In an experiment, students release a pendulum from different heights.
A) A higher release point increases the pendulum's speed.
Question 16
B) Smaller jars contain less oxygen, which is used up faster.
Question 10
B) The battery has run out of charge.
Question 5
D) Upstream water flows downward, increasing the volume of water.
Question 15
B) The temperature suddenly increases.
Question 13
C) The time period will remain unchanged.
Question 18
B) High water content
Question 21
Correct answer: Correct Answer: • Experimental improvement: Use a Newton spring balance to measure the force required to pull an object off the electromagnet in
Question 19
A) Moving the fulcrum closer to the rock
Question 12
B) Condensation
Question 20
B) The pendulum will swing slower.
Question 8
C) The seesaw will tilt toward the other child.
Question 14
C) The sand is carried away by the water.
Which factor will cause the greatest change in a pendulum’s time period?
C) Increasing the length of the string
Question 6
B) Thick, dark clouds forming with increasing wind speed
Question 11
A) The upstream water carries fewer sediments.
Question 22
Correct answer: Correct Answer: • Mass has no effect because gravitational acceleration is the same for all objects regardless of mass
A student builds an electromagnet by wrapping copper wire around an iron nail and connecting it to a battery. She wants to increase its strength. Which of the following will NOT make the electromagnet stronger?
C) Using an aluminum nail instead of iron
Question 17
B) A volcanic eruption is depositing lava that cools and solidifies.
Question 7
A) Measure how much water disappears from an open dish over time.
Question 9
B) Cumulonimbus
Question 4
B) Take a series of photos over a month and compare them.