Answer:
Explanation:
Acceleration is the change in velocity with respect to time.
Acceleration = change in velocity/Time
Acceleration = final velocity - initial velocity/Time
Given initial velocity = 10m/s
Final velocity = 20m/s
Time taken = 4s
Acceleration = 20-10/4
Acceleration = 10/4
Acceleration =2.5m/s²
For the second part of the question:
Given parameters
initial velocity = 15m/s
acceleration = -3m/s²
time = 4seconds
a = v-u/t
-3 = v-15/4
cross multiply
-12 = v-15
add 15 from both sides
-12+15 = v-15+15
3 = v
<em>Hence the final velocity of the car is 3m/s</em>
Answer:
3.32 rad/s
Explanation:
Centripetal acceleration is:
a = v² / r
Angular velocity is:
ω = v / r
v = ωr
Substituting:
a = (ωr)² / r
a = ω² r
Given that a = 20 g and r = 17.8 m:
20 (9.8 m/s²) = ω² (17.8 m)
ω = 3.32 rad/s
D: the number of protons determines the atomic number of an atom
1500m = 1 sec
9000m/1500 = 6
So, it would take 6 sec to go 9000m
