# a 20-g bead is attached to a light 120-cm-long string as shown in the figure. this bead moves in a horizontal circle with a constant speed of 1.5 m/s. what is the tension in the string if the angle α is measured to be 25°?

### James

Guys, does anyone know the answer?

get a 20-g bead is attached to a light 120-cm-long string as shown in the figure. this bead moves in a horizontal circle with a constant speed of 1.5 m/s. what is the tension in the string if the angle α is measured to be 25°? from EN Bilgi.

## Solved A 20

Answer to Solved A 20-g bead is attached to a light 120-cm-long string

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## PHYSICS FINAL EXAM Flashcards

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## PHYSICS FINAL EXAM

How many significant figures are in the number 120.070?

A) six B) five C) four D) three

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A. six

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If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?

A) 3.86 m2 B) 3.863 m2 C) 3.864 m2 D) 3.8638 m2 E) 3.86379 m2

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C. 3.864 m2

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### Terms in this set (41)

How many significant figures are in the number 120.070?

A) six B) five C) four D) three A. six

If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?

A) 3.86 m2 B) 3.863 m2 C) 3.864 m2 D) 3.8638 m2 E) 3.86379 m2 C. 3.864 m2

The volume of a 10-mL test tube is equivalent to which one of the following quantities?

A) 0.01 L B) 0.001 kL C) 0.1 L D) 1 × 10-6 L E) 0.001 ML A. 0.01 L

Given that 1.00 in. = 2.54 cm and 1.00 yd = 36.0 in., how many meters are in 7.00 yd?

A) 6.40 m B) 36.3 m C) 640 m D) 1.78 × 103 m A. 6.40m

Leonardo da Vinci's Mona Lisa is 21 in. wide and 30.25 in. tall. What is the area of the painting in square centimeters? (1.00 m = 39.37 in.)

A) 4,100 cm2 B) 1,600 cm2 C) 660 cm2 D) 3,300 cm2 E) 2,400 cm2 A. 4100 cm2

Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?

A) The acceleration is toward the east.

B) Since the car is slowing down, its acceleration must be negative.

C) The acceleration is zero.

D) The acceleration is toward the west.

`A. The acceleration is toward the east

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?

A) On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero.

B) On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero.

C) Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration.

D) The acceleration is downward at all points in the motion.

E) The acceleration is downward at all points in the motion except that is zero at the highest point.

D. The acceleration is downward at all points in the motion.

The slope of a velocity versus time graph gives

A) the distance traveled.

B) velocity. C) acceleration. D) displacement. C. acceleration

The graph in the figure shows the position of a particle as it travels along the x-axis.

At what value of t is the speed of the particle equal to 0 m/s? **pic is on phone or laptop, #9, #1**

A) 0 s B) 1 s C) 2 s D) 3 s E) 4 s D. 4s

If you run a complete loop around an outdoor track of length 400 m in 100 s, find your (a) average velocity and (b) average speed.

(a) 0 m/s (b) 4 m/s

A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?

A) 85 km/h B) 88 km/h C) 90 km/h D) 92 km/h B. 88 km/h

A velocity vector has components 36 m/s westward and 22 m/s northward. What are the magnitude and direction of this vector?

41 m/s at 31 degrees of west

You walk 53 m to the north, then you turn 60° to your right and walk another 45m. Determine the direction of your displacement vector. Express your answer as an angle relative to east.

A) 63° N of E B) 50° N of E C) 57° N of E D) 69° N of E A. 63° N of E

The components of vectors A and B are given as follows:

Ax = 7.6 Bx = -5.1 Ay = -9.2 By = -6.8

What is the magnitude of the vector difference A - A ?

A) 13 B) 3.5 C) 16 D) 170 E) 3.4 A. 13

A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What is the height of the cliff if air resistance is negligibly small?

A) 22 m B) 43 m C) 77 m D) 91 m D. 91 m

A cat leaps to try to catch a bird. If the cat's jump was at 60° off the ground and its initial velocity was 2.74 m/s what is the highest point of its trajectory, neglecting air resistance?

A) 0.29 m B) 0.58 m C) 10.96 m D) 0.19 m A. 0.29 m

A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100 m down range from the base of the building. What was the initial velocity of the ball? Neglect air resistance and use g = 9.81 m/s2.

A) 202 m/s B) 9.80 m/s C) 19.6 m/s D) 45.2 m/s E) 94.4° D. 45.2 m/s

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

## How to calculate the speed of an object attached to a string

Homework Statement The question and the known/given variables are on the image in part 3. The question says that a 20-g bead is attached to a light 120...

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Introductory Physics Homework Help

## How to calculate the speed of an object attached to a string

Thread starter aron silvester Start date Dec 5, 2017 Dec 5, 2017 #1 aron silvester

## Homework Statement

The question and the known/given variables are on the image in part 3. The question says that a 20-g bead is attached to a light 120 cm-long string. Now in my mind the bead will travel in a circular path if it is pushed really hard. So Isn't the length of the string, 120 cm, the radius of the circle? In my work, I had to solve for the radius. I found a solution online and this is their work. The correct answer is 1.1 m/s.

## Homework Equations

It's in part 3 in the image.

## The Attempt at a Solution

https://myhpu-my.sharepoint.com/per...R0RpKa0PGg&e=cf5a0f07109f401fb33a7a681a70fc4a

## Answers and Replies

Dec 5, 2017 #2 mfb Mentor

The bead rotates in 3 D while keeping its height. It is not a typical pendulum. The r in the lower left part of the image is the horizontal separation of the object - the radius of the horizontal motion. It is a bit confusing that the same variable name is used again.

Edit: Picture for future reference:

### Attachments

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Last edited: Dec 5, 2017

Dec 5, 2017 #3 aron silvester mfb said:

The bead rotates in 3 D while keeping its height. It is not a typical pendulum. The r in the lower left part of the image is the horizontal separation of the object - the radius of the horizontal motion. It is a bit confusing that the same variable name is used again.

Wow, it makes so much sense now! Thanks!!!!

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Guys, does anyone know the answer?