Physical Science Chapter 3

2.

How many centimeters are there in a stick 3 meters long? (include units)

Explanation
The conversion factor between meters and centimeters is 100cm = 1m. Therefore, to convert 3 meters to centimeters, we multiply 3 by 100, giving us 300 centimeters. Both 300cm and 300 cm are correct representations of the length of the stick in centimeters.

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3.

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jeremy asks his science teacher, Ms. Jackson, a question: "How does adding salt affect the boiling temperature of water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer. What was the control set-up for Jeremy's experiment?

One quart of boiling water with salt added
One quart of boiling water with no salt added
One quart of room temperature water with salt added
One quart of room temperature water with no salt added

Correct Answer

A. One quart of boiling water with no salt added

Explanation

The control set-up for Jeremy's experiment was one quart of boiling water with no salt added. This serves as the baseline or reference point to compare the effects of adding salt to the boiling water. By having a control group without salt, Jeremy can observe and measure the specific changes in the boiling temperature caused by the addition of salt in the other experimental groups.

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4.

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jeremy asks his science teacher, Ms. Jackson, a question: "How does adding salt affect the boiling temperature of water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer Jeremy writes an excellent hypothesis before beginning his experiment. Which of the following is the hypothesis he wrote?

Pasta manufacturers and salt companies have signed a business deal.
Adding salt to pasta water makes the pasta taste better.
Adding salt to pasta water will cause the water to boil at a higher temperature.
Certain types of salts will not dissolve in boiling water.

Correct Answer

A. Adding salt to pasta water will cause the water to boil at a higher temperature.

5.

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jeremy asks his science teacher, Ms. Jackson, a question: "How does adding salt affect the boiling temperature of water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer. The following graph summarizes Jeremy's results. What conclusion can be made from these results?

Adding salt to the water causes the water to boil at a higher temperature.
ADding salt to the water causes the water to boil at a lower temperature.
Adding salt tot he water has no effect on the temperature of the boiling water.
There is not enough information for a valid conclusion.

Correct Answer

A. Adding salt to the water causes the water to boil at a higher temperature.

Explanation

From the graph, it can be observed that as the amount of salt added to the water increases, the boiling temperature of the water also increases. This indicates that adding salt to the water causes the water to boil at a higher temperature. Therefore, the conclusion that can be made from these results is that adding salt to the water causes the water to boil at a higher temperature.

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6.

Listed below are descriptions of the motion of several objects. If they are accelerating place a check.

A car traveling on a turnpike at 60 mph with its cruise control engaged.
A motorcylcle whose brakes have been applied.
A baseball dropped from the roof of a building.
A girl on a skateboard going around a corner at a apeed of 3 m/s
A tractor-trailer parked in a rest area.

Correct Answer(s)

A. A motorcylcle whose brakes have been applied.
A. A baseball dropped from the roof of a building.
A. A girl on a skateboard going around a corner at a apeed of 3 m/s

Explanation

The motorcycle whose brakes have been applied is accelerating because it is experiencing a decrease in velocity. The baseball dropped from the roof of a building is also accelerating due to the force of gravity causing it to increase in velocity as it falls. The girl on a skateboard going around a corner at a speed of 3 m/s is also accelerating because her direction is changing, causing a change in velocity. The car traveling on a turnpike with its cruise control engaged and the tractor-trailer parked in a rest area are not accelerating as their velocities remain constant.

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7.

A woman jogs for 2.0 hours covering a distance of 13 kilometers. What is the speed of the woman expressed in kilometers per hour? ( answer with one decimal place and unit abbreviations) (no spaces)

Correct Answer(s)
6.5km/h

Explanation
The speed of the woman can be calculated by dividing the distance covered by the time taken. In this case, the woman covers a distance of 13 kilometers in 2.0 hours. Dividing 13 by 2 gives us 6.5. Therefore, the speed of the woman is 6.5 kilometers per hour.

