If ? = 90° ? ?, what is the value of sin2 ? + sin2 ??
a. 0
b. 1
c. ?1
d. The answer depends on ?.
b
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Projectile Motion: A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the horizontal distance to the point where the football hits the ground if we neglect air resistance?
A. 20 m B. 35 m C. 18 m D. 60 m E. 30.0 m
How can a large asteroid impact in one spot on Earth affect the climate of the entire Earth?
A) The impact releases greenhouse gases that immediately make Earth warmer. B) The impact blasts a hole through Earth's mantle, allowing hot metal from the core to rise up and heat the world. C) The impact blasts debris into Earth's atmosphere that blocks sunlight, making Earth's surface cooler. D) The impact tears a hole in Earth's atmosphere, allowing heat energy to escape and thereby cooling our planet.
The greenhouse effect occurs in the
A) troposphere. B) stratosphere. C) lithosphere.
In a camera, the image focused on the film is
A. real and upright. B. real and inverted. C. virtual and upright. D. virtual and inverted. E. technically a mirage.