An endothermic reaction will start when the required ΔH energy is received from the environment or solution. True or False.

Is it possible to get a bruise inside your body?

The weight of a body of certain mass become zero in space. why?

Carmen simplifies the expression (4y+8x+6) + 25 + (4x+6y+7). The coefficient of the variable y in her simplified answer is

A 50-kg bicyclist coasts up a hill. What is the cyclist change in kinetic energy as her altitude changes from 15m to 20m? A) 0 joules B) approximately 2,500 joules C) approximately 7.500 joules D) approximately 10.000 joules

What is true if mass is conserved in a reaction

A 535 kg roller coaster car began at rest at the top of a 93.0 m hill. Now it is at the top of the first loop-de-loop. This roller coaster's track is nearly frictionless, so resistance can be ignored. Using g = 9.

A bulldozer does 45,000 joules of work to push a boulder a distance of 30 meters. How much force is applied to push the?

The atomic emission spectra of a sodium atom on earth and of a sodium atom in the sun would be

The Mississippi River carries tons of tiny rock fragments called sediments into the Gulf of Mexico. What do u think will happen to these sediments in a few million years

True or False: If the initial speed of an object is zero, then the initial position of the object must be the origin. Explain