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julsineya [31]
3 years ago
13

Do you think energy can be “used up?” Why or why not?

Physics
1 answer:
My name is Ann [436]3 years ago
8 0
I dint think energy can be used up because energy cant be created nor destroyed
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A certain electric circuit obeys Ohm's law. If the resistance of the circuit is doubled, what will happen to the current through
netineya [11]

Answer:

currrent will be halved

Explanation:

v = ir

v/r = i      multiply both sides by  1/ 2

v / (2r) = 1/2 i  

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3 years ago
every object that has mass attracts every other object with a gravitational force. it has been proven that the size of the gravi
erastova [34]

Answer;

- This statement about matter and its behavior is best classified as a Law.

-It is the Law of Universal Gravitation.

Explanation;

-The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe by a force pointing in a straight line between the centers-of-mass of both points, and this force is proportional to the masses of the objects and inversely proportional to their separation.This attractive force always points inward, from one point to the other.

-The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric.

3 0
3 years ago
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What is the the acceleration of a proton that is 4.0 cm from the center of the bead? input positive value if the acceleration is
QveST [7]
Missing detail in the text:
"<span>A small glass bead has been charged to + 25 nC "

Solution
The force exerted on a charge q by an electric field E is given by
</span>F=qE
<span>Considering the charge on the bead as a single point charge, the electric field generated by it is
</span>E=k_e  \frac{Q}{r^2}
with k_e = 8.99\cdot 10^9 Nm^2/C^2, Q=+25 nC=25 \cdot 10^{-9}C is the charge on the bead. We want to calculate the field at r=4.0 cm=0.04 m:
E=(8.99\cdot 10^9) \frac{25\cdot 10^{-9}}{(0.04)^2}=1.4\cdot 10^5 V/m
The proton has a charge of q=1.6\cdot 10^{-19}C, therefore the force exerted on it is
F=qE=1.6\cdot 10^{-19}C \cdot 1.4\cdot 10^5 V/m=2.25\cdot 10^{-14} N

And finally, we can use Newton's second law to calculate the acceleration of the proton. Given the proton mass, m=1.67\cdot 10^{-27} kg, we have
F=ma
a= \frac{F}{m}= \frac{2.25\cdot 10^{-14} N}{1.67\cdot 10^{-27} kg}=1.35 \cdot 10^{13} m/s^2

The charge on the bead is positive, and the proton charge is positive as well, therefore the proton is pushed away from the bead, so:
a=-1.35 \cdot 10^{13} m/s^2
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4 years ago
How does a pulley make work easier?
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it helps use less weight to pick up things and makes it way easier to work

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Why does a ship need an anchor
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So there is extra wait that pulls the boat to stop.

Can i get brainliest I need it

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