A moment is an expression involving the product of a distance and physical quantity, and in this way it accounts for how the physical quantity is located or arranged.
If the net force on a block is zero, the block will move at constant velocity
Explanation:
We can answer this question by applying Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:
(1)
where
is the net force on the object
m is its mass
a is its acceleration
In this problem, we have a block, and the net force on it is zero:
According to eq.(1), this also implies that
So, the acceleration of the block is zero.
However, acceleration is the rate of change of velocity of a body:
where is the change in velocity in a time of . Since the acceleration is zero, this means that , and therefore the velocity of the object is constant.
Learn more about Newton's second law:
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A radio wave is generated by a transmitter and then detected by a receiver. An antenna allows a radio transmitter to send energy into space and a receiver to pick up energy from space. Transmitters and receivers are typically designed to operate over a limited range of frequencies.
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Answer:
A scientist who studies thermodynamics might experiment with the instant ice packs where you have to pop a bag on the inside to create a chemical reaction to make it cold.
Answer:
After 1023.4 years the mass of the substance will be 30 g.
Explanation:
Hi there!
Let´s write the function (according to what I found on the web):
We have to find the time "t1" at which the mass of the substance is 30 g. Mathematically:
m(t1) = 30
Then:
Let´s solve the equation for t1. First, divide by 100 both sides of the equation:
[/tex]
Apply ln to both sides of the equation:
Use the logarithm property: ln (aᵇ) = b ln(a)
ln(0.3) = -t/850 · ln (e) (ln (e) = 1)
ln(0.3) = -t/850
850 ln(0.3) = -t
t = -850 ln(0.3)
t = 1023.4
After 1023.4 years the mass of the substance will be 30 g.