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4 years ago

What factors cause friction and thermal energy to increase? I need help ASAP!

Physics

1 answer:

VladimirAG [237]4 years ago

6 0

Explanation:

Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

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In lab, your instructor generates a standing wave using a thin string of length L = 1.65 m fixed at both ends. You are told that

mars1129 [50]

Answer:

The maximum transverse speed of the bead is 0.4 m/s

Explanation:

As we know that the Amplitude of the travelling wave is

A = 3.65 mm

Now the speed of the travelling wave is

$v_x = 13.5 m/s$

now we know that distance of first antinode from one end is 27.5 cm

so length of the loop of the standing wave is given as

$\frac{\lambda}{4} = 27.5 cm$

$\lambda = 110 cm$

now we have

$N = \frac{2L}{\lambda}$

$N = \frac{2(1.65)}{1.10}$

$N = 3$

now we have

$R = 2A sin(kx)$

$R = 2(3.65) sin(\frac{2\pi}{1.10}x)$

$R = 7.3 sin(1.82 \pi x)$

now at x = 13.8 cm

$R = 7.3 sin(1.82 \pi (0.138))$

$R = 5.18 mm$

now we have

$f = \frac{v}{\lambda}$

$f = \frac{13.5}{1.1}$

$f = 12.27 Hz$

now maximum speed is given as

$v_y = R\omega$

$v_y = (5.18 \times 10^{-3})(2\pi(12.27))$

$v_y = 0.4 m/s$

4 0

3 years ago

A rescue helicopter lifts a 72.3-kg person straight up by means of a cable. the person has an upward acceleration of 0.571 m/s2

Mademuasel [1]

Answer:A but why don't know???

5 0

3 years ago

When you push down on a block resting on a table, block atoms and table atoms that are in contact with one another

mylen [45]

Maintain their positions.

Solids are incompressible, just like liquids. The electrostatic forces between the atoms of block and the atoms of table prevent the two objects from moving into one another.

5 0

3 years ago

Read 2 more answers

How many hours would it take for a single prokaryote, dividing every 20 minutes by binary fission in a favorable environment, to

butalik [34]

Answer:

$170\frac{2}{3} hrs$

Explanation:

in every 20 minutes the prokaryote divides to produce one of itself .

Mathematically,

20 mins:1 of its kind

x mins :512 of its kind

Where x is the amount of time (in minutes) needed by the prokaryote to produce 512 of its kind.

This implies that,

By cross multiplying we obtain,

$x = 20 \times 512 = 10240mins$

We now convert the time in minutes into hours.

Knowing very well that 60 minutes equals an hour, to convert 10240 minutes to hour we divide by 60.

This implies that,

$10240 \div 60 = 170 \frac{2}{3}$

8 0

3 years ago

-A city and an international airport are 46 km away from each other. A maglev train takes 11

Wittaler [7]

Answer:

Explanation:

Given the following data;

Distance = 46 km

Time = 11 minutes

To find the average speed;

Speed = distance/time

7 0

3 years ago