Burning is a chemical change because when your burning something your releasing chemicals into the air ( turning it into gas , like CO2) , it requires more energy to break chemical bonds. Melting/bending your just changing the physical look of object, boiling your just heating it but the make up of the object is still the same.
This is called average speed.Its really simple
Answer:
The side of the paper with sunblock lotion stays on its the same color/tone while the other side of the paper without sunblock lotion faded
Explanation:
Ultraviolet (UV) radiation from the sun is the main cause of skin cancer, so one of the best ways to prevent skin cancer is to protect your skin from sun exposure with the use of sunscreen/sunblock. The sunlight that reaches us is made up of two types of harmful rays: long waves (UVA) and short waves (UVB)
Complete Question
A 10 kg medicine ball is thrown at a velocity of 15 km/hr ( m/s) to a 50 kg skater who is at rest on the ice. The skater catches the ball and subsequently slides with the ball across the ice.
Calculate the kinetic energy after collision(in joules).
Answer:
Explanation:
From the question we are told that:
Mass of ball
Speed
Mass of Skater
Generally the equation for conservation of momentum is mathematically given by
Generally the equation for Kinetic energy is mathematically given by
Therefore kinetic energy K.E after collision is given as