Answer:
81 m
Explanation:
Given:
v₀ = 0 m/s
a = 2 m/s²
t = 9 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (0 m/s) (9 s) + ½ (2 m/s²) (9 s)²
Δx = 81 m
Kilowatt is a unit of power ... a RATE of using energy. Kilowatt-hour is an amount of energy ... the amount used in 1hour at the average rate of 1 kilowatt. (Or in 1,000 hours at the average rate of 1 watt.)
Answer:
Frying an Egg
Explanation:
When chemical bonds are broken or formed, new particles are created. Therefore, frying an egg is a chemical change because it results in the formation of new particles.
Answer:
41.27m/s
Explanation:
According to law of conservation of momentum
m1u1+m2u2 = (m1+m2)v
m1 and m2 are the masses
u1 and u2 are the initial velocities
v is the velocity after impact
Given
m1 = 0.2kg
u1 = 43.7m/s
m2 = 45.9g = 0.0459kg
u2 = 30.7m/s
Required
Velocity after impact v
Substitute the given parameters into the formula
0.2(43.7)+0.0459(30.7) = (0.2+0.0459)v
8.74+1.409 = 0.2459v
10.149 = 0.2459v
v = 10.149/0.2459
v = 41.27m/s
Hence the speed of the golf ball immediately after impact is 41.27m/s