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Tanya [424]
2 years ago
10

An object of mass M is placed on a disk that can rotate. One end of a string is tied to the object while the other end of the st

ring is held by a pole that is located at the center of the disk. Initially, the object is spun in a horizontal circle of radius R at a constant tangential speed of v0, as shown in the figure, such that the tension in the string is T. At a later time, the disk is spun such that the tangential speed of the object is increased to 2v0 . At a later time, the tangential speed of the object is increased to 3v0 . Which of the following diagrams could represent the forces exerted on the object at one of the given speeds? Assume that the force of static friction is negligible. Select two answers.
2T
3T
4T
9T
Physics
2 answers:
Mars2501 [29]2 years ago
7 0

Answer:

Graphic labeled 4t and graphic labeled 9t

polet [3.4K]2 years ago
6 0

Answer: 4t and 9t

Explanation:

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a care starting from rest has an acceleration 0.3 m/s square, calculate the velocity and distance travelled by this car after 2
Anna [14]

Answer:

Final velocity (v) = 36 m/s

Distance traveled (s) = 2,160 m

Explanation:

Given:

Initial velocity (u) = 0

Acceleration (a) = 0.3 m/s

Time travel (t) = 2 minutes = 120 seconds

Find:

Final velocity (v) = ?

Distance traveled (s) = ?

Computation:

v = u + at

v = 0 + 0.3(120)

v = 0.3(120)

v = 36 m/s

Final velocity (v) = 36 m/s

Distance traveled (s) = ut + (1/2)at²

Distance traveled (s) = (0.5)(0.3 × 120 × 120)

Distance traveled (s) = 2,160 m

3 0
3 years ago
Which of the following best describes the type of bond formed when sodium reacts with chlorine?
SVEN [57.7K]

Answer: ionic bond

Explanation: This type of chemical bond is called an ionic bond because the bond formed between two ions of opposite charge.

6 0
2 years ago
What is the acceleration formila
diamong [38]

Answer:

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3 0
2 years ago
Which of the following would likely be the best reflector of heat energy
Alex73 [517]
If these are the missing choices: 
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B. bumpy red surface.
C. dull orange surface.
D. Polished pale yellow surface.

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I read an article that summarized the results of the emission of radiation experiments. It stated the following:
1) </span>Black surfaces are the best emitters of heat radiation.
2) Black surfaces are the best absorbers of heat radiation.
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4) Shiny surfaces are poor absorbers of heat radiation.
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Because of the above summary, that is why I arrived at the answer D. Polished pale yellow surface would likely be the best reflector of heat energy.</span>
4 0
3 years ago
It took 150 joules to lift a rock 1.5 meters into the air. How much force did it take to left the rock?
Semmy [17]

Hi there!

We can use the equation:

\large\boxed{{W = F \cdot d}}

W = Work (J)

F = Force (N)

d = displacement (m)

We can rearrange to solve for force:

\large\boxed{F = \frac{W}{d}}

Plug in the givens:

F =  \frac{150}{1.5} = \boxed{100N}

4 0
1 year ago
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