Which geochemical cycle involves mantle convection
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Why are the inner planets not made of light elements?
Special relativity questions?1.) 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 on Earth 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
A stealth bomber is flying straight and level at a constant speed of 150 m/s at an altitude of 3500 m above the ground. It drops a bomb intended to hit a specific target on the ground. a) How long will it take for the bomb to hit the ground? b) At what horizontal distance away from its target must the bomber release the bomb in order to strike its target?**disregard air resistance**
Simple True/False Physics QuestionA bar magnet cut in half will yield two complete bar magnets. True or False? An explanation of your answer would be appreciated.
A. Controls and variables are chosen.
B. The initial experiment is designed.
C. The initial hypothesis is formed.
D. Conclusions are drawn.
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It is usually the case that you first have to analyze the data after you've gather it and then you base your conclusions on it. This isn't, however, always the case.
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A parsec is a unit of distance. It's not something that a parson can parse.
Final answer:
A parsec is a unit of distance used in astrophysics to measure the distance between celestial objects. It is equal to 3.26 light-years or approximately 31 trillion kilometers.
Explanation:
A parsec is a unit of distance used in astrophysics to measure the distance between celestial objects. It is equal to 3.26 light-years or approximately 31 trillion kilometers. The concept of a parsec is based on stellar parallax, which is a method used to calculate distances to nearby stars.
Learn more about Parsecs
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c. symbolic form
b. the forefront
d. positive space
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Answer:
D. Positive space
Step-by-step explanation:
We are given that,
'Objects in a composition occupy ___'.
We know that,
In a composition the space occupied by the given object is known as the positive space, whereas any space around the object is known as the negative space.
So, we get that,
Objects in a composition occupy positive space.
Thus, option D is correct.
B. For a uniform symmetric object, the center of mass is at the center of symmetry.
C. The center of gravity of an object may be thought of as the "balance point."
D. The center of mass of an object must lie within the object.
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Answer:
The false statement is in option 'd': The center of mass of an object must lie within the object.
Explanation:
Center of mass is a theoretical point in a system of particles where the whole mass of the system is assumed to be concentrated.
Mathematically the position vector of center of mass is defined as
where,
is the position vector of the mass dm.
As we can see for homogenous symmetrical objects such as a sphere,cube,disc the center of mass is located at the centroid of the shapes itself but in many shapes it is located outside the body also.
Examples of shapes in which center of mass is located outside the body:
1) Horseshoe shaped body.
2) A thin ring.
In many cases we can make shapes of bodies whose center of mass lies outside the body.
B) Good insulators
C) Highly malleable
D) Good conductors
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A substance with freely moving electrons is a good conductor of electricity. Metals are an example of good conductors of electricity because of this one property. They have freely moving electrons due to the metallic bonding and they readily give up electrons.