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8.

A man runs 1500 meters in 4.00 minutes. What is the speed of the man expressed in meters per second? ( answer with two decimal place and unit abbreviations) (no spaces)

Correct Answer(s)
6.25m/s

Explanation
The speed of an object is calculated by dividing the distance traveled by the time taken. In this case, the man runs a distance of 1500 meters in 4.00 minutes. To convert minutes to seconds, we multiply by 60. So, the time taken is 4.00 minutes * 60 seconds/minute = 240 seconds. Dividing the distance of 1500 meters by the time of 240 seconds gives us a speed of 6.25 meters per second.

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9.

A boy riding a bicycle travels at 10 miles per hour for 3 hours. He stops to rest for one hour and then continues his ride. For the next hour he rides at a speed of 20 miles per hour. During this ride, what was the rider's average speed for the five hour period?( answer unit abbreviations) (no spaces)

Correct Answer(s)
10mph

Explanation
During the first 3 hours, the boy rides at a speed of 10 miles per hour. This means he covers a distance of 10 miles per hour * 3 hours = 30 miles.
Then he stops to rest for 1 hour, so he doesn't cover any distance during this time.
After the rest, he rides for another hour at a speed of 20 miles per hour. So he covers a distance of 20 miles per hour * 1 hour = 20 miles.
In total, he covers a distance of 30 miles + 20 miles = 50 miles in 5 hours.
Therefore, his average speed for the five hour period is 50 miles / 5 hours = 10 miles per hour.

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10.

A carton wieghs 5.00 pounds. If 1.00 newton equals the weight of 0.228 pounds, what is the weight of the carton in units of newtons?( answer with one decimal place and unit abbreviation) (no spaces)

Correct Answer(s)
21.9N

Explanation
The weight of the carton is given in pounds, and we need to convert it to newtons. We are given that 1.00 newton equals the weight of 0.228 pounds. To convert pounds to newtons, we can multiply the weight in pounds by the conversion factor (0.228 pounds/1.00 newton).

Weight in newtons = Weight in pounds * (0.228 pounds/1.00 newton)

Weight in newtons = 5.00 pounds * (0.228 pounds/1.00 newton) = 1.14 newtons

Rounding to one decimal place, the weight of the carton in newtons is 1.1N.

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11.

According to legend, Galileo dropped two balls from the Tower of Pisa to see which would fall faster. Suppose one of the balls had a mass of 5.0 kilograms. Given the acceleration of gravity is 9.8m/sec/sec, what was the weight of the ball in newtons?( answer unit abbreviations) (no spaces)

Correct Answer(s)
49N

Explanation
The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity. In this case, the mass of the ball is given as 5.0 kilograms and the acceleration due to gravity is 9.8 m/s^2. Therefore, the weight of the ball can be calculated as 5.0 kg * 9.8 m/s^2 = 49 N.

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Physical Science Chapter 3

Check all of the metric units.

Quiz Preview

How many centimeters are there in a stick 3 meters long? (include units)

Listed below are descriptions of the motion of several objects. If they are accelerating place a check.

A woman jogs for 2.0 hours covering a distance of 13 kilometers. What is the speed of the woman expressed in kilometers per hour? ( answer with one decimal place and unit abbreviations) (no spaces)

A man runs 1500 meters in 4.00 minutes. What is the speed of the man expressed in meters per second? ( answer with two decimal place and unit abbreviations) (no spaces)

A carton wieghs 5.00 pounds. If 1.00 newton equals the weight of 0.228 pounds, what is the weight of the carton in units of newtons?( answer with one decimal place and unit abbreviation) (no spaces)

According to legend, Galileo dropped two balls from the Tower of Pisa to see which would fall faster. Suppose one of the balls had a mass of 5.0 kilograms. Given the acceleration of gravity is 9.8m/sec/sec, what was the weight of the ball in newtons?( answer unit abbreviations) (no spaces)