most resembles that of earth? do any of the planets have flowing water? which planet's water resources (solid, gas, or liquid) might be close to the amount on earth? which planet most resembles earth in terms of all of the factors: temperature, gravity, atmosphere, and water? if earth became an uninhabitable planet, which planet do you think would be the next best to live on? explain your answer.