PLEASEEE HELP, thank you :)
Answers
Answer:
The answer is B.
Explanation:
Given that the current (Ampere) in a series circuit is same so we can ignore it. We can assume that the total voltage is 60V and all the 3 resistance are different, 20Ω, 40Ω and 60Ω. So first, we have to find the total resistance by adding :
Total resistance = 20Ω + 40Ω + 60Ω
=120Ω
Next, we have to find out that 1Ω is equal to how many voltage by dividing :
120Ω = 60V
1Ω = 60V ÷ 120
1Ω=0.5V
Lastly, we have to calculate the voltage at R1 so we have to multiply by 20 (R1) :
1Ω = 0.5V
20Ω = 0.5V × 20
20Ω = 10V
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Answers
Answer and Explanation:
In classical physics we study about macroscopic objects and in modern physics we study about microscopic objects but under some circumstances classical physics is a approximation to modern physics such as
- The object must be microscopic but they should be large enough so that we can see that through a microscope
- The speed of the object should be very less it should be about 1 % of the speed of the light
- They should be involved with very week gravitational field
Answer:
Classical physics is a good approximation to modern physics under these certain circumstances: Matter must be moving at speeds less than about 1% of the speed of light, the objects dealt with must be large enough to be seen with a microscope, and only weak gravitational fields, such as the field generated by the Earth, can be involved.
Explanation:
The grass did not exert an action force.
The grass shortens the time of the collision.
The grass extends the time of the collision.
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Answer : Because the grass extends the time of the collision.
Explanation :
Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.
He had fewer injuries to the area of her body that hit the grass because the grass extends the time of the collision and hence it imparts less impulse.
i.e.
Where
F is the force
t is the time of collision
Hence, the correct option is (d) " The grass extends the time of the collision ".
Answers
Answer:
24.1 m/s
Explanation:
Using newton's equation of motion,
s = (v+u)t/2 .............................. Equation 1
Where s = distance, v = Final velocity, u = initial velocity, t = time.
making v the subject of the equation,
v = (2s/t)-u........................... Equation 2
Given: s = 3.2 km= ( 3.2×1000) m = 3200 m , t = 3.5 min = (35× 60 ) s = 210 s, u = 6.4 m/s.
substitute into equation 2
v = (2×3200/210)-6.4
v = 24.076 m/s
v ≈ 24.1 m/s
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Conduction is the heat transfer that happens between two bodies in direct contact, due to the collision of the molecules, atoms and electrons within the body (microscopical level).
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where v is the velocity of the wave, f is the frequency of the wave and λ is the wavelength of the wave.
assuming that the velocity of the wave remains constant, by increasing the wavelength the frequency must decrease.
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its false guys this easy