Answer:
C ) Electric charge.
Explanation:
Amber is used in the experiments related to static electricity.
In electrostatics, elektron was the word used as a variation to amber, by the Greeks. Amber buttons, when rubbed with cloth, attracted hair.
Studies showed that when amber is rubbed with fur, fur became negatively charged and amber became positively charged. That is because amber loses its electrons to fur.
Answer:
1.7N
Explanation:
Force = kx
Where x = spring compression and
K = spring constant
K =85N/m
x = 2.0cm / 100
= 0.02m
Force = 85 x 0.02
= 1.7N
<span>The equation that relates force and torque is Torque = Force*length*sin(angle). Plug in the given values to the equation (convert length to meters first): -13 = Force * 0.35 * sin(30 degrees). Rearrange to solve for Force: Force = -13/(0.35 * 0.5) = -74.3 N (which is the same as a downward force of magnitude 74.3 N.</span>
The total mechanical energy is
Explanation:
The total mechanical energy (TME) of an object is equal to the sum of its gravitational potential energy (U) and its kinetic energy (K):
When the car is at rest 50 m above the ground, its speed is zero, therefore its kinetic energy is zero as well:
K = 0
This means that the TME is just equal to the gravitational potential energy:
where:
m is the mass of the car
is the acceleration of gravity
h is the height above the ground
For the car in the problem,
m = 575 kg
h = 50 m
Substituting,
Learn more about gravitational potential energy:
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