Answer:
An image of the cosmic microwave background radiation, taken by the European Space Agency (ESA)'s Planck satellite in 2013, shows the small variations across the sky (Image credit: ESA/Planck Collaboration) The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began
Explanation:
Explanation:
Substances become neutral at the number 7 because at this point, the acid and Base are equal and becomes neutralized
The ratio between initial and final speed is 3:4
Explanation:
The speed of a wave is given by the wave equation:
where
v is the speed
f is the frequency of the wave
is the wavelength
In this problem, we have a wave with wavelength and initial frequency
So its speed can be written as
Later, its frequency changes to
Assuming that its wavelength has not changed, this means that its new speed is
By calculating the ratio between the two,
So, the ratio between initial and final speed is 3:4.
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Answer:
The current in the rods is 171.26 A.
Explanation:
Given that,
Length of rod = 0.85 m
Mass of rod = 0.073 kg
Distance
The rods carry the same current in the same direction.
We need to calculate the current
I is the current through each of the wires then the force per unit length on each of them is
Using formula of force
Where, m = mass of rod
l = length of rod
Put the value into the formula
Hence, The current in the rods is 171.26 A.
Answer: d) 20J
Explanation:
Work done by a Force refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.
It should be noted that it is <u>a scalar magnitude</u>, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter:
Now, <u>when the applied force is constant and the direction of the force and the direction of the movement are parallel</u>, the equation to calculate it is:
(1)
When they are not parallel, both directions form an angle, let's call it . In that case the expression to calculate the Work is:
(2)
In this case both (the force and the distance in the path) are parallel, so the work performed is the product of the force by the distance traveled . as shown in equation (1).
Hence:
>>>>This is the work