Asled is moving down a steep hill. the mass of the sled is 50 kg and the net force acting on it is 20 n. what must be
done to find the acceleration of the sled? check all that apply.
the force of gravity must be broken into its parallel and perpendicular components.
acceleration can be found by dividing the net force by mass.
acceleration can be found by multiplying the net force by mass.
the magnitude of the force components must be multiplied by gravity.
trigonometry can be used to solve for the magnitude of the force components.
net force must be found before acceleration can be found.

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

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Which component of the earth’s atmosphere is decreased due to photosynthesis?