Which of the following claims can be tested by scientific means?
a. the final thought of Abraham Lincoln were about the fate of his country
b. God exists
c. blue is the best color for walls
d. people born when the sun is in constellation of Leo are more financially successful than other people
Answer: d. people born when the sun is in constellation of Leo are more financially successful than other people
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A horizontal metal bar oriented east-west drops straight down in a location where Earth’s magnetic field is due north. As a result, an emf develops between the ends. Which end is positively charged?
1.the east end 2.the west end 3.neither end carries a current
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in solar system
a) December 17 b)September 3 c) 1 second ago
The exhaust product from a hydrogen fuel cell is
A) carbon dioxide. B) methane. C) pure water. D) nitric acid.
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
after the collision? a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s e. 2.1 m/s