A 2.3 kg block is pulled across a friction-free horizontal surface, stretching a spring that has a spring constant of 18 N/m. At the moment it is released, the block accelerates at 0.27 m/s2. What is the net force that the spring exerts on the block?
N
How far was the spring stretched at the moment it was released?
Answers
To find the force on the block, use Newton #1: F = m A
Force = (2.3 kg) x (0.27 m/s²)
Force = (2.3 x 0.27) kg-m/s²
Force = 0.621 Newton
The spring stretches 1 meter when to pull with 18 N of force.
To pull with only 0.621 N of force, it only has to stretch (0.621/18) of a meter. That's 0.0345 meter, or 3.45 cm .
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Explain what it mean to say that energy is conserved
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Every chemical and physical change in matter includes a change in energy.
Energy is conserved in a chemical change.
Energy is never created or destroyed.
Energy is only transformed from one form to another.
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Answer with Explanation:
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Subatomic Particle=Smaller than Atom(Electron +Proton)
Electron = -vely Charged Particle
Proton =+vely Charged Particle
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Answers
Answer:
5.87 m, 75.5°
Explanation:
Let's say C is the resultant vector.
The x component is the sum of the x components of A and B.
Cx = Ax + Bx
Cx = 10.1 cos 60° + 7.3 cos 275°
Cx = 5.69
The y component is the sum of the y components of A and B.
Cy = Ay + By
Cy = 10.1 sin 60° + 7.3 sin 275°
Cy = 1.47
The magnitude is found with Pythagorean theorem, and the angle is found with trigonometry.
C² = Cx² + Cy²
C² = 5.69² + 1.47²
C = 5.87
θ = atan(Cy / Cx)
θ = atan(5.69 / 1.47)
θ = 75.5°
Answers
First we have to calculate the time taken to travel the distance 30 m, is
.
Now from equation of motion,
Given, .
As object starts from rest, so u = 0.
Substituting these values in above equation, we get
.
Thus, the acceleration is
energy?
A energy of moving electrons
B vibrations of particles of matter
C energy that moves things
D vibrations that move tiny bones in the ear
Help me 30 points
Answers
Answer:
Energy that moves things. Think of your arm grabbing a glass of water. That's a form of mechanical energy because you just moved something.
Answers
Hope this helps :)
(current)² times (resistance).
You can see that in order to minimize the power lost in transporting electrical
energy from one place to another, you'd want to make both the resistance of
the conductors and the current through the lines as low as possible.
The resistance is reduced by using heavier (fatter) conductors, and using
as much silver or copper in them as possible ... both very expensive.
Power = (current) times (voltage), so the way to reduce the current while
shipping the same power from place to place is to increase the voltage.
That's exactly what the transformer does ... it changes the voltage and
current, while keeping their product the same. It's used to step the voltage
up for transmission, in several steps from the generating station all the way
to the residential neighborhood, and then finally back down, on the pole
near your house.