In order for a reaction to begin, what is required?

activation energy

ionic bonding

precipitate forming

bubbling

The angle between a flashlight beam that strikes a mirror and the reflected beam is 80 degrees. What is the angle of incidence?

The motions of the toy robot shown above are driven by an electric motor. The power source for the toy's motor is a pair of batteries. Which of the following best summarizes the energy transformations taking place in the toy robot? A.

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2. What is the mass of the car? A. 9.8 kg B. 1500kg C. 3000 kg D. 6000 kg

A small refracting telescope designed for individual use has an objective lens with a diameter of 6.00 cm and a focal length of 1.325 m. what is the f-number of this instrument?

An airplane starts from rest and accelerates at a constant rate of 3.00 m/s2 for 30.0 s before leaving the ground. a. How far did it move? b. How fast was it going when it took off?

In order for an object to accelerate, what must be applied?

The switch S is closed at t = 0 (assume that the battery voltage remains constant at 10V and the resistance of the inductor is negligible).

Atoms are the smallest portions of an element that retain the original characteristics of the element. True or false

Which statement is true about light when it slows down upon entering another medium A. Light bends less, and there is a greater refraction B. Light bends more, and there is a greater refraction C. light bends less, there is a less refraction D.

Why can you cross sentran type of animals