Answer:
(a) E = 73.5mJ
(b) v = 2.188 m/s
(c) KE = 55.1 mJ
(d) PE = 18.37mJ
Explanation:
m = mass of the object = 0.03 kg
k = spring constant = 30 N/m
A = amplitude = 0.07 m
For part (a)
The total energy of the system can be found by:
E = k × A² / 2
E = (30 N/m) × (0.07 m)² / 2
E = 0.0735 J
E = 73.5mJ
For part (b)
The elastic potential energy in the spring at position d = 0.0105 m is:
PE = k × d² / 2
PE = (30 N/m) × (0.0105 m)² / 2
PE = 0.00165375 J
The kinetic energy at that point is:
KE = E - PE
KE = (0.0735 - 0.00165375)
KE = 0.07184 J
So its speed is:
KE = m × v² / 2
v = √( 2 × KE / m )
v = √( 2 × (0.07184 J) / (0.03 kg) )
v = 2.188 m/s
For part (d)
The elastic potential energy in the spring at position d = 0.035 m is:
PE = k × d² / 2
PE = (30 N/m) × (0.035 m)² / 2
PE = 0.018375 J
PE = 18.37mJ
For part(c)
The kinetic energy at that point is:
KE = E - PE
KE = (0.0735J) - (0.018375 J)
KE = 0.0551 J
KE = 55.1 mJ
Mary walks:
d 1 = 80 m, d 2 = 125 m, d 3 = 45 m
t = 10 minutes = 600 seconds;
Average speed:
v = ( d 1 + d 2 + d 3 ) / t
v = ( 80 m + 125 m + 45 m ) / 600 s
v = 250 m / 600 s
v = 0.4167 m/s ≈ 0.42 m/s
Answer:
E ) 0.42 meters/second
D. All of the above. When a wire loop is moved or rotated in a magnetic field, there is a change in magnetic flux which produces emf in wire loop and hence electric current is produced.
Stronger.....................becasue gravitational force is force pulling all matter (anything that has mass and occupies space) . The more the matter (which also includes mass), the more the gravitational force.
<span>So, the answer is stronger. </span>
Answer:
lol im pretty sure pipes and nice pic of lil darkie
Explanation:
2+2=4