A combustion reaction usually gives off heat and light is it true or false

According to the trend shown by the graph 750 ml of water should take approximately 20 minutes to boil? a. true b. false

Sudden, hard steering to the left would shift the center of mass to shift to: A) The front of the car causing a drop and tilt of the front hood. B) The back of the car causing a drop and tilt of the rear.

A 76-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 840 N. What is the acceleration of the elevator? 1.25 Correct: Your answer is correct. m/s2 upward

Juan lives 100 M away from Bill what is Juan's average speed if he reaches bills home in 50 seconds

A circular arc has a uniform linear charge density of 4 nC/m. 287 ◦ 2.5 m x y What is the magnitude of the electric field at the center of the circle along which the arc lies? The value of the Coulomb constant is 8.98755 * 109 N · m2 / C 2.

Why is it important to change only one experimental variable at a time in an experiment?

A 0.0663 kg ingot of metal is heated to 241◦C and then is dropped into a beaker containing 0.395 kg of water initially at 25◦C. If the final equilibrium state of the mixed system is 27.4 ◦C, find the specific heat of the metal.

What does it mean when we say an atom has decayed?

If the mass of a material is 77 grams and the volume of the material is 19 cm3, what would the density of the material be

A bicyclist is in a 50-km race. She says she had an average velocity of 35. What is missing in the cyclist's velocity? A. units only B. units and distance C. direction only D. units and direction