Two carts, cart X and cart Y , are initially at rest and placed next to each other on a horizontal track, as shown in Figure 1. A switch on top of cart Y can be pressed so that a compressed spring inside of the cart expands and pushes a plunger outward, causing the two carts to recoil, as shown in Figure 2. Both carts have identical but unknown masses, M . The carts are designed so that bars of additional but unknown mass can be added and secured to the carts. A group of students are asked to determine the relationship of the momentum of the cart X –bar system to the momentum of the cart Y –bar system immediately after recoil. The students have access to equipment that can be found in a typical school physics laboratory.

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

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