Actually, the acceleration of gravity continually increases as the body approaches the earth, air resistance being neglected.
举一反三
- As a block slides down a frictionless incline, which of the following statements is true? A: Both its speed and acceleration increase. B: Its speed and acceleration remain constant. C: Its speed increases and its acceleration remains constant. D: Both its speed and acceleration decrease. E: Its speed increases and its acceleration decreases. F: None of these.
- Which of the following is the most appropriate description of a muscle power grade or strength of three plus (3+)? A: Muscle able to move joint against gravity with full resistance B: Muscle unable to move joint with gravity eliminated C: Muscle unable to overcome resistance other than gravity D: Muscle unable to move joint; palpable contraction of muscle E: Muscle able to move joint against gravity and some resistance
- Tom does not advocate passive endurance in face of injustice. What he advocates is actually ____. A: non-violent resistance B: united resistance C: silent resistance D: violent resistance
- It was in 1665_____the concept of the Earth’s gravity interested Isaac Newton.
- Once out of the earth’s gravity, the astronaut is affected by the problem of ______ (weight).