A student wants to test the impact of X-ray radiation on tomato plant growth. Which of the following guidelines should be followed when designing the control group?

An investigation is performed to determine how the angle of a ramp affects the speed of a ball as it rolls down the ramp. In addition to using the same ball and the same ramp, which of these should also remain constant?

A student applied equal forces to 2 carts for the same amount of time. He wants to use line graphs to show that Cart 1 accelerated at a greater rate than Cart 2. Which set of axis labels should the student use to best convey this relationship?

A 6-N force and an 8-N force act at a 90-degree angle to each other on the same object. What is the magnitude of the net force acting on the object?

Franklin wants to know how fast he runs different distances. He uses a stopwatch to measure the time it takes him to complete a 50-meter, 100-meter, and 200-meter race. How can he calculate his speed for each race?

A cart’s initial velocity is 3.0 meters per second. What is its final velocity after accelerating at a rate of 1.5 m/s2 for 8.0 seconds?

A bicycle with an initial velocity of 6.0 m/s accelerates at a rate of 2.0 m/s2 for 3 seconds. What distance does the bicycle travel during this time?

A student wishes to measure the speed of a toy car at the bottom of an inclined plane. Which information is needed to calculate speed?

A heavy round rock and a light marble are simultaneously dropped from the same height. Why would they most likely land at the same time?

A student drops a bowling ball and an apple from a third story window. Both objects hit the ground at the same time. From the experiment the student should conclude that :

When a person parachutes from a plane, she travels at about 67 meters per second. When she pulls her cord and her chute opens, she slows to about 3 meters per second. When her parachute opens, which is happening?

From t = 10.0 seconds to t = 15.0 seconds, a space shuttle increased speed from 57 m/s to 99 m/s. What was the average acceleration of the shuttle?

A car is moving at a constant speed of 16 kilometers per hour (km/h) while traveling in a circle. Why is the velocity of the car changing?

A school bus moves past a parked car at a speed of 30 km/h. Which of the following best describes the observation made by a passenger on the bus?

Traveling in opposite directions, buses A and B pass each other at the speed of 25 km/h, while a passenger on bus A walks toward the back of the bus at the speed of 5 km/h. What is the velocity of the passenger on bus A relative to bus B?

A boat is moving at a speed of 7 m/s relative to the water. A dog walks from the front to the back of the boat at a speed of 2 m/s relative to the boat. What is the speed of the dog, in m/s, relative to the water?

An observer is watching a passenger moving on a moving sidewalk at the airport. The observer knows that the sidewalk is moving at 5 km/h yet the passenger appears to be moving at 12 km/h. Which would best explain what the observer sees?

Galileo designed experiments in which he dropped objects with different masses from the same height. Regardless of the mass, the objects appeared to hit the ground at the same time. What did Galileo discover from these studies?

Near the surface of Earth, all objects have the same rate of acceleration when they fall in a vacuum chamber. Which best explains why objects with different masses will have the same acceleration?

Which of these will reduce the gravitational force between two objects the most?

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