Explain the significance of the center of gravity
What will be an ideal response?
The center of gravity of an object is that point at which the force of gravity can be considered to act. The force of gravity actually acts on all the different parts or particles of an object, but for purposes of determining the translational motion of an object as a whole, it is safe to assume that the entire weight of the object acts at the center of gravity.
You might also like to view...
During a lecture demonstration, a professor places two coins on the edge of a table. She then flicks one of the coins horizontally off the table, simultaneously nudging the other over the edge. Describe the subsequent motion of the two coins, in particular discussing whether they hit the floor at the same time
A. Both coins will hit the ground at the same time because the vertical component of the velocity is exactly the same for both coins. However, the horizontal component of the velocity are the same for the 2 coins, and so, the both coins will hit the ground at the same distance from the table. B. Both coins will hit the ground at the same time because the vertical component of the velocity is exactly the same for both coins. However, the horizontal component of the velocity are different for the 2 coins, and so, the first coin will hit the ground at a farther away distance from the table. C. Both coins will hit the ground at the same time because the horizontal component of the velocity is exactly the same for both coins. However, the vertical component of the velocity are different for the 2 coins, and so, the first coin will hit the ground at the same place as the second coin. D. The two coins will fall at the same rate. The nudged one will fall straight down, whereas the flung one will fall in a half parabola. Both coins though will land at the same time, because when they land is determined by their initial vertical velocity, and both coins had an initial vertical velocity of 0 m/s.
Edward Teller was
A) the discoverer of nuclear fission. B) the head of the program to develop the world's first fusion bomb. C) the inventor of radiation therapy. D) the head of the program to develop the world's first fission bomb. E) the head of the program to develop the world's first nuclear reactor.
A uniform rod is hinged to a wall and held at a 30° angle by a thin string that is attached to the ceiling and makes a 90° angle to rod. Which statement(s) must be true? (At least one of them is true and at least one is false.)
1.The hinge force is purely vertical.
2.The hinge force is purely horizontal.
3.The string tension is equal to the hinge force.
4.The string tension is smaller than the rod's weight.
5.1 and 3 are true.
6.2 and 3 are true.
7.1 and 4 are true.
8.2 and 4 are true.
9.3 and 4 are true.
10.Three of the statements are true.
An object drops in free fall. At one instant it is moving at a speed of 50 meters per second. Exactly one second later its speed is about
1) 10 m/s. 2) 50 m/s. 3) 60 m/s. 4) 100 m/s. This is because 5) no net force acts on the object while in its state of free fall. 6) it gains a speed of about 10 m/s for each second of fall. 7) its velocity nearly doubles each second.