Please help!! What is the change in the internal energy if 90 J of thermal energy is added to a system, and the system does 30 J of work on the surroundings? A. -130 J B. 130 J C. 60 J D. -60 J

The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. this simple process iswhich kind of a change? a.a physical changeb. a chemical changec. a nuclear changed. an ionic change

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

Write a polynomial function with the given zeros x= -1,0,2show your work