The average speed of the motorist in the second half of the journey is determined as 7 km/h.
<h3>What is average speed?</h3>
The average speed of an object is the ratio of total distance to total time of motion.
- Let his average speed in the second half = x
21 = (35 + x) / 2
35 + x = 42
x = 42 - 35
x = 7 km/h
Thus, the average speed of the motorist in the second half of the journey is determined as 7 km/h.
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Answer:
The magnitude of the acceleration of earth due to the gravitational pull of earth is a = Gm/r^2
Where r = the center to center distance between the earth and the moon,
m = mass of the moon, and,
G is the gravity constant.
Explanation:
Detailed explanation and calculation is shown in the image below
Answer:
λ = 6 10⁻⁷ m
Explanation:
This problem is a double slit interference spectrum where bright maxima are described by constructive interference.
d sin θ = m λ
Where d is the gap of the slits (d = 0.2 10⁻³ m), m is the maximum interference and λ is the wavelength
We used trigonometry to find the angle
tan θ = y / x
Since the angles in these experiments are very small we use
tan θ = sin θ / cos θ = sin θ
sin θ = y / x
We substitute
d y / x = m λ
λ = d y / m x
In this case the first maximum is m = 1
We substitute
λ = 0.2 10⁻³ 3.6 10⁻³ / (1 1.2)
λ = 6 10⁻⁷ m
The approximation made in this problem is that since the angles are small we approximate the tangent to the sine
Young people
Explanation:
cuz old people can't do sports