En una obra el ingeniero les pide a sus trabajadores que tienen que mover una piedra que pesa 1000 kg para lo cual 8 trabajadores comienzan a ejercer fuerza en la misma los datos son los siguientes 2 de ellos aplican una fuerza de 140 N a 200 grados, 2 trabajadores más ejercen lo doble de fuerza que los primeros pero a 45 grados y 3 trabajadores más ejercen lo triple de fuerza que los primeros dos trabajadores en un ángulo de 60 grados y el último trabajador ejerce una fuerza de 45 N en un ángulo de 200 grados. Dibuja el proceso del problema y calcula la fuerza resultante.

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.