Which of the following questions best highlights a shortcoming of the big bang theory? A. How could energy become the matter present today?
B. What makes people think that the universe started from a single point?
C. How can all galaxies be moving away from Earth?
D. What was the cause of the big bang?
Answers
Answer:
What was the cause of the big bang theory?
Explanation:
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When is orange is the new black episodes come out
Calculate (A⃗ ×B⃗ )⋅C⃗ for the three vectors A⃗ with magnitude A = 4.86 and angle θA = 23.5 ∘ measured in the sense from the +x - axis toward the +y - axis, B⃗ with B = 4.02 and θB = 60.1 ∘, and C⃗ with magnitude C = 6.02 and in the +z - direction. Vectors A⃗ and B⃗ are in the xy-plane.
The sound wave produced can best be described as a ?
Tgfdsasdxcv bnhuytredwsedfghjhgtresdxc nhgbnjuy6
Answers
112444811Explanation:
;;lo
b. an object at rest
c. traveling around a circular track
d. an object in free fall
Answers
Answer:
c. traveling around a circular track
Explanation:
Acceleration is defined as the rate of change of velocity per unit time:
However, velocity is a vector quantity. This means that acceleration can be due to:
- A change in the speed of an object, or
- A change in the direction of the object
Let's analyze each choice:
a. increasing speed while traveling around a curve --> in this case, both speed and direction are changing (the direction is changing since the object is moving around a curve), so this is not the correct choice
b. an object at rest --> here neither the speed nor the direction are changing (in fact, the object is not accelerating), so this is not the correct choice
c. traveling around a circular track --> here the direction is changing (because the track is circular), while we don't know anything about the speed. If we assume the speed to be constant, then this is the correct choice
d. an object in free fall --> here the speed is changing, while the direction not, so this is not the correct choice
'Traveling around a circular track' can be a description of constant
acceleration due only to changes in direction. But if it is, then the
progress around the circular track must be at constant speed.
Answers
Answer:
3,000 m/s
Explanation:
3,000 m/s
Answers
how long it burns after launch, how much force it exerts, how much
impulse or acceleration it imparts to the rocket, etc.
The only thing we can do with this question is to think of the craft as
a rock instead of a rocket ... assume that after launch, there are no
forces on it except the force of gravity.
Acceleration of gravity = 9.8 m/s²
This is the amount of speed lost each second.
So the rocket continues to climb for (18.2)/(9.8) = 1.857 seconds
At the bottom, its speed is 18.2 .
At the top, its speed is zero.
Its average speed during the climb is (1/2) (18.2 + 0) = 9.2 m/s .
It climbs at an average speed of 9.2 m/s for 1.857 seconds.
It reaches the altitude of (9.2) x (1.857) = 17.09 meters above the launch pad.
v² = u² + 2gh
as final velocity is 0 m/s ; accleration due to gravity = 9.8 m/s²
(0)²=(18.2)²+2(-9.8)(h)
0=331.24 - 19.6(h)
(-331.24) ÷ (-19.6) = h
therefore h = 16.9 meters
Answers
12000m / 4 m/s = 3000s
just under one hour
B. that regularly stops and starts again
C. that moves in only one direction
D. that stops at a specific point
Answers
Answer: Direct current = that moves in only one direction
Explanation :
Electric current is defined as the electric charge per unit time. The electric current is of two types
- Direct current
- Alternating current
In direct current, the current flows one in one direction while in alternating current the current changes its direction periodically. So, the correct statement that describes the direct current is " (C) that moves in only one direction ".