In a certain region of space, a uniform electric field is in the x direction. A particle with negative charge is carried from x = 20.0 cm to x = 60.0 cm. The particle moves to a position where the electric potential is:
1.higher than before.
2.unchanged.
3.lower than before.
4.unpredictable.
3
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An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN, it comes to rest in 3.2 s. What is its mass?
A. 1600 kg B. 12000 kg C. 1100 kg D. 690 kg
The amount of gravitational force that acts on a space vehicle that orbits Earth is
A) nearly zero. B) nearly as much as the vehicle's weight on Earth's surface. C) the same as the vehicle's weight on Earth's surface.
If you shout across a canyon and the echo returns in four seconds, how far away is the other side? (Velocity of sound in air is 300 m/s)
a. 150 b. 300 c. 600 d. 1200 e. 2400 meters
The evidence for present-day global warming include
A) extreme weather—heat waves and droughts. B) melting of Arctic and Antarctic sea ice and continental ice fields and glaciers. C) severe winter storms, and increased downpours and flooding. D) all of the above.