Answer:
The value is
Explanation:
From the question we are told that
The speed of the marathon runner is
The distance from the distance from the finish is
The speed of the bird is
Generally the time taken for the runner to reach the finish is mathematically represented as
So the distance covered by the bird is
Answer:
The focal length of the lens and the height of the image are -6.86 cm and -0.638 cm.
Explanation:
Given that,
Distance of the object u = -16.0 cm
Distance of the image v = -12.0 cm
Height of the object = 8.50 mm = 0.85 cm
(a). We need to calculate the focal length
Using lens's formula
Where, f = focal length
u = distance of the object
v = distance of the image
Put the value into the formula
The lens is diverging.
(b). Using formula of magnification
Put the value in to the formula
The image is inverted.
Hence, The focal length of the lens and the height of the image are -6.86 cm and -0.638 cm.
<span>(60km/hr) * (1000m/km)
km cancels with km
=60,000m/hr)
(60,000m/hr) * (1hr/3600s) = 16.67m/s</span>
Answer:
(d) -5.6 m/s in opposite direction
Theory:
From the conservation of momentum we know that the collision
between two objects will result in the conservation of initial
momentum and the final momentum i.e.,
Pi = Pf
Solution:
Given:
m₁ = 1.5 kg
u₁ = 11.2 m/s
m₂= 4.5 kg
u₂= 0
v₂= 5.6 m/s
To Find:
v₁= ?
Using momentum conservation
m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂
substituting the values:
1.5 × 11.2 + 4.5 × 0 = 1.5 × v₁ + 4.5 × 5.6
16.8 + 0 = 1.5 × v₁ + 25.2
-8.4/ 1.5 = v₁
v₁ = - 5.6 m/s
Here, -ve sign shows that body is moving in the opposite
direction.
Hence, option (d) is correct.
Learn more about energy conservation here:
brainly.com/question/2807738
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