A whale comes to the surface to breathe and then dives at an angle of 20.0 ∘ below the horizontal. If the whale continues in a straight line for 200 m , how deep is it?
Answers
Answer:
The depth is 68.4 meters.
Explanation:
In this question the whale rose to the surface of the ocean to breath and then dives into the ocean at an angle of 20° below the horizontal line. It then travels 200 m straight along this line. We have to determine the depth of the ocean.
The path of the whale forms the hypotenuse of a right triangle and the angle between the hypotenuse and base is given as 20°. Determination of sides or angles in a right triangle can be determines using trigonometry.
sinθ =
opposite side = sinθ
Here θ = 20°
sinθ = sin(20°) = 0.342
opposite side=
Hence the depth is 68.4 m.
Answer:
It is 68.404 m deep.
Explanation:
The motion of the whale can be seen in the form of a right-angle triangle.
Angle of deviation = 20°
We know that, sinФ = Perpendicular/ Hypotenuse.
Here, hypotenuse = 200 m
Depth is perpendicular that we have to find.
sin(20°) = Depth/200
Depth = sin(20°) * 200 = 68.404 meters.
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Answers
Answer:
HARDNESS
Explanation:
One key physical difference between transition metals and poor metals is their "" Hardness"" which is
the ability of a material to resist deformation. The test for hardness can be determined by a standard test which is the measurement of surface resistance to indentation. hardness tests are defined the shape and also type of indent.
The poor metals are also referred to as post transition metals. They are elements that are found at the right of the transition metals,they are located in the p-block,Their properties is as a result of their low melting and boiling point compare to other metals.They have high electronegativity and conductivity but softer texture compare to other metals.They are very soft more than the transition metals, but they cannot be cannot be classified as metalloids.
Poor metals includes elements in the periodic table such as; aluminium, gallium, indium, thallium, tin, lead, bismuth, and polonium.
Answer:
Hardness
Explanation:
I got it correct
Answers
Answer:
20.9 m/s
Explanation:
Given that,
Initial velocity, u = 16 m/s
We need to find its velocity 0.5 s into flight when a ball straight up into the air. Let it is v. It will move under the action of gravity. Using first equation of motion to find it as follows :
v=u+at
Here, a = g
v = 16 + 9.8(0.5)
v = 20.9 m/s
So, the final velocity is 20.9 m/s.
B. force
C. power
D. energy
Answers
Answer: core, iron, churning
Answers
Answer:
The Earth's magnetism is generated in the core, which is composed of iron that is constantly churning
Explanation:
Magnetic fields are produced by charges in motion, therefore by currents.
The outer core of the Earth consists mainly of melted iron that is in constant motion. This iron in motion actually acts as a giant current, and therefore it is responsible for the creation of the Earth's magnetic field.
The magnetic field of the Earth is very weak, in fact its magnitude is on average between 25 and 65 microtesla (for comparison, normal magnets can even produce magnetic fields of a few millitesla).
However, its role is very important for the Earth: in fact, it provides a shield that blocks most of the harmful radiation coming from the Sun.
Answer:
core, iron, churning
Explanation:
a. the light will reach the front of the rocket after it reaches the back of the rocket.
b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
c. the light will reach the front of the rocket before it reaches the back of the rocket. 2.) A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest in the rocket
a. the light will reach the front of the rocket before it reaches the back of the rocket.
b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
c. the light will reach the front of the rocket after it reaches the back of the rocket. 3.) An astronaut in an inertial reference frame measures a time interval Δt between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats?
a. Δt
b. less than Δt
c. more thanΔt
d. The answer depends on whether they are moving toward her or away from her. 4.) You are a passenger on a spaceship. As the speed of the spaceship increases, you would observe that
a. the length of your spaceship is getting shorter.
b. the length of your spaceship is not changing.
c. the length of your spaceship is getting longer. 5.) A star is moving towards the earth with a speed at 90% the speed of light. It emits light, which moves away from the star at the speed of light. Relative to us on earth, what is the speed of the light moving toward us from the star?
a. 0.90c
b. 1.9c
c. 1.20c
d. 1.1c e,) c
Answers
(1) b. the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
(2) a. the light will reach the front of the rocket before it reaches the back of the rocket.
(3) b. less than Δt
(4) c. the length of your spaceship is getting longer.
(5) c. 1.20c
Answers
Let's figure it out.
The charge on one electron is 1.60 x 10⁻¹⁹ Coulomb .
To get 3,500 Coulombs of charge, you'd need to
go around and collect
(3,500) / (1.60 x 10⁻¹⁹) electrons.
That's 2.19 x 10²² of the little fellas.
That's a big number. But what's REALLY amazing is the
mass and weight of that many electrons:
Mass: 1.989 x 10⁻⁵ gram
Weight: about 0.0000007 ounce !
That's not one electron. That's the whole 2.19 x 10²² uvvum
that it takes to hold 3,500 Coulombs of charge.