First we need to find the speed of the dolphin sound wave in the water. We can use the following relationship between frequency and wavelength of a wave:
where
v is the wave speed
its wavelength
f its frequency
Using
and
, we get
We know that the dolphin sound wave takes t=0.42 s to travel to the tuna and back to the dolphin. If we call L the distance between the tuna and the dolphin, the sound wave covers a distance of S=2 L in a time t=0.42 s, so we can write the basic relationship between space, time and velocity for a uniform motion as:
and since we know both v and t, we can find the distance L between the dolphin and the tuna:
The mirror formula for the curved mirrors is 1/f = 1/v + 1/u.
Mirror Formula:
The mathematical expression determining the distance of image and distance of the object from the mirror, without drawing a ray diagram, is known as the mirror formula.
The mirrors whose reflecting surfaces are curved in nature are known as curved mirrors. The curved mirrors are either bulged outwards (convex mirrors) or bulged inwards (concave mirrors).
The mirror formula for the curved mirrors are given as,
here,
f is the focal length of the mirrors.
v is the image distance.
u is the object distance.
Thus, we can conclude that the mirror formula for the curved mirrors is 1/f = 1/v + 1/u.
Learn more about the mirror formula here:
brainly.com/question/14343950
Work is Force X Distance. The force is equal to mass X acceleration (F=MA). In this case the acceleration is gravity, which is 9.81 m/s^2. So you multiply 500 by 9.81 to get 4905 Newtons (N). This is the amount of force required to lift the safe. Multiply this force by the distance, which in this case is 90 meters. This gives you 441450 Newton Meters (N*m) of work. 1 N*m is equivalent to 1 Joule (J), so the answer can be written as 441450 Joules (J).
Answer:
By definition, air resistance describes the forces that are in opposition to the relative motion of an object as it passes through the air. These drag forces act opposite to the oncoming flow velocity, thus slowing the object down.
Explanation: