A braking system loses 25% of its energy consumed in useful energy. What is its energy efficiency?

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

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