On the basis of the scientific method, which of the following would be considered conclusive evidence that we are being visited by aliens?
A) an eyewitness account
B) none of these would be conclusive
C) claims of alien abduction made under hypnosis
D) a photograph
B
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The mass of an object is fixed, but its weight varies from location to location
Indicate whether the statement is true or false
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the earth's surface. B) the temperature of the upper atmosphere is higher than it is at the earth's surface. C) the sunlight travels over a longer path at the horizon, resulting in more absorption. D) the atmosphere is more reddish over the ocean.
What are the differences between open star clusters and globular star clusters?
A.) Open clusters are more concentrated, older, and have more stars. B.) Open clusters are less concentrated, older, and have fewer stars. C.) Open clusters are less concentrated, younger, and have more stars. D.) Open clusters are less concentrated, younger, and have fewer stars. E.) Open clusters are more concentrated, younger, and have more stars.
Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance equal to the ball's initial speed
A) multiplied by its time in the air. B) coupled with its speed of fall. C) squared plus its downward speed squared when hitting the floor. D) all of the above E) none of the above