Answer:
sec
Explanation:
Consider the down direction as negative and upward direction as positive.
= mass of the bullet = 0.00728 kg
= mass of the wooden block = 2.75 kg
= velocity of the bullet before striking the block = 641 ms⁻¹
= velocity of the wooden block before collision
= velocity of the wooden block + bullet after collision = V
Using conservation of momentum
ms⁻¹
Consider the motion of the wooden block in free fall after being dropped:
= Initial velocity of the wooden block = 0 ms⁻¹
= acceleration of the wooden block = - 9.8 ms⁻²
= time of travel
= Final velocity of the wooden block = - 0.85 ms⁻¹
One the basis of above set of data , we can use the kinematics equation
sec
Answer:
Explanation:
spring constant k = 425 N/m
a ) At the point of equilibrium
restoring force = frictional force
= kx = 10 N
425 x = 10
x = 2.35 cm
b )
Work done by frictional force
= -10 x 2.35 x 10⁻² x 2 J ( Distance is twice of 2.35 cm )
= - 0.47 J
= Kinetic energy remaining with the cookie as it slides back through the position where the spring is unstretched .
= 425 - 0.47
= 424.53 J
=
Answer:
the potential energy is 114 J.
Explanation:
Given;
total mechanical energy, E = 400 J
kinetic energy, K.E = 286 J
The potential energy is calculated as follows;
E = K.E + P.E
where;
P.E is the potential energy
P.E = E - K.E
P.E = 400 J - 286 J
P.E = 114 J
Therefore, the potential energy is 114 J.
The speed of the cart after 3 seconds of Low fan speed is equal to 54 cm/s.
<h3>How to calculate the speed?</h3>
Mathematically, speed can be calculated by using this formula;
Speed = distance/time
At Low fan speed after 3 seconds, the distance covered is 162 cm:
Speed = 162/3
Speed = 54 cm/s.
At Medium fan speed after 5 seconds, the distance covered is 600 cm:
Speed = 600/5
Speed = 120 cm/s.
At High fan speed after 2 seconds, the distance covered is 128 cm:
Speed = 128/2
Speed = 64 cm/s.
Read more on speed here: brainly.com/question/17350470
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Magnetic forces act at a distance. The opposites attract and pull each other closer