31. Which of the following is not a chemical reaction?
32. the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is same as that of earth and radius is twice as that of earth is . . . . . . . .
33. Why do pendulum checks usually lose time in summer?
34. A bullet is fired directly upwards at a velocity of 196m/s. What maximum height will the gunshot reach? (Suppose that g = 9.8 m/s2)
35. SI unit of universal gravitational constant G is-
36. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth
37. Consider the following statements.
A Simple Pendulum is set into oscillation. Then,
1. the acceleration is zero when the bob passes through the mean position.
2. in each cycle the bob attains a given velocity twice.
3. both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation.
4. the amplitude of oscillation of the simple pendulum decreases with time.
Which of these statements are correct?
A Simple Pendulum is set into oscillation. Then,
1. the acceleration is zero when the bob passes through the mean position.
2. in each cycle the bob attains a given velocity twice.
3. both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation.
4. the amplitude of oscillation of the simple pendulum decreases with time.
Which of these statements are correct?
38. A ball is thrown vertically upwards at a velocity of 20 m/s. What will be the perimeter of displacement after 3 seconds? (g = 10 m/s2)
39. In some region, the gravitational field is zero. The gravitational potential in this region
40. Which of the following statements is/are incorrect?
1. The value of G on the Moon is equal to the value of G on Earth.
2. The gravitational force applied between two objects placed at a distance of 1 meter from each other, whose masses are of 2 kg each, is 26.68 × 10-11 N.
3. Newton's law of gravity is valid only in the laboratory.
4. Force is inversely proportional to the square of the distance between two objects.
1. The value of G on the Moon is equal to the value of G on Earth.
2. The gravitational force applied between two objects placed at a distance of 1 meter from each other, whose masses are of 2 kg each, is 26.68 × 10-11 N.
3. Newton's law of gravity is valid only in the laboratory.
4. Force is inversely proportional to the square of the distance between two objects.
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