Answer:
Initial velocity of the bullet will be 307.63 m /sec
Explanation:
We have given that mass of the bullet 7.87 gram m= 0.00787 kg
Mass of the block M = 4.648 kg
So total mass M+m = 4.648 +0.00787= 4.655 kg
Spring constant k = 142.7
Compression x=9.46 cm = 0.0946 m
Now according to energy conservation
So initial velocity of the bullet will be 307.63 m /sec
Answer:
a) J=
b) F =
c) The force is 2551.02 times bigger than the weight of the pollen grain.
Explanation:
a) we know that the impulse J is equal to:
J =
where M is the mass, is the final velocity and the initial velocity. So, replacing values, we get:
J =
J =
J=
b) We know that the force is equal to:
F = J/t
where J is the impulse and t the time. So, replacing values, we get:
F =
F =
c) The weight W of the pollen grain is calculated as:
W =
W =
So, if we compare the force and the weight of the pollen grain, we get:
it means that the force is 2551.02 times bigger than the weight of the pollen grain.
Assume the motion when you are in the car or in the school bus to go to the school.
To describe the motion the first thing you need is a point of reference. Assume this is your house.
This should be a description:
- When you are sitting and the car has not started to move you are at rest.
- The car starts moving from rest, gaining speed, accelerating. You start to move away from your house, with a positive velocity (from you house to your school) and positive acceleration (velocity increases).
- The car reaches a limit speed of 40mph, and then moves at constant speed. The motion is uniform, the velocity is constant, positive, since you move in the same direction), and the acceleration is zero.
- When the car approaches the school, the driver starts to slow down. Then, you speed is lower but yet the velocity is positive, as you are going in the same direction. The acceleration is negative because it is in the opposite direction of the motion.
- When the car stops, you are again at rest: zero velocity and zero acceleration.
- In all the path your velocity was positive, constant at times (zero acceleration) and variable at others (accelerating or decelerating).
- When you comeback home, then you can start to compute negative velocities, as you will be decreasing the distance from your point of reference (your house).
<span>A theory of motivation by Steven Reiss, the 16 Basic Desires Theory talks about the sixteen fundamental needs, values and drives that motivate a person.</span>
Answer:
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Explanation:
ndndbcbnf