Harbin Warm up #39 2021-2022

Joseph wants to know which brand of fish food will make his goldfish grow the largest. He has 15 goldfish in each of his three 10-gallon tanks. In tank #1 he fed the fish his usual fish food, GrowBig. In the tank #2 he fed the fish Goldfish Goodies fish food. In tank #3 he fed the fish Lets Eat fish food. All three tanks received 10 grams of food per day. After 6 weeks the goldfish who were fed GrowBig had grown an average of 2cm. The fish that ate Goldfish Goodies grew 4cm. The fish that ate Lets Eat fish food grew 1.5cm.

What is the dependent variable in this experiment?

• The size of the tanks

• The type of fish food

• The number of fish

• The length of the fish

A girl became interested in insulation while her parent's house was being built. She decided to determine which insulation was best. She filled each of five mason jars with 200 mL of distilled water. She sealed each jar with the same type of plastic lid. Then she wrapped four jars with a different type of insulation. The fifth jar she did not put any insulation around. She put the jars outside in direct sunlight for eight hours. She then measured and recorded the temperature of the water in each jar. Identify all of the constants in the experiment.

• The type of insulation

• The time in the sun

• The type of water

• The mason jars

• The temperature of the water

Which of the following measurements include metric (S.I.) units?

• 85.8 meters

• 100 miles

• 5.5 gallons

• 273 Kelvin

• 36° Celsius

Where would you have the least mass?

• Mass never changes regardless of location.

• At sea level

• On the space shuttle in outer space

• On top of a very high mountain

Kayla knows that a block of wood has a volume of 30cm³. What tool would she need to use to calculate the density of the block?

• a spring scale

• a metric ruler

• a graduated cylinder

• a balance

Convert 0.726 decaliters to liters.

• 7.26 liters

• 72.6 liters

• 0.00726 liters

• 0.0726 liters

A student is investigating how pea plants grow in different amounts of sunlight. She plants five plants, each in the same type of soil. Each plant receives the same amount of water. She records their growth each week. She places all of her data in a table.

What type of information should she place in the column she has labeled “independent variable”?

• the height of each plant

• the amount of water each plant receives

• the amount of sunlight each plant receives

• the number she assigns to each plant

A student tests the strength of three different brands of batteries by placing each in a flashlight, one at a time, and turning it on. The student measures the how much the voltage of the battery decreases over time and the life of each battery, and graphs the data, as shown.

According to the graph, what is the independent variable in the experiment?

• Life of battery

• Type of flashlight

• Voltage of batteries

• Type of battery