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3 years ago

Which of the following statements does NOT use the term angular size or angular distance correctly?

Physics

1 answer:

Verizon [17]3 years ago

3 0

Answer: Statement 1 is incorrect.

Reason:

Unit of measure of angular distance is not meters.

Explanation:

The term 'angular size' is used to describe the apparent size of the objects in the night sky.

The angular distance is defined as the angle through which an object moves on a circular path. The SI unit is radian.

Other units are revolution (rev) and degrees.

In statement 1, angular distance is measured in meters which is incorrect. In other options, there is no factual mistake so they are correct.

Let's discuss them,

Statement 2:

Here, we are talking about the use of outstretched hand to estimate the angular distances and sizes which is correct.

Statement 3:

This statement talks about the same angular sizes of the sun and the moon, here the term is again used correctly.

Statement 4:

Here, the angular distance is measured in the correct units i.e, degrees so this statement is also correct.

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A car is traveling at 7.1m/s accelerates 4.3 m/s^2 to reach a speed of 16.0 m/s how long does it take for this acceleration to o

Bond [772]

Answer

2.06977 seconds

Explanation

Acceleration, a, is the rate of change of velocity

a = (v-u)/t

where v and u are final and initial velocities respectively.

4.3 = (16.0 - 7.1)/t

4.3 = 8.9/t

t = 8.9/4.3

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3 years ago

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kvv77 [185]

Answer:

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2 years ago

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yarga [219]

A phase of moon with more than half sunlit portion visible on the right

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3 years ago

The velocity time graph of an object is shown below. How far does the object travel in the time interval t =4 s to t = 6 s?

Trava [24]

The distance covered by the object between t =4 s and t = 6 s is 4 m

Explanation:

In a velocity-time graph, the distance covered by the object represented can be found by calculating the area under the curve.

Therefore, the distance covered by the object between t = 4 s and t = 6 s is the area under the curve between 4 s and 6 s.

We see that we have to calculate the area of a triangle, with:

Base:

$b=6-4 = 2$

And height:

$h=4-0 = 4$

Therefore, the area is

$A=\frac{1}{2}bh=\frac{1}{2}(2)(4)=4$

So, the distance covered by the object is 4 m.

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3 years ago

Hello, please anybody help if you can!!

Vinil7 [7]

This is called "projectile motion". The projectile can be a baseball,
a bullet, a golf ball, or a rock that somebody tossed. In this story,
the swimmer is the projectile.

In projectile motion, the projectile is moving part horizontally and part
vertically at the same time. The thing to remember about this kind of
motion is: The horizontal motion doesn't change, but the vertical motion
changes because of gravity ... just like an apple that fell from a tree.

The swimmer runs straight horizontally off the diving board. His horizontal speed is 3.62 m/s. He hits the water 1.68 m from the end of the board. How long did it take him to go that far ?

   Time = (distance) / (speed)

   = (1.68 m) / (3.62 m/s)

   = (1.68 / 3.62) seconds

   =    0.464 second .

(a).
How high above the water was the diving board ?
Well, the swimmer was falling for 0.464 second .
The height is whatever it takes 0.464 second to fall.

   Height = (1/2) x (acceleration of gravity) x (time)²

      = (1/2) x (9.8 m/s²)    x (0.464 sec)²

=    (4.9 m/s²)    x (0.2153 sec²)

=    (4.9 x 0.2153) meters

=    1.055 meters .

(b).
If the swimmer runs off the board slower, his horizontal speed is
lower. That only affects how far out in front of the board he'll be
when he hits the water. But his horizontal speed has no effect
on how long it takes him to fall to the water. That's his vertical
speed, and it only depends on gravity.
No matter how fast or slow he runs off the board, or if he just
stands there at the end and leans over until he falls, it takes him
the same time to reach the water in every case.

6 0

3 years ago