How do you know there was a chemical reaction? Check all indicators below. A solid precipitate formed. The color changed. A gas was produced. The reaction absorbed or released heat.

A photon has a wavelength of 500nm what is the energy associated

a 150 kg object takes 1.5 minutes to travel a 2,500 meter straight path. It begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. What was its acceleration?

Urban heat islands affect local air current and weather conditions including: 1) increased number of thunderstorms over cities in summer months 2) lingering dust domes over cities 3) stronger natural disasters such as earthquakes and hurricanes 4)

The distance between the earth and the sun is about 2.5x10¹¹m. Express SI prefix in kilometers

The chemical name for laughing gas is dinitrogen oxide. The two elements found in a sample of this gas are

What is the momentum of a 2 kg ball traveling at 2m/s

A constant force is exerted for a short distance on a block of mass that is initially at rest on a horizontal frictionless plane. This force gives the block a certain final speed v.

A football quarterback is moving straight backward at a speed of 3.00 m/s when he throws a pass to a player 20.0 m straight downfield. (a) if the ball is thrown at an angle of 25.

Simone is walking her dog on a leash. The dog is pulling with force of 34 N to the right and simone is pulling backward with a force of 16 N

An object moves with velocity v (t) = t^2-8t+7 a) write a polynomial expression for the position of the particle at any time t greater or equal to zero.