Answer:
melting butter in a saucepan, as the butter cools it turns brown
Explanation:
although melting the butter is a physical change, but the butter being cooked and turning brown Is a chemical change, because due to the heat, its particles are being broken down, which is irreversible, and shows a chemical change.
Answer:
3,000 stars.
Explanation:
Subtract the magnitude of the single star from the magnitude of the star cluster.
(+4) - (+1) = +3
Then multiply your answer by 1000
= 3,000 is a stars.
Answer:
1380 kph west
Explanation:
The resultant velocity is the sum of airplane velocity with respect to air and the velocity of wind with respect to ground. Since these 2 vectors are in opposite direction (east vs west), we will take the 20 kph east as negative
1400 west + 20 east = 1400 west + (-20)west = 1380 kph west.
Answer:
We use the relationship F = m x a, adapted for Weight: W = m x g
Weight is the force, m is the mass and g is the acceleration of gravity. Take an example: you are 100 kg made up of 70 kg of body mass and 30 kg of space suit. Your weight on the Moon would be 100 kg x 1.62 m/s^2 = 162 Newtons (weight force).
On Earth that would be a Weight of 100 kg x 9.81 m/s^2 = 981 Newtons.
Explanation: