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2 years ago

List 3 to 5 ways to reduce friction

2 answers:

8 0

<span>Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction
Lubrication is another way to make a surface smoother
Make the object more streamlined
Reduce the forces acting on the surfaces
<span>Reduce the contact between the surfaces.</span></span>

svp [43]2 years ago

5 0

<span>1.Make the surfaces smoother. Rough surfaces produce more friction and 2.smooth surfaces reduce friction.

3.Lubrication is another way to make a surface smoother.

4.Make the object more streamlined

5.Reduce the forces acting on the surfaces.

<span>6.Reduce the contact between the surfaces.

hope this helps ;)</span></span>

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Design an experiment to test the rate at which temperature changes for two different masses (amounts) of water.

mrs_skeptik [129]

Answer:Experimental Question: How does the amount of a substance affect the rate at which temperature changes?

It depends on the conductivity of the material. If the shift is extreme, the temperature near the heating / cooling source will be similar to the temperature of the heating / cooling source and it will take time for the remainder of the material to rise to temperature. It will depend on the conductivity of the material.

Hypothes is:

Materials List:

• digital stopwatch

• 250ml beaker

• rubber bung

• thermometer

• bunsen burner

• tripod

• gauze

• retort stand and clamp

• goggles

Safety Procedures *:

1. Adult supervision is required.

2. Wear safety goggles, apron, and closed-toe shoes.

3. Do not wear baggy sleeves or dangling jewelry. Tie long hair back.

4. Use hot pads or oven mitts to handle hot objects.

5. Do not reach over a hot burner.

6. Do not leave the experiment unattended.

7. Clean up spills immediately.

8. Report any injuries to your Learning Coach or adult supervisor immediately

Experimental Procedures :

• Fill an empty beaker with exactly 150ml of water (check side-scale of beaker)

• Set up apparatus as shown above. Ensure the thermometer is about 2cm above the bottom of the beaker.

• Light the bunsen burner and put on a blue flame. Heat up the water.

• When the temperature on the thermometer has reached 90°C, immediately switch off the burner.

• Start the stopwatch and time for 5.0 minutes.

• Read the thermometer value at the 5.0 minute mark.

• Before repeating the experiment, check the level of water is still 150ml

Data Table:

Start Temperature of Water (°C) Temperature after 5min (°C) Drop in Temperature

(°C) Average Rate of Cooling x 1000 (°C/s)

80 70 10 17

75 66 9 15

70 62 8 13

65 59 6 10

60 55 5 8

Analysis:

Conclusions : There is a strong correlation between the average rate of cooling and the start temperature: the greater the start temperature, the faster the average rate of cooling.

Explanation:

use quillbot or this will be considered plagerism

3 0

2 years ago

Sarah is looking for a way to move her boat across the water without touching it directly. She included paperclips in the boat d

Zigmanuir [339]

Answer:

When there is no detergent in the water, you'll achieve a floating paper clip!

Explanation:

3 0

2 years ago

Read 2 more answers

The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its

Leokris [45]

Its C. 66 cal , that's your answer to your question.

3 0

3 years ago

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How many galaxies similar in size to the milky way would you expect to find, on average, in cubes of that same size? in order to

pishuonlain [190]

The number of galaxies similar in size to the milky way that one can expect to find in cubes of that same size will be 64.

<h3>What is a milky way?</h3>

It should be noted that milky way simply means a spiral galaxy shaped that contains stars.

Here, the number of galaxies similar in size to the milky way that one can expect to find in cubes of that same size will be 64.

Learn more about milky way on:

brainly.com/question/13956361

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2 years ago

Answer the following questions for projectile motion on level ground assuming negligible air resistance (the initial angle being

NikAS [45]

Answer:

Explanation:

a ) The velocity will never be zero . The velocity will be minimum at the highest point of projectile, which will be equal to the horizontal component of the initial velocity.

b ) The velocity will be minimum when its kinetic energy will be minimum . Kinetic energy will be minimum when its potential energy will be maximum.

Its potential energy will be maximum at the highest point so velocity will be minimum at the highest point.

c ) Velocity will never be the same as initial velocity because constant force of gravitation is acting on the projectile all the time.

d ) At the moment when the projectile returns back and hits the ground, the speed becomes equal to the initial speed ( at t = 0 ) because its kinetic energy becomes the same as initial energy , the height becoming zero.

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3 years ago